Defending champion Wesley Korir, of Kenya, warms up prior to the start of the 117th running of the Boston Marathon, in Hopkinton, Mass., Monday, April 15, 2013. (AP Photo/Stew Milne)
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Defending champion Wesley Korir, of Kenya, warms up prior to the start of the 117th running of the Boston Marathon, in Hopkinton, Mass., Monday, April 15, 2013. (AP Photo/Stew Milne)
