Rafael Nadal of Spain Lukas reacts after losing a point to Rosol of the Czech Republic during a second round men's singles match at the All England Lawn Tennis Championships at Wimbledon, England, Thursday, June 28, 2012. (AP Photo/Anja Niedringhaus)
In this photo released by the AELTC, Novak Djokovic of Serbia speaks during a press conference at the All England Lawn Tennis Championships, Wimbledon, England, Sunday, June 24, 2012. (AP Photo/AELTC, Neil Tingle)
Roger Federer hasn't made it past the quarters at Wimbledon since 2009, and he seeks a record-tying seventh win there this week. (AP Photo/dapd/Joerg Sarbach)
Althea Gibson competes at Wimbledon in England in 1956. She was among the more than a million black people who weren't counted in the 1940 census. The records were released April 2. (Associated Press)
Serbia's Novak Djokovic dives for a return shot to Spain's Rafael Nadal during the men's singles final at the All England Lawn Tennis Championships at Wimbledon, England, on Sunday, July 3, 2011. (AP Photo/Kirsty Wigglesworth)
Petra Kvitova of the Czech Republic holds her trophy after defeating Russia's Maria Sharapova in the ladies' singles final at the All England Lawn Tennis Championships at Wimbledon, Saturday, July 2, 2011. (AP Photo/Anja Niedringhaus)
Spain's Rafael Nadal celebrates defeating Britain's Andy Murray in the men's semifinal match at the All England Lawn Tennis Championships at Wimbledon, Friday, July 1, 2011. (AP Photo/Kirsty Wigglesworth)
Spain's Rafael Nadal returns a shot during his men's semifinal match against Britain's Andy Murray at the All England Lawn Tennis Championships at Wimbledon, Friday, July 1, 2011. (AP Photo/Alastair Grant)
Serbia's Novak Djokovic celebrates after defeating France's Jo-Wilfried Tsonga in their men's semifinal at the All England Lawn Tennis Championships at Wimbledon on Friday. Djokovic advanced to his first Wimbledon final and locked up the No. 1 ranking. (AP Photo/Alastair Grant)
ASSOCIATED PRESS
Rafael Nadal, who won Wimbledon in 2008 and 2010, is 31-2 in matches at the tournament since 2006. This year, he is dealing with a painful left foot injury (below).
Russia's Maria Sharapova celebrates defeating Slovakia's Dominika Cibulkova in their match at the All England Lawn Tennis Championships at Wimbledon, Tuesday, June 28, 2011. (AP Photo/Anja Niedringhaus)
France's Jo-Wilfried Tsonga (left), consoles Switzerland's Roger Federer after defeating him in their match at the All England Lawn Tennis Championships at Wimbledon on June 29, 2011. (Associated Press)
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.
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)