Davydenko loses fourth straight match

Russia's Nikolay Davydenko reacts after losing a point against France's Richard Gasquet during their final match at Qatar ATP Open Tennis tournament in Doha, Qatar, Saturday, Jan. 5, 2013. (AP Photo/Osama Faisal)

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Davydenko loses ... Russia's Nikolay Davydenko reacts after losing a point against France's Richard Gasquet during their final match at Qatar ATP Open Tennis tournament in Doha, Qatar, Saturday, Jan. 5, 2013. (AP Photo/Osama Faisal)
Top-seeded Barto... Marion Bartoli, of France, returns a shot to Chanelle Scheepers, of South Africa, at the BNP Paribas Open tennis tournament, Friday, March 8, 2013, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
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)
Murray injures b... Britain's Andy Murray wipes his face during a pause of a match with Spain's Marcel Granollers during their match at the Italian Open tennis tournament in Rome, Wednesday, May 15, 2013. Murray has retired from his second-round match with Marcel Granollers in the second round of the Italian Open. (AP Photo/Andrew Medichini)
Murray retires f... Britain's Andy Murray returns the ball to Spain's Marcel Granollers during their match at the Italian Open tennis tournament in Rome, Wednesday, May 15, 2013. (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)
Nadal rallies by... Rafael Nadal from Spain celebrates a point during the match against Benoit Paire from France at the Madrid Open tennis tournament, in Madrid, Wednesday, May 8, 2013. (AP Photo/Andres Kudacki)
Singapore to hos... Serena Williams of the U.S., left, holds her trophy after her tennis victory against Maria Sharapova of Russia, right, on the final of the WTA Championships in Istanbul, Turkey, Sunday, Oct. 28, 2012. (AP Photo)
Tomic's father b... FILE - In this Saturday, Jan. 12, 2013 file photo Australia's Bernard Tomic plays a shot to Kevin Anderson of South Africa during the men's final at the Sydney International tennis tournament in Sydney, Australia. Bernard Tomic's hitting partner Thomas Drouet has called for the father of the Australian tennis player to be banned after he was allegedly assaulted on Saturday May 4, 2013. John Tomic has been charged with assault after allegedly headbutting Drouet ahead of this week's Madrid Open. (AP Photo/Rick Rycroft, File)
Federer, Serena ... Roger Federer from Switzerland returns the ball during the match against Radek Stepanek from Czech Republic at the Madrid Open tennis tournament, in Madrid, Tuesday, May 7, 2013. (AP Photo/Andres Kudacki)
Venus, Roddick b... Venus Williams returns to Madison Keys at the Family Circle Cup tennis tournament in Charleston, S.C., Friday, April 5, 2013. Williams won 6-4, 6-4. (AP Photo/Mic Smith)
Nadal, ailing Dj... Novak Djokovic of Serbia plays a return to Mikhail Youzhny of Russia during their match of the Monte Carlo Tennis Masters tournament in Monaco, Wednesday, April 17, 2013. (AP Photo/Lionel Cironneau)