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Kenya's Benson Kipruto won the men's race and Diana Kipyogei led a Kenyan sweep of the women's podium at the Boston Marathon on Monday, each picking up their first-ever major title.
But Marcel Hug, the men's wheelchair champion, took a wrong turn on Monday which he estimated cost him the $US50,000 ($A67,845) bonus on offer for breaking his own course record.
In the men's race American CJ Albertson set an aggressive early pace to lead the field by two minutes and 13 seconds through the first half, but saw his head start disintegrate over hilly terrain after the 30km mark, as a tight pack overtook him.
Kipruto, who won the Prague Marathon in May, pulled away with less than 10km to go and had secured a commanding lead heading into the closing stages, absorbing the cheers along Boylston Street as he broke the tape in two hours, nine minutes and 51 seconds.
Ethiopians Lemi Berhanu and Jemal Yimer finished second and third, respectively.
In the women's race, a crowded pack stuck together through the first 25km before Kipyogei, who won the Istanbul Marathon in 2020, made her move, securing a 10-second lead over the rest of the field by the 30km mark.
Ethiopia's Netsanet Gudeta quickly challenged her but Kipyogei proved too powerful, again pulling away to win the race in 2:24:45.
Edna Kiplagat, who won in 2017, and Mary Ngugi finished second and third, respectively, to complete a podium sweep for Kenya.
Swiss athletes won the men's and women's wheelchair events, with Paralympic champion Hug picking up his fifth title in Boston in 1:18:11 despite missing a turn in the final moments of the race.
He set the course record of 1:18:04 in 2017.
"I would say it cost me 20 seconds and it should have been possible to get the record, for sure," he said.
"It should not have happened. It's my fault. I was just focusing on my performance. I didn't think about that. It's sad, but it happens."
Manuela Schar picked up her third Boston Marathon win in 1:35:21.
Temperatures hovered around 15.6degC as the professional men's and women's groups took off from Hopkinton, Massachusetts, under humid conditions for the 125th running of the world's oldest annual marathon.
Organisers pushed the race back from its usual April date due to the Covid-19 pandemic and made other adjustments to the race, including capping participation to 20,000 entrants and requiring either a Covid-19 vaccine or proof of a negative test.
The change in date made for a tight autumn racing schedule, with the London Marathon pushed back from its usual April running to October 3 and the Chicago Marathon moving forward as planned to October 10.
The race was cancelled in 2020 due to the pandemic.