London Marathon 2012: Kenyan double as Wilson Kipsang and Mary Keitany coast to victories Kebede may have prevented a Kenyan clean sweep in his race but in the women's event Mary Keitany successfully defended the title she won last year to lead home a Kenyan 1-2-3. She left an outstanding field trailing to win in an unofficial time of 2:18:36, a new Kenyan national record and a personal best - well inside her time of 2:19:19 in which she won last year's London Marathon. World champion Edna Kiplagat finished second, more than a minute behind, with world silver medallist Priscah Jeptoo a further 24 seconds behind in third. Keitany said it was a "very tough" victory and that she already has her sights on success here at the Olympics on Aug. 5. "Everyone was just looking for the Olympic time in order to be selected," she said. It's great for me to win the race for the second time. I hope they will select me now for the Olympics. I want to go and try to get a medal at the Olympics ... on Friday I went to look at the route. There was success for Britain in the wheelchair races with Dave Weir and Shelly Woods ensuring a home double. Weir timed his finish to perfection to see off the challenge of Switzerland's Marcel Hug and so win his sixth London title while Woods overpowered her rivals to claim a second London victory of her career, finishing nearly four minutes ahead of Japan's Wakako Tsuchida.