Gold: Swimming - Men's 4x100 Meter Medley Relay - 3:27 p.m. (NBC Prime Time). After four Olympic Games, 21 medals including 17 gold, Michael Phelps competes for the very last time Saturday. He will swim the butterfly leg on the highly favored American medley relay team. Three of the four legs will be swum by gold medalists, the other by a bronze medalist. Expect a big U.S. win. The final day of swimming actually begins at 2:30 p.m. with the Women's 50 Freestyle and the Men's 1,500 Freestyle. The women swim their medley relay at 3:07 p.m. and they will be highly favored with gold medalists Missy Franklin in backstroke and Dana Vollmer in butterfly and silver medalist Rebecca Soni in the breaststroke. The freestyle leg could be either Jessica Hardy or Allison Schmidt. Either way expect the U.S. to win easily with Australia being the leading challengers.
Silver: Tennis - Women's Singles Final - 9 a.m. (NBC) A marquee matchup as Serena Williams of the United States will face Russian Maria Sharapova. The winner will join Rafael Nadal, Steffi Graf and Andrei Agassi with a career Golden Slam. The match takes place in one of the most iconic sporting venues in the world, at Wimbledon Centre Court.
Bronze: Track & Field - Women's 100 Meters - 4:55 p.m. (NBC Prime Time) The world's fastest woman will be crowned and it will likely be an American or Jamaican. Defending champion Shelly-Ann Fraser-Pryce was the first non-American winner since 1980; current world champion Carmelita Jeter of the U.S. looked most impressive in the heats; Allyson Felix is better at 200 meters but improving over 100; Tianna Madison was a world long jump champion seven years ago, but has concentrated on sprinting; Veronica Campbell-Brown is the two-time defending champion over 200 meters and a former 100 meter world champion.
U.S. men's basketball faces Lithuania at 9:30 a.m. (NBCSN)
Misty May-Treanor and Kerri Walsh Jennings are in the round of sixteen against the Dutch at 4 p.m. (NBC Prime Time)
Jake Gibb and Sean Rosenthal are the lone American hopes in men's beach volleyball. They are in the round of 16 against Russia at 5 p.m. (NBC)
The U.S. women's field hockey team face a must-win against New Zealand as only two teams will advance out of pool play. Game time is 2 p.m. (NBCSN)
The home team British soccer side faces South Korea in the quarterfinals at 2:30 p.m. (MSNBC)
Another tennis gold medal will be on the line in men's doubles as Mike & Bob Bryan are trying to win the first American gold in the event since Ken Flach and Robert Seguso in 1988. They will face the French team of Michaël Llodra and Jo-Wilfried Tsonga at 11 a.m. (NBCSN)
The U.S. men's volleyball takes on 2-1 Russia at 11:45 a.m. (NBC)
The U.S. men's water polo team is surprisingly undefeated after three matches. They face a very tough test against 2-1 Serbia at 2:40 p.m. (NBC)
The men's 10,000 meters will feature Mo Farah of Great Britain as a favorite in front of the home crowd at 4:15 p.m. (NBC)