Tyson Gay recovered from a poor start to pip fellow American Justin Gatlin and win the Diamond League 100m in Paris in 9.99 seconds.
Gay, beaten by Gatlin at the recent US Olympic trials, came through powerfully ahead of Gatlin, who clocked 10.03, and Frenchman Christophe Lemaitre in 10.08.
Gay was delighted with his victory, which was a reversal of the result when the sprinters met at the US trials.
Jamaicans Micheal frater and Nickel Ashmeade tied for fourth in a time of 10.14.
