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What's the deal with sodium bicarbonate?What if there was a pill, new to the market this year, that was used by more than half of the distance medalists at the 2023 World Athletics Championships? A supplement so in-demand that there was a reported black market for it in Budapest, runners buying from other runners who did not advance past the preliminary round — even though the main ingredient can be found in any kitchen?

How did this pill become so popular? Well, there are rumors that Jakob Ingebrigtsen has been taking it for years — rumors that Ingebrigtsen’s camp and the manufacturers of the pill will neither confirm nor deny.

So about this pill…does it work? Does it actually boost athletic performance? Ask a sports scientist, someone who’s studied it for more than a decade, and they’ll tell you yes.

“There’s probably four or five legal, natural supplements, if you will, that seem to have withstood the test of time in terms of the research literature and [this pill] is one of those,” says Jason Siegler, Director of Human Performance in the College of Health Solutions at Arizona State University.

But there’s a drawback to this pill. It could…well, let’s allow Luis Grijalva, who used it before finishing 4th in the World Championship 5,000m final in Budapest, to explain.

“I heard stories if you do it wrong, you chew it, you kind of shit your brains out,” Grijalva says. “And I was a little bit scared.”

The research supports that, too.

“[Gastrointestinal distress] has by far and away been the biggest hurdle for this supplement,” Siegler says.Okay, enough with the faux intrigue. If you’ve read the subtitle of this article, you know the pill we are talking about is sodium bicarbonate. Specifically, the Maurten Bicarb System, which has been available to the public since February and which has been used by some of the top teams in endurance sports: cycling juggernaut Team Jumbo-Visma and, in running, the On Athletics Club and NN Running Team. (Maurten has sponsorship or partnership agreements with all three).Some of the planet’s fastest runners have used the Maurten Bicarb System in 2023, including 10,000m world champion Joshua Cheptegei, 800m silver medalist Keely Hodgkinson, and 800m silver medalist Emmanuel Wanyonyi. Faith Kipyegon used it before winning the gold medal in the 1500m final in Budapest — but did not use it before her win in the 5,000m final or before any of her world records in the 1500m, mile, and 5,000m.

Herman Reuterswärd, Maurten’s head of communications, declined to share a full client list with LetsRun but claims two-thirds of all medalists from the 800 through 10,000 meters (excluding the steeplechase) used the product at the 2023 Worlds.

After years of trial and error, Maurten believes it has solved the GI issue, but those who have used their product have reported other side effects. Neil Gourley used sodium bicarbonate before almost every race in 2023, and while he had a great season — British champion, personal bests in the 1500 and mile — his head ached after races in a way it never had before. When Joe Klecker tried it at The TEN in March, he felt nauseous and light-headed — but still ran a personal best of 27:07.57. In an episode of the Coffee Club podcast, Klecker’s OAC teammate George Beamish, who finished 5th at Worlds in the steeplechase and used the product in a few races this year, said he felt delusional, dehydrated, and spent after using it before a workout this summer.

“It was the worst I’d felt in a workout [all] year, easily,” Beamish said.

Not every athlete who has used the Maurten Bicarb System has felt side effects. But the sport as a whole is still figuring out what to do about sodium bicarbonate.

Many athletes — even those who don’t have sponsorship arrangements with Maurten — have added it to their routines. But Jumbo-Visma’s top cyclist, Jonas Vingegaard — winner of the last two Tours de France — does not use it. Neither does OAC’s top runner, Yared Nuguse, who tried it a few times in practice but did not use it before any of his four American record races in 2023.“I’m very low-maintenance and I think my body’s the same,” Nuguse says. “So when I tried to do that, it was kind of like, Whoa, what is this? My whole body felt weird and I was just like, I either did this wrong or this is not for me.”

How sodium bicarbonate works

The idea that sodium bicarbonate — aka baking soda, the same stuff that goes in muffins and keeps your refrigerator fresh — can boost athletic performance has been around for decades.

“When you’re exercising, when you’re contracting muscle at a really high intensity or a high rate, you end up using your anaerobic energy sources and those non-oxygen pathways,” says Siegler, who has been part of more than 15 studies on sodium bicarbonate use in sport. “And those pathways, some of the byproducts that they produce, one of them is a proton – a little hydrogen ion. And that proton can cause all sorts of problems in the muscle. You can equate that to that sort of burn that you feel going at high rates. That burn, most of that — not directly, but indirectly — is coming from the accumulation of these little hydrogen ions.”

As this is happening, the kidneys produce bicarbonate as a defense mechanism. For a while, bicarbonate acts as a buffer, countering the negative effects of the hydrogen ions. But eventually, the hydrogen ions win.The typical concentration of bicarbonate in most people hovers around 25 millimoles per liter. By taking sodium bicarbonate in the proper dosage before exercise, Siegler says, you can raise that level to around 30-32 millimoles per liter.

“You basically have a more solid first line of defense,” Siegler says. “The theory is you can go a little bit longer and tolerate the hydrogen ions coming out of the cell a little bit longer before they cause any sort of disruption.”

Like creatine and caffeine, Siegler says the scientific literature is clear when it comes to sodium bicarbonate: it boosts performance, specifically during events that involve short bursts of anaerobic activity. But there’s a catch.

***

Bicarb without the cramping

Sodium bicarbonate has never been hard to find. Anyone can swallow a spoonful or two of baking soda with some water, though it’s not the most appetizing pre-workout snack. The problem comes when the stomach tries to absorb a large amount of sodium bicarbonate at once.

“You have a huge charged load in your stomach that the acidity in your stomach has to deal with and you have a big shift in the partial pressure of carbon dioxide across the gut,” Siegler says. “And that’s what gives you the cramping.”

A few years ago, Maurten was trying to solve a similar problem for marathoners trying to ingest large amounts of carbohydrates during races. The result was their carbohydrate drink, which relies on something called a hydrogel to form in the stomach. The hydrogel resists the acidity of the stomach and allows the carbohydrates to be absorbed in the intestine instead, where there is less cramping.

“We thought, okay, we are able to solve that one,” Reuterswärd says. “Could we apply the hydrogel technology to something else that is really risky to consume that could be beneficial?”

For almost four years, Maurten researched the effects of encapsulating sodium bicarbonate in hydrogels in its Swedish lab, conducting tests on middle-distance runners in Gothenburg. Hydrogels seemed to minimize the risk, but the best results came when hydrogels were paired with microtablets of sodium bicarbonate.

The result was the Maurten Bicarb System — “system,” because the process for ingesting it involves a few steps. Each box contains three components: a packet of hydrogel powder, a packet of tiny sodium bicarbonate tablets, and a mixing bowl. Mix the powder with water, let it stand for a few minutes, and sprinkle in the bicarb.The resulting mixture is a bit odd. It’s gooey. It’s gray. It doesn’t really taste like anything. It’s not quite liquid, not quite solid — a yogurt-like substance flooded with tiny tablets that you eat with a spoon but swallow like a drink.

The “swallow” part is important. Chew the tablets and the sodium bicarbonate will be absorbed before the hydrogels can do their job. Which means a trip to the toilet may not be far behind.

When Maurten launched its Bicarb System to the public in February 2023, it did not have high expectations for sales in year one.

“It’s a niche product,” Reuterswärd says. “From what we know right now, it maybe doesn’t make too much sense if you’re an amateur, if you’re just doing 5k parkruns.” 

But in March, Maurten’s product began making headlines in cycling when it emerged that it was being used by Team Jumbo-Visma, including by stars Wout van Aert and Primož Roglič. Sales exploded. Because bicarb dosage varies with bodyweight, Maurten’s system come in four “sizes.” And one size was selling particularly well.

“If you’re an endurance athlete, you’re around 60-70 kg (132-154 lbs),” Reuterswärd says. “We had a shortage with the size that corresponded with that weight…The first couple weeks, it was basically only professional cyclists buying all the time, massive amounts. And now we’re seeing a similar development in track & field.”

If there was a “Jumbo-Visma” effect in cycling, then this summer there was a “Jakob Ingebrigtsen” effect in running.To be clear: there is no official confirmation that Ingebrigtsen uses sodium bicarbonate. His agent, Daniel Wessfeldt, did not respond to multiple emails for this story. When I ask Reuterswärd if Ingebrigtsen has used Maurten’s product, he grows uncomfortable.

“I would love to be very clear here but I will have to get back to you,” Reuterswärd says (ultimately, he was not able to provide further clarification).

But when Maurten pitches coaches and athletes on its product, they have used data from the past two years on a “really good” 1500 guy to tout its effectiveness, displaying the lactate levels the athlete was able to achieve in practice with and without the use of the Maurten Bicarb System. That athlete is widely believed to be Ingebrigtsen. Just as Ingebrigtsen’s success with double threshold has spawned imitators across the globe, so too has his rumored use of sodium bicarbonate.

Grijalva says he started experimenting with sodium bicarbonate “because everybody’s doing it.” And everybody’s doing it because of Ingebrigtsen.

“[Ingebrigtsen] was probably ahead of everybody at the time,” Grijalva said. “Same with his training and same with the bicarb.”

OAC coach Dathan Ritzenhein took sodium bicarbonate once before a workout early in his own professional career, and still has bad memories of swallowing enormous capsules that made him feel sick. Still, he was willing to give it a try with his athletes this year after Maurten explained the steps they had taken to reduce GI distress.

“Certainly listening to the potential for less side effects was the reason we considered trying it,” says Ritzenhein. “I don’t know who is a diehard user and thinks that it’s really helpful, but around the circuit I know a lot of people that have said they’ve [tried] it.”

Coach/agent Stephen Haas says a number of his athletes, including Gourley, 3:56 1500 woman Katie Snowden, and Worlds steeple qualifier Isaac Updike, tried bicarb this year. In the men’s 1500, Haas adds, “most of the top guys are already using it.”

Yet 1500-meter world champion Josh Kerr was not among them. Kerr’s nutritionist mentioned the idea of sodium bicarbonate to him this summer but Kerr chose to table any discussions until after the season. He says he did not like the idea of trying it as a “quick fix” in the middle of the year.

“I review everything at the end of the season and see where I could get better,” Kerr writes in a text to LetsRun. “As long as the supplement is above board, got all the stamps of approvals needed from WADA and the research is there, I have nothing against it but I don’t like changing things midseason.”

***

So does it actually work?

Siegler is convinced sodium bicarbonate can benefit athletic performance if the GI issues can be solved. Originally, those benefits seemed confined to shorter events in the 2-to 5-minute range where an athlete is pushing anaerobic capacity. Buffering protons does no good to short sprinters, who use a different energy system during races.

“A 100-meter runner is going to use a system that’s referred to the phosphagen or creatine phosphate system, this immediate energy source,” Siegler says. “…It’s not the same sort of biochemical reaction that eventuates into this big proton or big acidic load. It’s too quick.”

But, Siegler says, sodium bicarbonate could potentially help athletes in longer events — perhaps a hilly marathon.

“When there’s short bursts of high-intensity activity, like a breakaway or a hill climb, what we do know now is when you take sodium bicarbonate…it will sit in your system for a number of hours,” Siegler says. “So it’s there [if] you need it, that’s kind of the premise behind it basically. If you don’t use it, it’s fine, it’s not detrimental. Eventually your kidneys clear it out.”Even Reuterswärd admits that it’s still unclear how much sodium bicarbonate helps in a marathon — “honestly, no one knows” — but it is starting to be used there as well. Kenya’s Kelvin Kiptum used it when he set the world record of 2:00:35at last month’s Chicago Marathon; American Molly Seidel also used it in Chicago, where she ran a personal best of 2:23:07.

 

Siegler says it is encouraging that Maurten has tried to solve the GI problem and that any success they experience could spur other companies to research an even more effective delivery system (currently the main alternative is Amp Human’s PR Lotion, a sodium bicarbonate cream that is rubbed into the skin). But he is waiting for more data before rendering a final verdict on the Maurten Bicarb System.

“I haven’t seen any peer-reviewed papers yet come out so a bit I’m hesitant to be definitive about it,” Siegler said.

Trent Stellingwerff, an exercise physiologist and running coach at the Canadian Sport Institute – Pacific, worked with Siegler on a 2020 paper studying the effect of sodium bicarbonate on elite rowers. A number of athletes have asked him about the the Maurten Bicarb System, and some of his marathoners have used the product. Like Siegler, he wants to see more data before reaching a conclusion.

“I always follow the evidence and science, and to my knowledge, as of yet, I’m unaware of any publications using the Maurten bicarb in a double-blind, placebo-controlled clinical trial,” Stellingwerff writes in a text to LetsRun. “So without any published data on the bicarb version, I can’t really say it does much.”

The closest thing out there right now is a British study conducted by Lewis Goughof Birmingham City University and Andy Sparks of Edge Hill University. In a test of 10 well-trained cyclists, Gough and Sparks found the Maurten Bicarb System limited GI distress and had the potential to improve exercise performance. Reuterswärd says the study, which was funded by Maurten, is currently in the review process while Gough and Sparks suggested further research to investigate their findings.

What about the runners who used sodium bicarbonate in 2023?

Klecker decided to give bicarb a shot after Maurten made a presentation to the OAC team in Boulder earlier this year. He has run well using bicarb (his 10,000 pb at The TEN) and without it (his 5,000 pb in January) and as Klecker heads into an Olympic year, he is still deciding whether the supposed benefits are worth the drawbacks, which for him include nausea and thirst. He also says that when he has taken the bicarb, his muscles feel a bit more numb than usual, which has made it more challenging for him to gauge his effort in races.

“There’s been no, Oh man I felt just so amazing today because of this bicarb,” Klecker says. “If anything, it’s been like, Oh I didn’t take it and I felt a bit more like myself.”

Klecker also notes that his wife and OAC teammate, Sage Hurta-Klecker, ran her 800m season’s best of 1:58.09 at the Silesia Diamond League on July 16 — the first race of the season in which she did not use bicarb beforehand.

A number of athletes in Mike Smith‘s Flagstaff-based training group also used bicarb this year, including Grijalva and US 5,000 champion Abdihamid Nur. Grijalva did not use bicarb in his outdoor season opener in Florence on June 2, when he ran his personal best of 12:52.97 to finish 3rd. He did use it before the Zurich Diamond League on August 31, when he ran 12:55.88 to finish 4th.“I want to say it helps, but at the same time, I don’t want to rely on it,” Grijalva says.

Almost every OAC athlete tried sodium bicarbonate at some point in 2023. Ritzenhein says the results were mixed. Some of his runners have run well while using it, but the team’s top performer, Nuguse, never used it in a race. Ritzenhein wants to continue testing sodium bicarbonate with his athletes to determine how each of them responds individually and whether it’s worth using moving forward.

That group includes Alicia Monson, who experimented with bicarb in 2023 but did not use it before her American records at 5,000 and 10,000 meters or her 5th-place finish in the 10,000 at Worlds.

“It’s not the thing that’s going to make or break an athlete,” Ritzenhein says. “…It’s a legal supplement that has the potential, at least, to help but it doesn’t seem to be universal. So I think there’s a lot more research that needs to be done into it and who benefits from it.”

The kind of research scientists like Stellingwerff want to see — double-blind, controlled clinical trials — could take a while to trickle in. But now that anyone can order Maurten’s product (it’s not cheap — $65 for four servings), athletes will get to decide for themselves whether sodium bicarbonate is worth pursuing.

“The athlete community, obviously if they feel there’s any sort of risk, they’re weighing up the risk-to-benefit ratio,” Siegler said. “The return has got to be good.”

Grijalva expects sodium bicarbonate will become part of his pre-race routine next year, along with a shower and a cup of coffee. Coffee, and the caffeine contained wherein, may offer a glimpse at the future of bicarb. Caffeine has been widely used by athletes for longer than sodium bicarbonate, and the verdict is in on that one: it works. Yet plenty of the greats choose not to use it.

Nuguse is among them. He does not drink coffee — a fact he is constantly reminded of by Ritzenhein.

“I make jokes almost every day about it,” Ritzenhein says. “His family is Ethiopian – coffee tradition and ceremony is really important to them.”

Ritzenhein says he would love it if Nuguse drank a cup of coffee sometime, but he’s not going to force it on him. Some athletes, Ritzenhein says, have a tendency to become neurotic about these sorts of things. That’s how Ritzenhein was as an athlete. It’s certainly how Ritzenhein’s former coach at the Nike Oregon Project, Alberto Salazar, was — an approach that ultimately earned Salazar a four-year ban from USADA.

Ritzenhein says he has no worries when it comes to any of his athletes using sodium bicarbonate — Maurten’s product is batch-tested and unlike L-carnitine, there is no specific protocol that must be adhered to in order for athletes to use it legally under the WADA Code. Still, there is something to be said for keeping things simple.

“Yared knows how his body feels,” Ritzenhein says. “…He literally rolls out of practice and comes to practice like a high schooler with a Eggo waffle in hand. Probably more athletes could use that kind of [approach].”

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Ethiopia’s Fotyеn Tesfay Haylu delivered one of the most remarkable women’s half-marathon performances ever seen on American soil on Sunday, powering to a commanding victory at the 2026 Buenos Aires Half Marathon in Argentina in 1:03:57.

Running with exceptional confidence and strength, Tesfay took control of the race and produced a superb solo performance to rewrite the event record. Her breathtaking run also carried historic significance, as she became the first woman to break the 64-minute barrier for the half marathon in the Americas, producing what is being celebrated as the fastest women’s half-marathon performance ever recorded on the continent.

The Ethiopian star was in a class of her own, crossing the finish line more than a minute clear of Turkey’s Nevin Can, who finished second in 1:05:06. Another Turkish athlete, Selin Can, completed the podium in third place with 1:05:11, as the leading trio all produced strong performances on the fast streets of Buenos Aires.

Kenya also featured prominently in the top positions, with Irene Jepchumba Kimais taking fourth in 1:06:04, followed by Sheila Chepkirui in fifth with 1:06:13. Magaret Akidor Ngathike finished sixth in 1:06:46, while fellow Kenyan Deborah Samum claimed seventh place in 1:08:32.

Brazil’s Nubia de Oliveira Silva was eighth in 1:11:13, while Argentina’s Sofia Luna and Dahyana Juarez rounded out the top 10 with times of 1:11:21 and 1:11:28, respectively.

Top 10 Women – 2026 Buenos Aires Half Marathon

1. Fotyеn Tesfay Haylu (Ethiopia) – 1:03:57

2. Nevin Can (Turkey) – 1:05:06

3. Selin Can (Turkey) – 1:05:11

4. Irene Jepchumba Kimais (Kenya) – 1:06:04

5. Sheila Chepkirui (Kenya) – 1:06:13

6. Magaret Akidor Ngathike (Kenya) – 1:06:46

7. Deborah Samum (Kenya) – 1:08:32

8. Nubia de Oliveira Silva (Brazil) – 1:11:13

9. Sofia Luna (Argentina) – 1:11:21

10. Dahyana Juarez (Argentina) – 1:11:28

For Tesfay, it was far more than a race victory. Her 1:03:57 performance was a statement of extraordinary quality, combining speed, endurance and remarkable solo running to produce a landmark result in Buenos Aires. In a race that will be remembered for years to come, the Ethiopian did not simply win—she redefined what was thought possible for women’s half-marathon running in the Americas.

Ethiopia’s Yomif Kejelcha produced one of the most extraordinary performances in road racing history on the streets of Buenos Aires, Argentina, reclaiming the half marathon world record with a sensational 56:51 performance at the 2026 Buenos Aires Half Marathon.

The former world record-holder delivered a breathtaking exhibition of speed and endurance to take 29 seconds off the previous pending mark of 57:20, set by Uganda’s Jacob Kiplimo and takes a huge chunk from his own former official world record. Kejelcha's new performance is pending the standard ratification procedures, but if officially ratified, it will return the world record to the Ethiopian star and mark another remarkable chapter in the evolution of the event. 

Kejelcha's achievement is particularly significant because the 57-minute barrier had already been broken before. Jacob Kiplimo had previously run under 57 minutes, clocking 56:42 that was not ratified demonstrating that the once-unthinkable barrier was possible. Kejelcha, however, has become the second man to run under 57-minute barrier who now returns to the top of the all-time rankings with another historic performance in Buenos Aires.

The Ethiopian's race was remarkable not only for the final time but also for the way he built his performance. He covered the opening five kilometres in 13:44 before reaching 10km in 27:18. Rather than slowing, Kejelcha accelerated through the middle stages, passing 15km in 40:39 and 20km in 54:02 as he continued to push the limits of elite road racing.

By the time he reached the finish line, Kejelcha had completed the race at an extraordinary average pace of approximately 2:42 per kilometre, producing one of the most astonishing sustained efforts ever witnessed in distance running. His stunning run sent a powerful message to the athletics world and further strengthened his status as one of the most formidable distance runners of his generation.

Behind the record-breaking champion, Ethiopia completed a dominant clean sweep of the men's podium. Tadese Worku Gebresilase claimed second place in 59:18, while Bereket Nega Batebo secured third in 1:00:17, giving Ethiopia a memorable one-two-three finish in the Argentine capital.

Kenya’s Jonathan Kipkoech Kamosong finished fourth in 1:00:20, followed by compatriot Simon Maywa in fifth with 1:00:55. Argentina’s Ignacio Erario gave the home supporters plenty to celebrate with an impressive sixth-place finish in 1:00:57, breaking the one-hour barrier in front of an enthusiastic local crowd.

Dillon Kipyeko of Kenya finished seventh in 1:01:07, with Robert Kiprop Koech eighth in 1:02:01. Mexico’s Julio Ortiz Ponce took ninth place in 1:03:17, while Colombia’s Jimmy Gómez completed the top 10 in 1:03:34.

The Buenos Aires Half Marathon will now take its place in the history books as the scene of a truly extraordinary breakthrough. For Kejelcha, this was more than just another victory. It was a spectacular return to the top, reclaiming a world record he had previously held and once again rewriting the limits of the half marathon.

The 56:51 performance remains pending ratification, but Yomif Kejelcha's run has already delivered one of the defining moments in the history of road racing.

Kenya delivered another commanding display of distance-running excellence at the Antrim Coast Half Marathon, with Isaia Lasoi leading a memorable Kenyan clean sweep of the men's podium in a race packed with world-class performances.

Lasoi emerged victorious after a thrilling battle at the front, crossing the finish line in a superb 58:26 setting a new course record. His winning performance underlined his strength and speed over the half-marathon distance, but he was made to work all the way by fellow Kenyan Daniel Mateiko, who finished just three seconds behind in 58:29 after an electrifying duel for the title.

The contest between the two leaders produced one of the standout moments of the race, with both athletes pushing deep into elite territory as they fought for victory. In the end, Lasoi found just enough to secure the win, while Mateiko's narrow defeat highlighted the remarkable depth and quality of Kenya's leading distance runners.

Vincent Kipkorir completed the Kenyan sweep, taking third place in 1:00:38 to ensure that all three places on the podium belonged to Kenyan athletes. Samwel Chebolei added further Kenyan strength to the results, finishing fourth in 1:01:01, while Amos Langat was also among the leading finishers.

The international field featured several prominent names. Australia's Jimmy Whelan produced a strong run, while Ethiopia's Yismaw Dillu featured among the front group. American marathon star Galen Rupp also delivered a notable performance, clocking 1:01:29 in another competitive outing for the experienced distance runner. Former world-class track and road athlete Edward Cheserek was also among the top finishers.

Lasoi's 58:26 victory, however, was the defining performance of the day. Together with Mateiko and Kipkorir, he gave Kenya a perfect podium and another emphatic reminder of the country's extraordinary strength in elite road running.

The Antrim Coast Half Marathon once again provided a fast, competitive stage for some of the world's finest distance runners, but when the decisive moments arrived, it was Kenya that owned the podium.

One of the most iconic milestones in the history of ultramarathon running is drawing closer, with entries for the historic 100th edition of the Comrades Marathon set to open on Tuesday, 25 August 2026.

The Comrades Marathon Association has officially announced a detailed entry process for the 2027 race, which will unfold in three stages and give runners around the world the opportunity to secure their place in what promises to be one of the most significant editions ever held of The Ultimate Human Race.

The announcement followed the official launch of the 2027 Comrades Marathon on Wednesday, 19 August, when the centenary campaign, “The Greatest Story Ever Run,” was unveiled alongside a special logo created exclusively for the landmark 100th edition.

The launch also revealed several major highlights for the Centenary Race. The historic event will take place on Sunday, 13 June 2027, and will be a Down Run, with 28,000 places available. The entry process will include a ballot, while the race will offer a record R8.919 million in prize money. Organisers have also set an ambitious goal of raising R10 million for the Amabeadibeadi charities, adding an important charitable dimension to the centenary celebrations. One of the defining moments of the launch was the unveiling of the special Centenary mark, created to commemorate this extraordinary milestone in the history of the race.

The entry process begins on 25 August at 10:00 a.m. SAST, when entries open for Green Number runners, Yellow Number runners and Amabeadibeadi charity entrants.

The next phase follows on 2 September at 10:00 a.m. SAST, when entries open for Comrades Marathon Association members. This window will remain open for 72 hours or until the available entry allocation is filled, with places offered on a strictly first-come, first-served basis.

For general entrants, the process will move to a ballot system. General entries open on 9 September at 10:00 a.m. SAST, with runners able to enter the ballot until it closes on 22 September at 4:30 p.m. SAST. The ballot draw is then scheduled to take place on 23 September.

Several other crucial dates will shape the road to the historic race. The substitution period will run from 15 to 31 March 2027, while 3 May 2027 is the final deadline for runners to submit their qualifying performances, seeding information and other required entry details.

To qualify for the 2027 Comrades Marathon, runners must complete a 42.2km marathon in under five hours between 15 June 2026 and 3 May 2027.

The journey will finally culminate on Sunday, 13 June 2027, when thousands of runners are expected to line up for the historic 100th edition of the Comrades Marathon.

The 2027 race will represent a remarkable moment for the legendary South African ultramarathon. For more than a century, the Comrades Marathon has captured the imagination of runners and spectators with its extraordinary test of endurance, determination and human spirit. Its centenary edition will celebrate the generations of athletes who have faced its demanding roads, conquered its challenges and helped build one of the world's most respected endurance events.

For runners dreaming of becoming part of this historic occasion, the road to Comrades 2027 is now clearly marked. From the opening of entries in August 2026 to race day in June 2027, every deadline will matter.

The Greatest Story Ever Run is preparing for its most historic chapter yet.

American sprint standout Sam Blaskowski is taking steps toward an international future with Poland after uncovering a powerful connection to his family's ancestral homeland.

The 23-year-old sprinter, who has established himself as one of the fastest Americans of his generation with a personal best of 9.89 seconds in the 100 metres, has begun the process of obtaining Polish citizenship with the aim of eventually representing Poland in international competition.

Blaskowski's connection to the country traces back through his great-grandparents, Franciszek and Julian Błaszkowski, who emigrated from Poland to the United States in 1905. Their journey more than a century ago has now opened an unexpected new chapter for their descendant, whose athletic ambitions could soon carry the Błaszkowski name back onto the international stage under Polish colours.

The sprinter has already received support from the Polish Athletics Association as he works through the citizenship and eligibility process. Should his transfer of allegiance be completed, Blaskowski could become a significant addition to Poland's sprint programme.

His credentials certainly make the prospect an exciting one. In addition to his sub-10-second speed over 100 metres, Blaskowski owns a personal best of 19.93 seconds in the 200 metres, demonstrating the kind of versatility that could prove valuable both individually and in Poland's 4x100m relay squad.

For Blaskowski, however, the move is about more than simply changing national colours. It represents an opportunity to reconnect with his family's heritage while pursuing his ambitions at the highest level of the sport.

With his sights set on becoming part of Poland's international sprint team and competing for relay medals, Blaskowski's journey from discovering his Polish roots to potentially representing the country of his ancestors could become one of the most fascinating allegiance stories in world athletics.

A century after Franciszek and Julian Błaszkowski left Poland for America, their family's story may now be coming full circle—this time at full sprint.