London 2012 Olympics: Asafa Powell pulls out of Crystal Palace race with groin injury Powell is the fourth fastest man in the world this year behind compatriots Yohan Blake and Usain Bolt, and American Justin Gatlin. He has run under 10 seconds more than 80 times in his career, but has never won an individual gold at a major international championship, finishing fifth in the Olympic 100m final in both Athens and Beijing. In Powell's absence team-mates Nesta Carter and Michael Frater will lead the Jamaican charge for Diamond League success at Crystal Palace as they are set to go head-to-head with Gay and Trinidadian Keston Bledman in the final. Britain's Dwain Chambers will also be vying for a place in the final in his first domestic Diamond League competition since his return to the sport from his drugs suspension. In the other events on the track, world championship gold medallist Dai Greene takes on his main rival Javier Culson in the 400m hurdles and Mo Farah will compete against Australian Craig Mottram and Ugandan Moses Kipsiro in the 5,000m.