Serena, Venus enter French Open doubles

File - In this Monday, July 30, 2012 file photo, Serena Williams, left, and Venus Williams of the United States clasp hands as they compete against Sorana Cirstea and Simona Halep of Romania in women's doubles at the All England Lawn Tennis Club in Wimbledon, London, at the 2012 Summer Olympics. Serena and Venus Williams are teaming up at the French Open for the first time in three years. The sisters received a doubles wild card from the tournament on Saturday, May 25 2013, allowing them to play in that event after skipping it in 2011 and 2012. (AP Photo/Elise Amendola, file)

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Serena, Venus en... File - In this Monday, July 30, 2012 file photo, Serena Williams, left, and Venus Williams of the United States clasp hands as they compete against Sorana Cirstea and Simona Halep of Romania in women's doubles at the All England Lawn Tennis Club in Wimbledon, London, at the 2012 Summer Olympics. Serena and Venus Williams are teaming up at the French Open for the first time in three years. The sisters received a doubles wild card from the tournament on Saturday, May 25 2013, allowing them to play in that event after skipping it in 2011 and 2012. (AP Photo/Elise Amendola, file)
Nadal could get ... Spain's Rafael Nadal, left, and Russia's Maria Sharapova pose during the draw for the 2013 French Open tennis tournament, at Roland Garros stadium in Paris, Friday May, 24, 2013. (AP Photo/Christophe Ena)
Nadal favored at... FILE - In this April 19, 2013 file photo, Spain's Rafael Nadal plays a return to Grigor Dimitrov of Bulgaria during their quarter final match of the Monte Carlo Tennis Masters tournament in Monaco. Nadal already owns a record seven titles at Roland Garros. The French Open begins Sunday, May 26, 2013. (AP Photo/Lionel Cironneau, File)
Cornet, Bouchard... Eugenie Bouchard, of Canada, returns to Jelena Jankovic, of Serbia, at the Family Circle Cup tennis tournament in Charleston, S.C., Friday, April 5, 2013. Jankovic won 6-2, 6-1, to advance to the semifinals. (AP Photo/Mic Smith)
Nadal beats Fede... Spain's Rafael Nadal waves to fans as he holds the trophy after defeating Switzerland's Roger Federer in the final match of the Italian Open tennis tournament in Rome, Sunday, May 19, 2013. Nadal won 6-1, 6-3. (AP Photo/Andrew Medichini)
Sharapova withdr... Russia's Maria Sharapova returns the ball to US Sloane Stephens during their match at the Italian Open tennis tournament in Rome, Thursday, May 16, 2013. (AP Photo/Andrew Medichini)
Tomic expected t... Bernard Tomic, of Australia, returns to Andy Murray, of Great Britain,during the Sony Open tennis tournament, Saturday, March 23, 2013, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)
Djokovic cruises... Serbia's Novak Djokovic celebrates after defeating Ukraine's Alexandr Dolgopolov during their match at the Italian Open tennis tournament in Rome, Thursday, May 16, 2013. Djokovic beat Dolgopolov 6-1, 6-4 and advanced to the quarterfinals. (AP Photo/Andrew Medichini)
Serena earns 50t... Rafael Nadal from Spain falls to the ground in celebration after winning the final of the Madrid Open tennis tournament against Stanislas Wawrinka from Switzerland, in Madrid Sunday, May 12, 2013. (AP Photo/Andres Kudacki)