The two-time world championships medalist will race the 2-mile in Boston on Saturday.
Take a look back at the exciting 2013 season and see who we named the top runners of the year.
In just a decade, American runners are now winning major races.
The duo will race at the Reggie Lewis Track and Athletic Center on Feb. 8.
The American middle-distance ace wants to have fun.
Nick Willis was well under 4 minutes for the men.
The Americans bring a strong field to this year's race in the heart of Manhattan.
American runners had a good showing last week in Moscow!
The American captured her second career world championship medal on Thursday night.
A look back at Jenny Simpson's career in pictures.