Kenyans Dickson Chumba and Florence Kiplagat aim to defend their titles at the Chicago Marathon Sunday, with 2012 winner Tsegaye Kebede out to spoil Chumba's repeat bid in the Windy City. Chumba pulled away in the final three miles to lead a Kenyan sweep of the podium last year in 2hr 09min 25sec, with Sammy Kitwara second and Sammy Ndungu third. It was the slowest time in Chicago since 2007 after organizers opted not to use pace-setters. The 29-year-old Chumba, who finished third in Tokyo in 2:07:34 in his only prior marathon this year, is expected to face a strong challenge from Ethiopia's Kebede, whose 2012 time of 2:04:38 was a personal best and then-course record. Kebede is also remembered for a thrilling 2010 duel in Chicago with Sammy Wanjiru, who emerged with the victory. World record-holder Dennis Kimetto was initially scheduled to race but was forced to withdraw due to a leg injury. Three other men in the field have run 2:07 or better, including Ethiopian Abayney Ayele — who clocked 2:06:45 in Dubai this year — and Chumba's fellow Kenyans Abel Kirui and Micah Kogo. Kogo is still seeking a first marathon victory. He set his personal best of 2:06:56 in finishing fourth in Chicago in 2013. Another intriguing challenger is Kenyan Stephen Sambu, making his marathon debut. Sambu, who has been outstanding in shorter distance road races since graduating from the University of Arizona in 2012, warmed up for the event with a victory in the seven-mile Falmouth Road Race in August. In the women's race, Kiplagat will try to become the first woman to win back-to-back titles since Berhane Adere of Ethiopia in 2006 and 2007. Fellow Kenyan Edna Kiplagat, who is the only other woman in the field to have run faster than 2:20, will make be running in Chicago for the first time, as will Ethiopian Gulume Chala. The other former champion in the field is Atsede Baysa, who won in Chicago in 2010 and 2012, while Melese returns vying to improve on her runner-up finish of last year. Paris Marathon winner Visiline Jepkesho, who represented Kenya at the Rio Olympics, is also in the field.
