Joshua Cheptegei will contest the marathon for the first time on Sunday, when the two-time Olympic 10,000m champion lines up for the 2026 TCS London Marathon alongside his compatriot and training partner Jacob Kiplimo. Cheptegei's 2:04:52 debut at the 2024 Valencia Marathon was widely read as a learning exercise, and since then he has returned to the track and raced only sparingly on the roads. His Wednesday afternoon appearance at the elite press conference at the Tower Hotel confirmed what Ugandan media had reported earlier in the week: the 29-year-old is fully fit, has moved training to a higher-volume block under his long-time coach Addy Ruiter, and considers a top-three finish on The Mall the minimum requirement for what he is calling his "proper" marathon debut.
Cheptegei's arrival on the Abbott World Marathon Majors circuit has been heavily anticipated since he first floated the idea of moving to 26.2 in early 2022. His track record reads like an audit of what an aerobic engine can do: world records in the 5,000m on the track (12:35.36, Monaco 2020), the 10,000m (26:11.00, Valencia 2020) and the road 15K (41:05, Nijmegen 2018, since ratified downwards by several seconds). At the 2024 Paris Olympics he retained the 10,000m gold he first won in Tokyo in 2021 and took silver in the 5,000m behind Norway's Jakob Ingebrigtsen. The Valencia marathon debut that December, in which he finished fifth, drew more attention for its honest debrief than its time: Cheptegei said immediately afterwards that he had misjudged fuelling and fluid intake in the final 10 kilometres, and promised he would go back "with the head of a marathoner, not a 10,000m runner" when he raced again.
That marathon re-education has taken place, for the most part, in the hills around Kapchorwa and on the altitude tracks at Iten in western Kenya, where Cheptegei and Kiplimo share a training base with several other Ugandan distance runners. Kiplimo, who finished second behind Sebastian Sawe in 2:03:37 on his own London debut last year, told reporters on Tuesday that the pair had completed at least six marathon-paced long runs of 35 kilometres or longer in the build-up, with Cheptegei pacing Kiplimo through Kiplimo's own half-marathon work in mid-March. Cheptegei's marathon PB of 2:04:52 is comfortably the slowest in the men's elite field on Sunday — Kiplimo, Sawe, Kejelcha and Tola all hold bests under 2:03:30 — but his training partners have briefed the Ugandan federation that he has been running faster in practice than the 2:02 camp pacing.
Sunday's course sets up well for a rapid debut. The 2026 Men's elite race will target a 61:00 first half — a minute inside the opening split that took Kelvin Kiptum to his 2:01:25 course record in 2023 — with weather forecasts pointing to light westerly winds and start temperatures around 10°C, almost identical conditions to those enjoyed at Valencia in December 2024. Sawe has already told reporters that he expects whoever wins to have to break Kiptum's course record. Kiplimo, when asked whether his compatriot could push into a sub-2:03 debut, replied that "a 2:02 is very possible for Joshua if he stays with the group to 35K; I have seen him do the sessions." Both Ugandans are racing in adidas Adizero Adios Pro Evo 2 super-shoes under their new federation-wide deal with the German brand.
For the Ugandan federation, whose road presence has historically been thinner than its track record, Sunday represents a potential turning point. If both Cheptegei and Kiplimo finish on the podium, Uganda will have two marathoners inside 2:03 for the first time, positioning the country as a genuine third force alongside Kenya and Ethiopia in men's marathon racing. Cheptegei himself has been careful to frame Sunday as a stepping-stone rather than a destination; the Ugandan federation has already applied to the Berlin Marathon for a September start for him if Sunday goes well, and Cheptegei has told local media he intends to contest both the 2028 Los Angeles Olympic marathon and the 2028 Olympic 10,000m. "London will tell me what shape I am in," he said on Wednesday. "Then I will decide what I can do next."