FILE - In this Sunday, April 26, 2015 file photo, Eliud Kipchoge of Kenya wins the Men's race in the 35th London Marathon. On the 63rd anniversary of Roger Bannister breaking the four-minute mile, three elite athletes will attempt to do something arguably more extraordinary, run the first sub-two-hour marathon. Olympic marathon champion Eliud Kipchoge leads the attempt on Saturday, May 6, 2017 at Monza's Formula One racecourse, along with two-time Boston Marathon winner Lelisa Desisa, from Ethiopia, and Eritrean half-marathon world-record holder Zersenay Tadese. (AP Photo/Kirsty Wigglesworth, File)