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LONDON, ENGLAND - JULY 30: Misty May-Treanor of the United States dives for a shot during the Women's Beach Volleyball Preliminary match.
South El Monte boxer Joseph Diaz Jr. had a much-anticipated rematch in the ring and the U.S. women's water polo team played to a draw with Spain.
Note: Page will be updated with results.
Women's Volleyball: United States v. China
The showdown pits China against the world No. 1 United States in a battle for Group B supremacy. The U.S. soundly defeated world No. 2 Brazil in its last contest. Four teams advance from each pool to the quarterfinals.
Watch: NBC, 2 p.m. | LIVE Online at Noon
Women's Basketball: United States v. Turkey
The United States is coming off a 52-point win over Angola, but should get a tougher test Wednesday. The United States defeated Turkey in a pre-Olympics exhibition, but it was a close game for three quarters. This could be the toughest matchup of the tournament for the U.S. -- winners of consecutive games in Olympic competition -- or a statement game.
Watch: NBC, NBC Specialty, 2 p.m. (LIVE) | LIVE Online at 2 p.m.
Women's Beach Volleyball: Misty May-Treanor/Kerri Lee Walsh v. Austria
The matches are winding down for the Southern California team of Misty May-Treanor and Kerri Lee Walsh. In what will be their last Olympics together, the dominant team in women's beach volleyball will take on Austria after responding well to challenges in their first two contests.
Watch: NBC, 8 p.m. (Primetime) | LIVE Online at 3 p.m.
Women’s Water Polo: USA v. Spain
The United States, led by captain Brenda Villa of Commerce, gave up an unusually high 13 goals against Hungary in the opener. One problem for Hungary -- Maggie Steffens tied an Olympic record with seven of the United States' 14 goals. Spain beat World Championship runner-up China on Monday and proved they're here to challenge the world's best -- Wednesday's game ended in a tie, despite four goals from Santa Barbara's Cami Craig.
Women's Tennis, Third Round: Serena Williams v. V. Zvonareva; Venus Williams v. A. Kerber
Serena Williams needed just 51 minutes to oust Russia's Vera Zvonereva in the quarterfinal, 6-1, 6-0. But her sister, Venus, dropped her match to Germany's Angelique Kerber, 7-6, 7-6.
Men's Boxing: Joseph Diaz Jr. v. Lazaro Alvarez
Diaz Jr. lost a hard-fought bout, 21-15 in the round of 16. He tweeted after the bout: "Thank you everyone for the support! I didn't pick up the victory but I hope I gave everyone a show they wanted to see! Love y'all!!" The last time the South El Monte bantamweight faced Cuba's Lazaro Alvarez -- a bout at the 2011 World Championships -- the 19-year-old Diaz lost, 19-10.
Men's 3m Sychro Springboard: Troy Dumias/Kristian Ipsen
Ventura native Troy Dumais, 32, teams with 19-year-old Kristian Ipsen, of Clayton. Dumais is a four-time Olympian with four sixth-place finishes in diving events, but he finally won a medal Wednesday, earning bronze with Ipsen. China won the event.
Watch: NBC, 8 p.m. (Primetime) | Results
Men's Beach Volleyball: Jake Gibb/Sean Rosenthal v. Latvia
The Americans rebounded against Latvia after losing their second match of the tournament to a team from Poland that did little wrong. Jake Gibb and Sean Rosenthal are seeded No. 4, and they looked like strong medal contenders with a 21-10, 21-16 win Wednesday.