US swimmers Michael Phelps and Missy Franklin added to their impressive medal collections on Friday at the 2012 Summer Olympics in London. Here's a recap of the day's action from the London Games:

American Michael Phelps surged in the final 50 meters to win the men's 100-meter butterfly in a time of 51.21 seconds. Coming from seventh place, Phelps overwhelmed the field late to finish ahead of South African Chad le Clos and Russian Evgeny Korotyshkin, who tied for second. It was Phelps' 17th gold and 21st overall Olympic medal, both record totals. Fellow US swim team member Cullen Jones won a silver medal in the men's 50-meter freestyle, finishing just behind Florent Manaudou of France.

US swimmer Missy Franklin claimed her third gold medal of the London Games on Friday night, easily winning the women's 200-meter backstroke in a new world record time of 2:04:06 minutes. Russia's Anastasia Zueva grabbed the silver, with American Elizabeth Beisel earning the bronze. Franklin's teammate Katie Ledecky, the youngest American swimmer on the team at age 15, won the gold medal in the women's 800-meter freestyle on Friday. Ledecky upset Britain's Becky Adlington, the world-record holder in the event.

In the first day of competition in the track and field events, American Reese Hoffa claimed the bronze medal in the men's shot put, as Tomasz Majewski of Poland won the gold.

In other event results, the US women's soccer team advanced to the semifinals with a 2-0 win over New Zealand. The Americans will face Canada on Monday. Defending beach volleyball gold medalists Phil Dalhausser and Todd Rogers of the US were upset by Paolo Nicolai and Daniele Lupo of Italy, 21-17 and 21-19.

In men's tennis, Britain's Andy Murray beat No. 2-seeded Novak Djokovic of Serbia, 7-5 7-5, to advance to the Olympic final against Roger Federer of Switzerland in a rematch of July's Wimbledon final. Federer outlasted Juan Martin Del Potro of Argentina, 3-6 7-6(5) 19-17, in 4 hours and 26 minutes, the longest three set match in the history of the sport.

On the women's side, American Serena Williams rolled over world number one Victoria Azarenka, 6-1 6-2 on Friday to set up a gold medal match with Russian Maria Sharapova, who defeated countrywoman Maria Kirilenko, 6-3 6-3.

Overall Medal Leader Board

United States — 43 medals
21 Gold, 10 Silver, 12 Bronze

China — 42 medals
20 Gold, 13 Silver, 9 Bronze

Russia — 23 medals
3 Gold, 12 Silver, 8 Bronze

Great Britain — 22 medals
8 Gold, 6 Silver, 8 Bronze

Japan — 21 medals
2 Gold, 8 Silver, 11 Bronze

More From TSM Interactive