Korir covered the 26.2 mile-course in 2 hours, 12 minutes, 40 seconds to lead a Kenyan sweep to the podium. Levy Matebo was second in 2:13:06 and Bernard Kipyego took third about 7 seconds back of Matebo.
U.S. runner Jason Hartman was fourth at 2:14:31.
Korir and Matebo were well ahead of the rest of the runners with about 3 miles to go and stayed close until the final 2 minutes when Korir pulled away. It wasn't long after that Matebo was looking back to see how close Kipyego was rather than trying to close the distance with Korir.
The winning time was well off the 2:03:02 course record by Geoffrey Mutai last year but this year's race was run in relatively hot weather. The temperature reached 80 degrees by the end of the race.
Kenya also took the top three spots in the women's race.
Sharon Cherop and Jamima Jelagat Sumgong were shoulder to shoulder over much of the closing segments of the race but Cherop kicked out as they rounded the final turn. She built enough of a lead that Sumgong, closing fast, couldn't quite make up.
Cherop finished in 2:31:50 and Sumgong was 2 seconds behind. Georgina Rono was third at 2:33:09.
U.S racer Shirley Reilly won the women's wheelchair section in 1:37:36 and the men's wheelchair winner was Canadian Joshua Cassidy, who was timed in 1:18:25.