Mamitu Daska won her third Bolder Boulder Women's Professional race, the Ethiopian star broke away from the pack early and never looked back, finishing with a time of 33 minutes, 6.5 seconds.
Bermuda’s London Olympic Triathlete Flora Duffy finished 1035th out of a field of 5000 competitors.
Daska, who also won the Bolder Boulder in 2009 and 2010, led her country to its fourth consecutive International Team Challenge victory in the annual 10K.
Team USA, led by Janet Cherobon-Bawcom who finished second, with a time of 33:23.57 and Deena Kastor finished third, clocking 33:28.48, finished second. Kenya was third.
On the Men's side, Kenya's Allan Kiprono won with a time of 29:54.43. Ethiopians Tadese Tolo was second in 30:03.73 and Brihanu Gedefa was third in 30:07.14 were second and third, respectively.
Ethiopia extended its win streak in the Men's International Team challenge to six. Kenya was second and Mexico was third.
Duffy recorded a time of 42:46.31 running the course at a 6:31 pace. Duffy finished 6th out of 617 in her Age Group Division and she was the 145th out of 25104 Female Finishers.
Duffy covered the first mile in a time of 6:04.30, then then clocked 6:30.83 for the second mile. Her time for the third mile was even slower clocking 7:00.07 for the 3rd mile, before running 7:10.70 for the 4th mile.
Duffy picked up the pace in the 5th mile when she clocked 7:00.39, but then dropped off the pace for the final mile with a time of 7:25.03.