I’ve been waving the Kenyan flag a lot lately. Last week, I waved it for Wesley Korir and Sharon Cherop, who won the men’s and women’s titles at the Boston Marathon. In this video, I wave it again for Kenyan athletes Wilson Kipsang and Mary Keitany, who won the men’s and women’s races at the London Marathon.

With their victories in the British capital, Kipsang and Keitany are good bets to make Kenya’s 2012 Olympic team. The Kenyans will be bidding to win gold medals in both the men’s and women’s Olympic marathons in London.

In successfully defending her London title, Keitany set a new African record of 2:18:37, breaking the mark of Kenyan countrywoman Catherine Ndereba, a silver medalist in the women’s marathon at the 2008 Beijing Olympics. Kipsang, meanwhile, is hoping to become the second Kenyan to win Olympic gold in the men’s marathon. The late Sammy Wanjiru, the subject of a recent Sports Illustrated article, set an Olympic record of 2:06:32 at the Beijing Games.

Also in the video above, we see and hear from Caster Semenya, the South African 800 meter runner who will be competing in her first Olympics in London. The 21-year-old Semenya won a silver medal at last year’s world championships in South Korea and a gold medal at the 2009 world championships in Germany. She says her big goal this year is to win her first Olympic gold medal in London.