Dathan Ritzenhein (right) compete in the men's 10,000-meter final during Day One of the 2012 U.S. Olympic Track & Field Team Trials at Hayward Field on June 22, 2012 in Eugene, Oregon.
Name: Dathan Ritzenhein
Country: United States
Stats: Ritzenhein finished ninth at the Bank of America Chicago Marathon last year with a personal best of 2:07:47, making him the third-fastest American of all-time. He finished 13th in the Olympic 10,000m final as a member of his third Olympic team.
Details: The Michigan native has won accolades for his running performance since high school. He rose through the college ranks and finished 11th in his marathon debut in New York in 2006 with a time of 2:14:01. He is no stranger to Chicago and was the first American to cross the finish line at last year's marathon.