Serena Williams

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ASSOCIATED PRESS Serena Williams reacts during her match against Ana Ivanovic. Williams won 6-3, 6-4 to move into the quarterfinals.

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Serena Williams, who sat out a year with a variety of health problems, continued her comeback Tuesday night, taking part in mixed doubles, doubles and singles in World Team Tennis. She won doubles and singles but lost mixed doubles. (Associated Press)

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ASSOCIATED PRESS Serena Williams has turned her back on her hot-tempered ways, preferring to serve as a role model for youths.

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Venus (left) and Serena Williams, at the Southeast Tennis and Learning Center in April, are marquee players for the Washington Kastles, whose World TeamTennis season began Tuesday night. (Drew Angerer/The Washington Times)

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associated press Serena Williams reacts during her 6-3, 7-6 (8-6) loss to Marion Bartoli at Wimbledon. Venus Williams also lost, marking the first time the sisters were eliminated from a Grand Slam event on the same day since the French Open in 2008.

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Serena Williams of the United States returns a forehand shot to France's Marion Bartoli during their match at the All England Lawn Tennis Championships at Wimbledon, England, on Monday, June 27, 2011. (AP Photo/Anja Niedringhaus)

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associated press Serena Williams, is attempting to become the first woman to win three consecutive Wimbledon titles since Steffi Graf in 1991-93.

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U.S.'s Serena Williams plays a return to Russia's Vera Zvonareva during their second round single tennis match at the Eastbourne International grass court tournament in Eastbourne, England, Wednesday, June 15, 2011. (AP Photo/Sang Tan)

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FILE - In this July 3, 2010, file photo, Serena Williams of the United States, hits a forehand return to Russia's Vera Zvonareva during their women's singles final at the All England Lawn Tennis Championships at Wimbledon. Williams grabbed her racket and got out on a tennis court on Tuesday, April 12, 2011, which she said was her "first day back" after a series of health problems, including blood clots in her lung. The 13-time Grand Slam singles champion and former No. 1-ranked player has not played an official match since she won the title at Wimbledon in July. (AP Photo/Alastair Grant, File)

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** FILE ** This July 3, 2010, defending champion Serena Williams reacts as she wins a point from Vera Zonareva, during the women's singles final at Wimbledon. She still has blood clots in her lungs but hopes to return to tennis this summer after recovering from a pulmonary embolism. (AP Photo/Jon Super, File)

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Tennis player Serena Williams arrives at the 2011 Elton John Academy Award viewing party in West Hollywood, Calif. on Sunday, Feb. 27, 2011. (AP Photo/Dan Steinberg)

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This June 4, 2010, file photo shows Venus Williams, right, and Serena Williams holding the cup after defeating Czech Republic's Kveta Peschke and Slovenia's Katarina Srebotnik during a women's doubles final for the French Open tennis tournament in Paris. (AP Photo/Christophe Ena)

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FILE - In this July 3, 2010, file photo, Serena Williams of the United States, hits a forehand return to Russia's Vera Zvonareva during their women's singles final at the All England Lawn Tennis Championships at Wimbledon. Williams has pulled out of the U.S. Open because she is still recovering from cutting her foot last month. Her agent and the U.S. Tennis Association confirmed her withdrawal Friday, Aug. 20, 2010. (AP Photo/Alastair Grant, File)

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FILE _ In this July 1, 2010, file photo, Serena Williams, of the United States, makes a backhand return shot to Petra Kvitova, of the Czech Republic, at the All England Lawn Tennis Championships at Wimbledon, England. The WTA Tour says Williams is questionable for the U.S. Open because of her recent foot injury. Williams cut her right foot on broken glass at a restaurant shortly after winning Wimbledon. The tour said last week she needed surgery and would miss three tournaments leading up to the Open. (AP Photo/Alastair Grant, File)

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Serena Williams of the United States celebrates a point win over Russia's Vera Zvonareva during their women's singles final at the All England Lawn Tennis Championships at Wimbledon, Saturday, July 3, 2010. (AP Photo/Alastair Grant)

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ASSOCIATED PRESS Serena Williams acknowledges the crowd, after defeating Petra Kvitova of the Czech Republic in their women's singles semifinal on the Centre Court at the All England Lawn Tennis Championships at Wimbledon, Thursday, July 1, 2010.

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Serena Williams, left, of the U.S. serves as her sister Venus waits at the net during their doubles match against Dominika Cibulkova of Slovakia and Anastasia Pavlyuchenkova of Russia at the All England Lawn Tennis Championships at Wimbledon on Saturday, June 26, 2010. (AP Photo/Sang Tan)

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Serena Williams of the United States gestures with her sister Venus, right, during their doubles match against Russian pair Vera Zvonareva and Elena Vesnina at the All England Lawn Tennis Championships at Wimbledon, Wednesday, June 30, 2010. (AP Photo/Anja Niedringhaus)

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ASSOCIATED PRESS Serena Williams makes a forehand return to Maria Sharapova of Russia, during their women's singles match on the Centre Court at the All England Lawn Tennis Championships at Wimbledon, Monday, June 28, 2010.