Geoffrey Kirui, of Kenya, leads Galen Rupp, of the United States, and the rest of the field along the course of the 121st Boston Marathon on Monday, April 17, 2017, in Brookline, Mass. (AP Photo/Steven Senne)
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Geoffrey Kirui, of Kenya, leads Galen Rupp, of the United States, and the rest of the field along the course of the 121st Boston Marathon on Monday, April 17, 2017, in Brookline, Mass. (AP Photo/Steven Senne)
