The American is part of a fast field that will take part in Sunday's half marathon.
Check out these great shots from the 16th annual Rock 'n' Roll Marathon & Half Marathon!
The 25-year-old Kenyan runs the fastest half-marathon ever on American soil.
The two-time defending champion will have his hands full in this year's half marathon.
Both the men's and women's races were dominated by Kenyans.
Kenyans Edna Kiplagat and Bernard Koech are the headliners.