Usain Bolt of Jamaica broke the world record by winning the 200 meters in 19.30 seconds Wednesday, becoming the first man since Carl Lewis in 1984 to sweep the 100 and 200 gold medals at an Olympics.
Usain Bolt capped his spectacular Summer Games by tearing through his portion of the 400-meter relay Friday, setting up Jamaica's victory in 37.10 seconds to break a 16-year-old world record.
In a pair of races that brought some redemption after a disappointing Olympics for the U.S. track and field team, Wariner, Richards and Allyson Felix led a sweep of the 1,600-meter relays Saturday.