Kenya's Robert Kiprono Cheruiyot won the men's race at Boston Marathon in course record time.
Cheruiyot won this time in an unofficial time of 2 hours, 5 minutes, 52 seconds, finishing 91 seconds ahead of Ethiopian Tekeste Kebede.
The previous record was set in 2006 by four-time winner Robert Kipkoech Cheruiyot, who is not related.
New York City Marathon winner Meb Keflezighi and fellow Californian Ryan Hall were among the leaders at the halfway mark. The finished fourth and fifth, respectively. Defending champion Deriba Merga was third.
Ethiopia's Teyba Erkesso was women's champion. Erkesso won in an unofficial time of 2 hours, 26 minutes, 11 seconds. That was three seconds ahead of Russia's Tatyana Pushkareva - the third-closest women's finish in event history.
Erkesso broke away from the pack with 17.7 kilometers (11 miles) to go and opened a 90-second lead. But she began holding her stomach in Cleveland Circle, with about four miles to go, and Pushkareva closed the gap to 16 seconds as they approached the 1.61-kilometer (1-mile) mark at Kenmore Square.
It's Ethiopia's fifth women's victory.
South African Ernst Van Dyk won the men's wheelchair division Monday for a record ninth time in a thrilling finish. He passed American Krige Schabort down the stretch to win by four seconds in 1:26:53.
Japan's Wakako Tsuchida won the women's wheelchair race in 1:43:32. It was her fourth title.
The wheelchair racers led the way across the start with temperatures in the high 40s and a headwind of 13 mph. The rest of the field left Hopkinton, Mass. at 10:30 a.m.
More than 26,000 runners registered for the 114th edition of the race. Race officials say 2,839 runners never picked up their numbers. Some were stranded in Europe, due to the airline crisis caused by a volcano in Iceland
First prize is up to $150,000.
Watch video from CBS Station WBZ in Boston