Tianna Madison, Allyson Felix, Bianca Knight and anchor Carmelita Jeter helped set a world record of 40.82 seconds as the United States won the womenís 4x100-meter relay for the first time since 1996, while the 4x100 menís relay team broke a 20-year-old national record in the preliminary round to highlight Fridayís Olympic action.

Also, Kevin Durant powered the U.S. menís Olympic basketball team past Argentina, 109-83, to set up a matchup with Spain for the gold medal.

Jordan Burroughs won the menís freestyle 74-kilogram division to give the U.S. its first wrestling gold medal in London.

The Bahamas upset the U.S. in the final of the menís 4x400 relay.