Key dates: Aug. 5, singles and doubles finals Venue: Wimbledon Big stories: Serena Williams (above), 30, says she's happier and healthier than she has ever been and she just finished winning Wimbledon on grass then won the tournament at Stanford. She seems on a grass court roll and has never won a singles gold. She and her 32-year-old sister Venus Williams won the women's doubles at Wimbledon, making them favorites to defend their Olympic title. Top U.S. prospect: Lisa Raymond and Liezel Huber will also represent the U.S. in doubles and are ranked No. 1 in the world. The Williams sisters, who don't have a ranking because they don't play enough together, easily beat the top-ranked Americans at Wimbledon. Christina McHale, 20, and ranked 32nd in the world would have a slight chance at a bronze medal. Venus and Varvara Lepechenko, the other American singles players would be huge upsets if they were to win a medal. Others to watch: Maria Sharapova, who won the French Open in May was upset in the fourth round of Wimbledon, the same day Kim Clijsters was knocked out. Sharapova, who won her first major at Wimbledon, could challenge Williams as could Wimbledon runner up Agnieszka Radwanska and 2011 Wimbledon champion Petra Kvitova. Little-known fact: So far four women's tennis players (Sharapova-Russia, Radwanska-Poland, Stephanie Vogt-Lichtenstein, Tsevetana Pironkova-Bulgaria) have been named flag bearers for their countries in the opening ceremony.
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