On the day track and field got under way, swimming took center stage again as Michael Phelps came from behind to win the 100-meter butterfly for his third gold medal of the London Games on Friday in the final individual race of his Olympic career.

It was the 17th gold and 21st overall Olympic medal.

Also in the pool, American teen sensation Missy Franklin set a world record in the 200 backstroke, winning her third gold medal in London, and the youngest member of the U.S. team, 15-year-old Katie Ledecky, won gold in the 800 freestyle.

Meanwhile, the U.S. women’s soccer team reached the semifinals, Serena Williams reached the women’s tennis final against Maria Sharapova, Roger Federer will face Andy Murray for the men’s tennis title, the U.S. women’s volleyball team won its pool, the U.S. women’s basketball team won easily and defending beach volleyball gold medalists Todd Rogers and Phil Dalhausser were knocked out.