In the race, Bolt had a good start and came down the home straight with a considerable lead, continuing to pull away from the rest of the field. He passed the line in a new world-record time of 19.30 seconds. Giving Jamaica a third gold and making him the first man to complete the sprint double since Carl Lewis in 1984, and the first to do so in world record times. He also became the second Jamaican to win two gold medals at a single Olympic Games, after George Rhoden in 1952. The same day, Melaine Walker won the women's 400 m hurdles event in a new Olympic Record time of 52.64 seconds, breaking the old mark set in 1996 by Deon Hemmings. On 21 August, Jamaica completed a clean-sweep of all the individual sprints (100 and 200 m), and confirmed the nation's dominance when Veronica Campbell-Brown successfully defended her Olympic 200 m title winning the event ahead of Allyson Felix of the United States, and Kerron Stewart who took bronze. On 22 August, the Jamaican women's and men's 4 x 100 m relay teams took to the track. Their chances for victory were boosted when both American 4 x 100 m teams were knocked-out in the heats. The women's team of Shelly-Ann Fraser, Sherone Simpson, Kerron Stewart and Veronica Campbell-Brown were the first on the track, going reasonably well until the third changeover between Simpson and Stewart, which was poorly timed and resulted in the disqualification of the entire team. However, the men's team consisting of Nesta Carter, Michael Frater, Usain Bolt and Asafa Powell were next. Their own runs went without any problems, Powell received the baton from Bolt well ahead of the other teams, crossing the line in both the fastest electronically timed anchor run ever (8.70 seconds), and an overall world-record time of 37.10 seconds. This was a full 0.30 seconds quicker than the previous world record of 37.40 set by the Americans. Usain Bolt now had three gold medals and three World Records to his credit, and Jamaica had won 5 of the 6 available gold medals in the sprints, the only country to achieve this feat other than the American teams of 1984 and 1988. This made Jamaicans characterize this Olympic games as the ""JAlympics"". Jamaica's last medal of the games came in the women's 4 x 400 m relay. The team of Shericka Williams, Shereefa Lloyd, Rosemarie Whyte and Novlene Williams claimed bronze.