David Banks/Getty Images
Atsede Baysa of Ethiopia (R) and Rita Jeptoo of Kenya finish first and second in the womens 2012 Bank of America Chicago Marathon on October 7, 2012 in Chicago, Illinois. Baysa won the race. (Photo by David Banks/Getty Images)
Name: Rita Jeptoo
Stats: Jeptoo came in second, just behind Atsede Baysa, at last year's Chicago Marathon with a time of 2:22:04. She has won the Boston Marathon twice, in 2006 and 2013, the second of which she finished with a time of 2:26:25. She entered international competition in 2000 and won her first marathon in Stockholm in 2004.
Details: Jeptoo barely missed the Chicago Marathon win last year, competing neck-and-neck with Baysa near the end of the race. She returns to the competition hoping to solidify her win.