BOSTON (CBS) – Kenya’s Wesley Korir fended off challenges from the heat and fellow countryman Levy Matebo to win the 2012 Boston Marathon Monday in  2 hours 12 minutes and 40 seconds.

Last year’s champion Geoffrey Mutai dropped out with cramps near the 18-mile mark in the high temperatures, which hit the 80′s on the course.

Korir’s win was the second-slowest in Boston since 1985, but it was still good enough to bring home the $150,000 winner’s prize.

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He’s the 19th man from Kenya to win the Boston Marathon in 22 years.

The top American was Jason Hartmann of Boulder, Colorado, who finished in fourth place in 2:14:31.