LONDON - Kenya's Wilson Kipsang and Mary Keitany triumphed in the London Marathon here on Sunday as the African nation served notice of its distance running strength ahead of the Olympic Games.

Kipsang, the second fastest man of all time, went clear of a class field in the closing stages and won in a time of two hours, four minutes and 44 seconds -- just four seconds outside the course record set by compatriot Emmanuel Mutai in winning last year's race. He finished more than two minutes in front of compatriot Martin Lel (2:06:51), who overtook fellow former London champion Tsegaye Kebede of Ethiopia with a strong sprint finish Kebede may have prevented a clean sweep in his race but in the women's event Keitany successfully defended her title and enhanced her credentials for an Olympic gold in London in a few months' time as Kenyan runners monopolised the top five spots.

Keitany left an outstanding field trailing to win in a time of 2:18:37, a new Kenyan national record and a personal best -- well inside her time of 2:19:19 she posted in winning last year's London Marathon. World champion Edna Kiplagat finished second, more than a minute behind in 2:19:50, with world silver medallist Priscah Jeptoo a further 24 seconds behind in third.