Kenya's Eliud Kipchoge crosses the finish line to win the elite men's race of the 2016 London Marathon in central London on April 24, 2016. Eliud Kipchoge of Kenya set a new course record in winning the London Marathon for the second straight year on Sunday. The former track star clocked an unofficial time of 2hrs 03mins 05secs, just eight seconds shy of the world record set by fellow Kenyan Dennis Kimetto at the Berlin Marathon in September 2014. AFP/JUSTIN TALLIS
General view as the runners collect their medals after finishing the marathon. Reuters/Paul Childs
Stanley Biwott of Kenya passes Big Ben during the 2016 Virgin Money London Marathon on April 24, 2016 in in London, England. Joel Ford/Getty Images
Portugal's Alexandrino Silva competes in the men's Wheelchair T53/54 race of the 2016 London Marathon in central London on April 24, 2016. AFP/NIKLAS HALLE'N
The elite men run over Tower Bridge during the Virgin London Marathon 2016 on April 24, 2016 in London, England. Photo by Chris Ratcliffe/Getty Images
Runners cross over Tower Bridge, as seen from the glass floor of Tower Bridge walkway, during the 36th London Marathon at United Kingdom on April 24, 2016 in London, England. Chris Ratcliffe/Getty Images
A runner celebrates after setting a Guinness world record as the fastest man dressed as a spaceman to finish a marathon. Reuters/Paul Childs
Kenya's Jemima Sumgong is pictured after winning the Elite Women's race of the 2016 London Marathon in central London on April 24, 2016. AFP / JUSTIN TALLIS
Runners cross over Tower Bridge, as seen from the glass floor of Tower Bridge walkway, during the 36th London Marathon at United Kingdom on April 24, 2016 in London, England. Chris Ratcliffe/Getty Images
2016 Virgin Money London Marathon medals. Reuters/Andrew Boyers
Kenya's Eliud Kipchoge (3R) runs behind a pacemaker at the head of the elite men's race of the 2016 London Marathon in central London on April 24, 2016. Eliud Kipchoge of Kenya set a new course record in winning the London Marathon for the second straight year on Sunday. The former track star clocked an unofficial time of 2hrs 03mins 05secs, just eight seconds shy of the world record set by fellow Kenyan Dennis Kimetto at the Berlin Marathon in September 2014. AFP/NIKLAS HALLE'N
Kenya's Eliud Kipchoge reacts after crossing the finish line to win the elite men's race of the 2016 London Marathon in central London on April 24, 2016. Eliud Kipchoge of Kenya set a new course record in winning the London Marathon for the second straight year on Sunday. The former track star clocked an unofficial time of 2hrs 03mins 05secs, just eight seconds shy of the world record set by fellow Kenyan Dennis Kimetto at the Berlin Marathon in September 2014. AFP/JUSTIN TALLIS
Kenya's Jemima Sumgong crosses the finish line to win the Elite Women's race of the 2016 London Marathon in central London on April 24, 2016. AFP/JUSTIN TALLIS