American Tyson Gay won the 200 meters in 19.76 seconds Thursday to complete a sprint double at the track and field world championships.
Gay had already won the 100, beating archrival and world record holder Asafa Powell of Jamaica.
Gay was the overwhelming favorite in the 200 after clocking 19.62 at the U.S. championships.
Usain Bolt led out of the bend and the pair was neck-and-neck until Gay surged ahead down the straight.
Bolt took silver in 19.91 and the United States got bronze via Wallace Spearmon in 20.05.
Gay is expected to go for a third gold medal as part of the U.S. team in the 400 relay.