Allyson Felix and LaShawn Merritt defeated old rivals Friday to win gold medals for the United States at the World Track Championship. The American success was tempered, however, by the disqualification of the U.S.

Bernard Lagat and Dawn Harper, hoping to win gold medals for the United States, suffered major disappointments Wednesday at the World Track Championship. Usain Bolt, meanwhile, coasted into the semifinals of the 200-meter dash and LaShawn Merritt set up another duel with rival Jeremy Wariner in the 400. Lagat found himself boxed in on the final turn of the 1,500-meter run and by the time he got clear, his strong finishing kick could bring him only a third-place finish.

The United States won both 1,600-meter relays Saturday, helping take some of the sting off a disappointing Olympic track effort by the Americans.

By Kevin Fylan BERLIN (Reuters) - Jamaican sprinter Asafa Powell and American 400 meters runners Jeremy Wariner and Sanya Richards completed perfect Golden League seasons on Sunday to scoop $250,000 shares in the double jackpot.

By Kevin Fylan BERLIN (Reuters) - Asafa Powell, Jeremy Wariner and Sanya Richards completed perfect Golden League seasons on Sunday to scoop $250,000 shares in the double jackpot.