Britain's Keri-Anne Payne smiles after winning the women's 10km open water swimming event of the FINA World Championships in Shanghai on July 19, 2011. Payne, who took silver at the 2008 Beijing Games, swam the women's 10km open water in 2hr 1min 58.1secs, ramping up hopes for London 2012. AFP PHOTO/PHILIPPE LOPEZ (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)
Britain's Keri-Anne Payne smiles after winning the women's 10km open water swimming event of the FINA World Championships in Shanghai on July 19, 2011. Payne, who took silver at the 2008 Beijing Games, swam the women's 10km open water in 2hr 1min 58.1secs, ramping up hopes for London 2012. (PHILIPPE LOPEZ/AFP/Getty Images)
AFP/Getty Images
Champion open water swimmer Keri-Anne Payne won silver at the 2008 Beijing Games and will be jumping into the chilly waters of London's Hyde Park to compete for gold in the 2012 Games.