Wesley Korir won the Boston Marathon on Monday in a heat-slowed unofficial time of 2 hours, 12 minutes, 40 seconds.

A year after Geoffrey Mutai ran the fastest marathon in history to win here, Korir won the second-slowest Boston race since 1985. Mutai dropped out after 29 kilometers (18 miles) with cramps as temperatures rose into the 80s on the 42.2-kilometer (26.2-mile) trek from Hopkinton to Copley Square.

Sharon Cherop won the women's race to complete the Kenyan sweep, outsprinting fellow Kenyan Jemima Jelagat Sumgong to win in an unofficial 2 hours, 31 minutes, 50 seconds.

It was the fifth consecutive year that the women's race came down to a sprint down Boylston Street.

Korir is the 19th Kenyan men's winner in 22 years.