Led by Shalane Flanagan's record performance, the elites shined at the B.A.A. 10K.
She ran even splits in her final tune-up before the Olympics.
There are hundreds of 10Ks in the United States, but these stand out.
The 25-year-old Sambu won Sunday's race in a world-leading time of 27:25.
Scenes from the fourth annual BAA 10K, won by Stephen Sambu and Mamitu Daska.
Scenes from the 2013 B.A.A. 10K in Boston — were you there?
Thousands turned out in Boston for the first road race since that city's marathon.
The American will run two 10Ks in under three days this week.
Jason Hartmann leads the American contingent.
Star-studded lineup will take to the streets of Boston later this month.