No American man has won the race in Boston since Greg Meyer in 1983. Keflezighi and Hall have each finished third in the world's longest-running annual marathon.

Keflezighi won the New York Marathon last month. He owns the second-fastest American marathon time ever, running 2 hours, 6 minutes, 17 seconds.

Hall holds American records in the 20K and half marathon and was first at the 2007 U.S. Olympic Trials.