WILSON KIPSANG (Kenya) - Age 31.
Marathon best - 2:03:42 Frankfurt 2011.
Winner of London Marathon last year and finished third at the Olympics in August. Missed the world record by four seconds when winning in Frankfurt in 2011.
PATRICK MAKAU (Kenya) - Age 28. Marathon best 2:03.38 (world record) Berlin 2011.
Broke Ethiopian Haile Gebrselassie's world mark by 21 seconds. Finished third on his London debut in 2011 but dropped out of last year's race after 16 km with a hamstring injury and was not selected for the Kenyan Olympic team.
STEPHEN KIPROTICH (Uganda) - Age 24. Marathon best 2:07.20 Enschede 2011.
Olympic champion Kiprotich was a surprise winner at the London Games after accelerating away from the fancied Kenyans Wilson Kipsang and Abel Kirui with six km left. He became Uganda's second Olympic champion, 40 years after 400 metres hurdler John Akii-Bua. This is his first appearance in the London Marathon.
GEOFFREY MUTAI (Kenya) - Age 31. Marathon best 2:04:15 Berlin 2012.
The 2011/12 World Marathon Majors champion having won in Berlin last year and Boston and New York in 2011. His time of 2:03:02 in Boston is the quickest recorded for a marathon but was not classed as a world record because of the downhill course. He was also aided by a strong tailwind. Making his debut in London.
TSEGAYE KEBEDE (Ethiopia) - Age 25. Marathon best 2:04:38 Chicago 2012.
Won in London in 2010, ending six years of Kenyan dominance of the race. Finished third last year and was not picked for the Ethiopian Olympic team despite winning bronze in Beijing in 2008. Came back to win the Chicago Marathon, breaking the course record by almost a minute.