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Serena Williams of United States of America plays a forehand during her Ladies' Singles fourth round match against Sabine Lisicki of Germany on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 172055134 )

Serena Williams of United States of America serves during her Ladies' Singles fourth round match against Sabine Lisicki of Germany on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 172055141 )

Sabine Lisicki of Germany serves during her Ladies' Singles fourth round match against Serena Williams of United States of America on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 172055222 )

Serena Williams of the United States reacts during her match against Sabine Lisicki of Germany in a Women's singles at the All England Lawn Tennis Championships in Wimbledon, London, Monday, July 1, 2013. (AP Photo/Alastair Grant) ( Britain Wimbledon Tennis )

Serena Williams of United States of America in action during her Ladies' Singles fourth round match against Sabine Lisicki of Germany on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 172055149 )

Serena Williams of the U.S. falls after diving for a shot during her women's singles tennis match against Sabine Lisicki of Germany at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Toby Melville ( TENNIS-WIMBLEDON/ )

Sabine Lisicki of Germany celebrates a point during her Ladies' Singles fourth round match against Serena Williams of United States of America on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 172061688 )

Serena Williams of the U.S. reacts during her women's singles tennis match against Sabine Lisicki of Germany at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Toby Melville ( TENNIS-WIMBLEDON/ )

Germany's Sabine Lisicki celebrates beating US player Serena Williams during their fourth round women's singles match on day seven of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on July 1, 2013. Lisicki won 6-2, 1-6, 6-4. CARL COURT/AFP/Getty Images ( 521053405 )

Serena Williams of United States of America looks dejected during her Ladies' Singles fourth round match against Sabine Lisicki of Germany on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 172055377 )

Sabine Lisicki of Germany celebrates a point during her Ladies' Singles fourth round match against Serena Williams of United States of America on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 172055175 )

Sabine Lisicki of Germany reacts during her women's singles tennis match against Serena Williams of the U.S. at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Toby Melville ( TENNIS-WIMBLEDON/ )

Sabine Lisicki of Germany celebrates match point during her Ladies' Singles fourth round match against Serena Williams of United States of America on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 172055163 )

Sabine Lisicki of Germany celebrates after beating Serena Williams of the United States in a Women's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, July 1, 2013. (AP Photo/Alastair Grant) ( Britain Wimbledon Tennis )

Serena Williams of the United States reacts during her Women's singles match against Sabine Lisicki of Germany at the All England Lawn Tennis Championships in Wimbledon, London, Monday, July 1, 2013. (AP Photo/Alastair Grant) ( Britain Wimbledon Tennis )

Sabine Lisicki of Germany (L) celebrates after defeating Serena Williams of the U.S. (R) during their women's singles tennis match at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Eddie Keogh ( TENNIS-WIMBLEDON/ )

Fans of Laura Robson of Great Britain pose with messages printed on their vests before her Ladies' Singles fourth round match against Kaia Kanepi of Estonia on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Clive Brunskill/Getty Images) ( 172046830 )

Spectators pose before Laura Robson of Great Britain's Ladies' Singles fourth round match against Kaia Kanepi of Estonia on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Clive Brunskill/Getty Images) ( 172046834 )

Roberta Vinci of Italy plays a backhand during her Ladies' Singles fourth round match against Na Li of China on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Dennis Grombkowski/Getty Images) ( 172046890 )

Juan Martin Del Potro of Argentina reacts during the Gentlemen's Singles fourth round match against Andreas Seppi of Italy on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Clive Brunskill/Getty Images) ( 172065473 )

Tomas Berdych of Czech Republic serves during the Gentlemen's Singles fourth round match against Bernard Tomic of Australia on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Clive Brunskill/Getty Images) ( 172067914 )

Tennis fans cheer in front of the big screen at Murray Mount as Britain's Andy Murray beats Russia's Mikhail Youzhny in their fourth round men's singles match on day seven of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on July 1, 2013. Murray won 6-4, 7-6, 6-1. BEN STANSALL/AFP/Getty Images ( 521058031 )

Andy Murray of Great Britain serves during the Gentlemen's Singles fourth round match against Mikhail Youzhny of Russia on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 172068623 )

Novak Djokovic of Serbia plays a forehand during the Gentlemen's Singles fourth round match against Tommy Haas of Germany on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 172068875 )

Tommy Haas of Germany plays a forehand during the Gentlemen's Singles fourth round match against Novak Djokovic of Serbia on day seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 172068884 )

Kaia Kanepi of Estonia celebrates after defeating Laura Robson of Britain in their women's singles tennis match at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Suzanne Plunkett ( TENNIS-WIMBLEDON/ )

David Ferrer of Spain celebrates after defeating Ivan Dodig of Croatia in their men's singles tennis match at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Stefan Wermuth ( TENNIS-WIMBLEDON/ )

Tsvetana Pironkova of Bulgaria slips during her women's singles tennis match against Agnieszka Radwanska of Poland at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Stefan Wermuth ( TENNIS-WIMBLEDON/ )

Fernando Verdasco of Spain celebrates after defeating Kenny De Schepper of France in their men's singles tennis match at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Eddie Keogh ( TENNIS-WIMBLEDON/ )

Andy Murray of Britain leans on a wall after missing a shot in his men's singles tennis match against Mikhail Youzhny of Russia at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Eddie Keogh ( TENNIS-WIMBLEDON/ )

Mikhail Youzhny of Russia hits a shot into the net during his men's singles tennis match against Andy Murray of Britain at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Toby Melville (BRITAIN - Tags: SPORT TENNIS) ( TENNIS-WIMBLEDON/ )

Andy Murray of Britain leans over the net in his men's singles tennis match against Mikhail Youzhny of Russia at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Toby Melville ( TENNIS-WIMBLEDON/ )

Bernard Tomic of Australia reacts during his men's singles tennis match against Tomas Berdych of the Czech Republic at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Suzanne Plunkett ( TENNIS-WIMBLEDON/ )

Bernard Tomic of Australia hits a return to Tomas Berdych of the Czech Republic in their men's singles tennis match at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Suzanne Plunkett ( TENNIS-WIMBLEDON/ )

Tommy Haas of Germany returns to Novak Djokovic of Serbia during a Men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, July 1, 2013. (AP Photo/Anja Niedringhaus) ( Britain Wimbledon Tennis )

Jerzy Janowicz of Poland sits in his chair during a change of ends break as he plays Jurgen Melzer of Austria during their Men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, July 1, 2013. (AP Photo/Anja Niedringhaus) ( Britain Wimbledon Tennis )

Croatia's Ivan Dodig slips after hitting a return against Spain's David Ferrer during their fourth round men's singles match on day seven of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on July 1, 2013. BEN STANSALL/AFP/Getty Images ( 521049383 )

Czech Republic's Petra Kvitova celebrates winning the first set against Spain's Carla Suarez Navarro during their fourth round women's singles match on day seven of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on July 1, 2013. Kvitova won 7-5, 6-3. GLYN KIRK/AFP/Getty Images ( 521050118 )

Poland's Jerzy Janowicz celebrates beating Austria's Jurgen Melzer during their fourth round men's singles match on day seven of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on July 1, 2013. Janowicz won 3-6, 7-6, 6-4, 4-6, 6-4. GLYN KIRK/AFP/Getty Images ( 521054039 )

Britain's Andy Murray (R) shakes hands with Russia's Mikhail Youzhny (L) after Murray won their fourth round men's singles match on day seven of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on July 1, 2013. Murray won 6-4, 7-6, 6-1. CARL COURT/AFP/Getty Images ( 521057850 )