Kenyan Wesley Korir has won the Boston Marathon in two hours 12 minutes and 40 seconds.
In a Kenyan sweep of the podium, Levy Matebo came in second and Bernard Kipyego was third on a day when soaring temperatures kept times slow.
Korir's time was almost 10 minutes slower than the world's best pace set last year by Geoffrey Mutai, another Kenyan, who dropped out of the race at the 30-kilometer mark due to cramps.
Sharon Cherup of Kenya won the women's race in an unofficial time of two hours, 31 minutes, 50 seconds.
Compatriot Jemima Sumgong finished second after Cherup surged with about 600 meters to go, and Kenyan Georgina Rono was third.