(01 of21)
Open Image ModalRunners start the Chicago Marathon in Chicago, Sunday, Oct. 13, 2013, nearly six months after the Boston Marathon bombings, with more police officers lining race routes and spectator areas. (AP Photo/Nam Y. Huh) (credit:AP)
Dennis Kimetto(02 of21)
Open Image ModalDennis Kimetto of Kenya crosses the finish line to win the Chicago Marathon on Sunday, Oct. 13, 2013, in Chicago. (AP Photo/Andrew A. Nelles) (credit:AP)
(03 of21)
Open Image ModalA runner grabs water at an aid station during the annual Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. (AP Photo/Nam Y. Huh) (credit:AP)
Rita Jeptoo(04 of21)
Open Image ModalRita Jeptoo of Kenya wins the women\'s race during the Chicago Marathon on Sunday, Oct. 13, 2013, in Chicago. (AP Photo/Andrew A. Nelles) (credit:AP)
Rita Jeptoo(05 of21)
Open Image ModalRita Jeptoo of Kenya wins the women\'s race during the Chicago Marathon on Sunday, Oct. 13, 2013, in Chicago. (AP Photo/Andrew A. Nelles) (credit:AP)
(06 of21)
Open Image ModalRunners grab drinks at an aid station during the annual Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. (AP Photo/Nam Y. Huh) (credit:AP)
(07 of21)
Open Image ModalA Chicago police officer patrols during the annual Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. The marathon is the first World Marathon Major in the United States since the Boston Marathon bombings last April and will be the most closely watched. (AP Photo/Nam Y. Huh) (credit:AP)
(08 of21)
Open Image ModalA runner grabs water from Alana Friend at an aid station during the annual Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. (AP Photo/Nam Y. Huh) (credit:AP)
(09 of21)
Open Image ModalChicago police officers patrol during the annual Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. The marathon is the first World Marathon Major in the United States since the Boston Marathon bombings last April and will be the most closely watched. (AP Photo/Nam Y. Huh) (credit:AP)
(10 of21)
Open Image ModalRunners participate in the Chicago Marathon in Chicago, Sunday, Oct. 13, 2013, nearly six months after the Boston Marathon bombings, with more police officers lining race routes and spectator areas. (AP Photo/Nam Y. Huh) (credit:AP)
(11 of21)
Open Image ModalRunners grab water at an aid station during the annual Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. (AP Photo/Nam Y. Huh) (credit:AP)
(12 of21)
Open Image ModalRunners participate in the Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. (AP Photo/Nam Y. Huh) (credit:AP)
(13 of21)
Open Image ModalRunners grab water at an aid station during the annual Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. (AP Photo/Nam Y. Huh) (credit:AP)
(14 of21)
Open Image ModalRunners participate in the Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. (AP Photo/Nam Y. Huh) (credit:AP)
(15 of21)
Open Image ModalA Chicago Police officer looks around before start the Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. The marathon is the first World Marathon Major in the United States since the Boston Marathon bombings last April and will be the most closely watched. (AP Photo/Nam Y. Huh) (credit:AP)
(16 of21)
Open Image ModalRunners participate in the Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. (AP Photo/Nam Y. Huh) (credit:AP)
(17 of21)
Open Image ModalRunners start the Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. (AP Photo/Nam Y. Huh) (credit:AP)
(18 of21)
Open Image ModalRunners start the Chicago Marathon in Chicago, Sunday, Oct. 13, 2013. (AP Photo/Nam Y. Huh) (credit:AP)
Tatyana McFadden(19 of21)
Open Image ModalTatyana McFadden, of Champaign, Ill., wins the woman\'s wheelchair division during the Chicago Marathon on Sunday, Oct. 13, 2013, in Chicago. (AP Photo/Andrew A. Nelles) (credit:AP)
Ernst Van Dyke, Kurt Fearnley(20 of21)
Open Image ModalErnst Van Dyke, left, of South Africa, edges out Kurt Fearnley, right, of Australia, to win the men\'s wheelchair division during the Chicago Marathon on Sunday, Oct. 13, 2013, in Chicago. (AP Photo/Andrew A. Nelles) (credit:AP)
(21 of21)
Open Image ModalRunners depart from the starting line during the Chicago Marathon, Sunday, Oct. 13, 2013, in Chicago. (AP Photo/Andrew A. Nelles) (credit:AP)