Kenya's Ruth Chepngetich obliterated the women's marathon world record in Chicago on Sunday, lopping nearly two minutes off the previous best to win in an unofficial time of two hours, nine minutes and 57 seconds.
Chepngetich got off to a blazing start and left the rest of the competition behind her by the halfway mark and went on to claim her third title in Chicago and break Ethiopian Tigst Assefa's previous record of 2:11:53, set last year in Berlin.
