Marathon world record progression races were first held in 1896, but the distance was not standardized by the International Association of Athletics Federations (IAAF) until 1921. The actual distance for pre-1921 races frequently varied slightly from the present figure of 42.195 km (26 miles 385 yards). In qualifying races for the 1896 Summer Olympics, Greek runners Charilaos Vasilakos (3:18:00) and Ioannis Lavrentis (3:11:27) won the first two modern marathons. On April 10, 1896, Spiridon Louis of Greece won the first Olympic marathon in Athens, Greece in a time of 2:58:50; however, the distance for the event was reported to be only 40,000 meters. Three
Johnny Miles stayed with him until Heartbreak Hill, at which point he passed him. Miles completed the race in a time of 2:25:40. His time was so fast that the course was remeasured and found to be 176 yards short. Miles attempted to defend his title at the 1927 Boston Marathon, but dropped out early due to problems with his shoes. In 1929 Miles returned to Boston and won the marathon in a time of 2:33:08. Miles competed in two more Boston Marathons, never finishing higher than 10th. Between his two wins in Boston, Miles won the Canadian 10000 metre championship in