Michael Phelps is putting an exclamation point on his illustrious career.  The American swimming star won the men's 100-meter butterfly in what is expected to be his final individual race in Olympic competition. Already the most decorated Olympian of all-time, Phelps extended his Olympic records to 17 gold and 21 medals overall. American Missy Franklin is the new world record holder in the women's 200-meter backstroke. The 17-year old claimed her third gold medal of the London Games while fellow U.S.teenager 15-year old Katie Ledecky won the women’s 800 meter freestyle. Meanwhile, American Cullen Jones is celebrating a silver medal in the men's 50-meter freestyle. The U.S.women's soccer team will play Canada in the Olympic semifinals. Team USA shut out New Zealand 2-0 in their quarterfinal match. American Reese Hoffa is the bronze medal winner in the men's shot put as track and field events are underway inLondon. And theU.S.women's basketball team improved to  4-and-0 in the London Olympics with an 88-61 win over theCzech Republic. TheUnited States continues to hold the lead in the medal count standings. The Americans have collected 43 medals through Friday's events.Chinais alone in second place with 42 medals. The U.S.also leads in gold medals with 21.China has 20.