Bob, left, and Mike Bryan react while playing Radek Stepanek of the India's Leander Paes and Czech Republic's Radek Stepanek during the men's doubles final of the 2012 US Open tennis tournament, Friday, Sept. 7, 2012, in New York. (AP Photo/Mike Groll)
Serena Williams reacts after winning her match against Czech Republic's Andrea Hlavackova in the fourth round of play at the 2012 US Open tennis tournament, Monday, Sept. 3, 2012, in New York. (AP Photo/Kathy Willens)
United States' Serena Williams, left, celebrates with partner Venus Williams, right, after defeating Czech Republic's Lucie Hradecka and Andrea Hlavackova in a women's doubles gold medal tennis match at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Victor R. Caivano)
United States' Serena Williams, left, celebrates with partner Venus Williams, right, after defeating Czech Republic's Lucie Hradecka and Andrea Hlavackova in a women's doubles gold medal tennis match at the All England Lawn Tennis Club at Wimbledon, in London, at the 2012 Summer Olympics, Sunday, Aug. 5, 2012. (AP Photo/Victor R. Caivano)
USA's Candace Parker is congratulated by teammates after a basket agains the Czech Republic during a women's basketball game at the 2012 Summer Olympics, Friday, Aug. 3, 2012, in London. (AP Photo/Charles Krupa)
USA's Candace Parker is congratulated by teammates after a basket agains the Czech Republic during a women's basketball game at the 2012 Summer Olympics, Friday, Aug. 3, 2012, in London. (AP Photo/Charles Krupa)
Serena Williams of the United States reacts winning against Petra Kvitova of the Czech Republic during a quarterfinals match at the All England Lawn Tennis Championships at Wimbledon, England, Tuesday, July 3, 2012. (AP Photo/Anja Niedringhaus)
Serena Williams of the United States reacts winning against Petra Kvitova of the Czech Republic during a quarterfinals match at the All England Lawn Tennis Championships at Wimbledon, England, Tuesday, July 3, 2012. (AP Photo/Anja Niedringhaus)
Serena Williams of the United States follows the ball during a quarterfinals match against Petra Kvitova of the Czech Republic at the All England Lawn Tennis Championships at Wimbledon, England, Tuesday, July 3, 2012. (AP Photo/Anja Niedringhaus)
