Serena Williams of the U.S. celebrates after defeating Zheng Jie of China in their women's singles tennis match at the Wimbledon tennis championships in London June 30, 2012. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS)

Serena Williams of the U.S. holds her trophy after defeating Venus Williams of the U.S. in their Ladies' Singles finals match at the Wimbledon tennis championships in London, July 4, 2009. REUTERS/Toby Melville (BRITAIN SPORT TENNIS) FOR BEST QUALITY AVAILABLE SEE GM1E57S1Q5101 

Serena Williams of the U.S. reacts to a missed point during her match against Amelie Mauresmo of France at the Wimbledon tennis championships in London June 27, 2008. REUTERS/Toby Melville (BRITAIN) 

Venus Williams of the U.S. reaches for the ball during her doubles match with her sister Serena against Marta Domachowska and Agnieszka Radwanska of Poland at the Wimbledon tennis championships in London June 26, 2008. REUTERS/Toby Melville (BRITAIN) 

Thirteenth seed Maria Sharapova of Russia raises the trophy after defeating top seed Serena Williams of the U.S. in their final match at the Wimbledon Tennis Championships in London, July 3, 2004. Seventeen-year-old Sharapova won the match, which was her first Wimbledon and Grand Slam singles title, 6-1 6-4. REUTERS/Kevin Lamarque Pictures of the Year 2004 MD/WS 

Serena Williams of the U.S. returns to Belgium's Els Callens at the
Wimbledon tennis championships, June 28, 2002. Williams went on to win the
tournament, beating her sister Venus in the final. REUTERS/Jeff J Mitchell
PP03050044

JM/AS 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - June 29, 2021 Serena Williams of the U.S. leaves court as she retires from her first round match against Belarus' Aliaksandra Sasnovich after sustaining an injury REUTERS/Peter Nicholls TPX IMAGES OF THE DAY 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - June 27, 2021 Serena Williams of the U.S. reacts during a practice session as she wears a t-shirt displaying an image of herself playing tennis when she was young Pool via REUTERS/David Gray TPX IMAGES OF THE DAY 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 13, 2019 Romania's Simona Halep celebrates winning the final against Serena Williams of the U.S. REUTERS/Carl Recine TPX IMAGES OF THE DAY 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 11, 2019 Serena Williams of the U.S. celebrates winning her semi final match against Czech Republic's Barbora Strycova REUTERS/Carl Recine TPX IMAGES OF THE DAY 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 11, 2019 Serena Williams of the U.S. reacts during her semi final match against Czech Republic's Barbora Strycova REUTERS/Hannah McKay TPX IMAGES OF THE DAY 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 10, 2019 Serena Williams of the U.S. and Britain's Andy Murray during their third round doubles match against Nicole Melichar of the U.S. and Brazil's Bruno Soares REUTERS/Hannah McKay TPX IMAGES OF THE DAY 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 9, 2019 Serena Williams of the U.S. reacts during her quarter final match against Alison Riske of the U.S. REUTERS/Hannah McKay 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 6, 2019 Britain's Andy Murray and Serena Williams of the U.S. in action during their first round mixed doubles match against Chile's Alexa Guarachi and Germany's Andreas Mies REUTERS/Carl Recine TPX IMAGES OF THE DAY 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 14, 2018. Serena Williams of the U.S. reacts during the women's singles final against Germany's Angelique Kerber . REUTERS/Toby Melville TPX IMAGES OF THE DAY 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 14, 2018 Germany's Angelique Kerber holds the trophy after winning the women's singles final against Serena Williams of the U.S. REUTERS/Toby Melville TPX IMAGES OF THE DAY 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 12, 2018 Serena Williams of the U.S. in action during her semi final match against Germany's Julia Goerges REUTERS/Andrew Boyers TPX IMAGES OF THE DAY 

Britain Tennis - Wimbledon - All England Lawn Tennis & Croquet Club, Wimbledon, England - 9/7/16 USA's Serena Williams celebrates winning her womens singles final match against Germany's Angelique Kerber with the trophy REUTERS/Andrew Couldridge 

Britain Tennis - Wimbledon - All England Lawn Tennis & Croquet Club, Wimbledon, England - 9/7/16 USA's Serena Williams celebrates winning her womens singles final match against Germany's Angelique Kerber REUTERS/Andy Rain/Pool 

Britain Tennis - Wimbledon - All England Lawn Tennis & Croquet Club, Wimbledon, England - 4/7/16 USA's Serena Williams reacts after slipping while the umpire looks on during her match against Russia's Svetlana Kuznetsova REUTERS/Andrew Couldridge 

Britain Tennis - Wimbledon - All England Lawn Tennis & Croquet Club, Wimbledon, England - 28/6/16 USA's Serena Williams in action against Switzerland's Amra Sadikovic REUTERS/Stefan Wermuth 

Serena Williams of the U.S.A lifts the trophy after winning her Women's Final match against Garbine Muguruza of Spain at the Wimbledon Tennis Championships in London, July 11, 2015. REUTERS/Toby Melville

Serena Williams of the U.S.A celebrates after winning her Women's Final match against Garbine Muguruza of Spain at the Wimbledon Tennis Championships in London, July 11, 2015. REUTERS/Suzanne Plunkett

Serena Williams of the U.S.A reacts after winning the first set of her Women's Final match against Garbine Muguruza of Spain at the Wimbledon Tennis Championships in London, July 11, 2015. REUTERS/Suzanne Plunkett 

Serena Williams of the U.S.A lifts the trophy after winning her Women's Final match against Garbine Muguruza of Spain at the Wimbledon Tennis Championships in London, July 11, 2015. REUTERS/Suzanne Plunkett

Serena Williams of the U.S.A celebrates after winning her Women's Final match against Garbine Muguruza of Spain at the Wimbledon Tennis Championships in London, July 11, 2015. REUTERS/Suzanne Plunkett

Maria Sharapova of Russia serves during her match against Serena Williams of the U.S.A. at the Wimbledon Tennis Championships in London, July 9, 2015. REUTERS/Toby Melville

Serena Williams of the U.S.A. is applauded by fans during her match against Victoria Azarenka of Belarus at the Wimbledon Tennis Championships in London, July 7, 2015. REUTERS/Stefan Wermuth

Serena Williams of the U.S.A. celebrates after winning her match against Victoria Azarenka of Belarus at the Wimbledon Tennis Championships in London, July 7, 2015. REUTERS/Toby Melville TPX IMAGES OF THE DAY

Serena Williams of the U.S.A. celebrates after winning her match against Victoria Azarenka of Belarus at the Wimbledon Tennis Championships in London, July 7, 2015. REUTERS/Stefan Wermuth

Victoria Azarenka of Belarus reacts during her match against Serena Williams of the U.S.A. at the Wimbledon Tennis Championships in London, July 7, 2015. REUTERS/Toby Melville TPX IMAGES OF THE DAY

Serena Williams of the U.S.A. reacts during her match against Victoria Azarenka of Belarus at the Wimbledon Tennis Championships in London, July 7, 2015. REUTERS/Toby Melville 

Victoria Azarenka of Belarus reacts during her match against Serena Williams of the U.S.A. at the Wimbledon Tennis Championships in London, July 7, 2015. REUTERS/Toby Melville

Serena Williams of the U.S.A. serves during her match against Victoria Azarenka of Belarus at the Wimbledon Tennis Championships in London, July 7, 2015. REUTERS/Stefan Wermuth

Serena Williams of the U.S.A. hits a shot during her match against Venus Williams of the U.S.A. at the Wimbledon Tennis Championships in London, July 6, 2015. REUTERS/Toby Melville

Serena Williams of the U.S.A. reacts during her match against Heather Watson of Britain at the Wimbledon Tennis Championships in London, July 3, 2015. REUTERS/Stefan Wermuth 

Serena Williams of the U.S.A. reacts after missing a point during her match against Timea Babos of Hungary at the Wimbledon Tennis Championships in London, July 1, 2015. REUTERS/Toby Melville TPX IMAGES OF THE DAY

Serena Williams of U.S.A. reacts during her match against Margarita Gasparyan of Russia at the Wimbledon Tennis Championships in London, June 29, 2015. REUTERS/Toby Melville

Serena Williams of the U.S. slips during her women's singles tennis match against Anna Tatishvili of the U.S. at the Wimbledon Tennis Championships, in London June 24, 2014. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SPORT 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 (BRITAIN - Tags: SPORT TENNIS TPX IMAGES OF THE DAY)

Sabine Lisicki of Germany celebrates after defeating Serena Williams of the U.S. during their women's singles tennis match at the Wimbledon Tennis Championships, in London July 1, 2013. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT TENNIS TPX IMAGES OF THE DAY)

Serena Williams of the U.S. reacts to breaking serve in the second set during her women's singles tennis match against Caroline Garcia of France at the Wimbledon Tennis Championships, in London June 27, 2013. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS TPX IMAGES OF THE DAY)

Serena Williams of the U.S. reacts to hitting a shot into the net during her women's singles tennis match against Caroline Garcia of France at the Wimbledon Tennis Championships, in London June 27, 2013. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS)

Serena Williams of the U.S. warms up before her women's singles tennis match against Caroline Garcia of France at the Wimbledon Tennis Championships, in London June 27, 2013. REUTERS/Stefan Wermuth (BRITAIN - Tags: ENTERTAINMENT FASHION SOCIETY SPORT TENNIS)

Serena Williams of the U.S. jumps as she reacts during her women's singles tennis match against Caroline Garcia of France at the Wimbledon Tennis Championships, in London June 27, 2013. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS)

Serena Williams of the U.S. reacts during her women's singles tennis match against Mandy Minella of Luxembourg at the Wimbledon Tennis Championships, in London June 25, 2013. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT TENNIS)

Serena Williams of the U.S. celebrates after defeating Agnieszka Radwanska of Poland in their women's final tennis match at the Wimbledon tennis championships in London July 7, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: SPORT TENNIS) 

Serena Williams of the U.S. celebrates after defeating Victoria Azarenka of Belarus in their women's semi-final tennis match at the Wimbledon tennis championships in London July 5, 2012. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS) 

Serena Williams of the U.S. celebrates after defeating Zheng Jie of China in their women's singles tennis match at the Wimbledon tennis championships in London June 30, 2012. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS TPX IMAGES OF THE DAY) 

Serena Williams of the U.S. leaves the court after being defeated by Marion Bartoli of France at the Wimbledon tennis championships in London June 27, 2011. REUTERS/Toby Melville (BRITAIN - Tags: SPORT TENNIS) 

Serena Williams of the U.S. prepares to serve to Maria Kirilenko of Russia at the Wimbledon tennis championships in London June 25, 2011. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SPORT TENNIS IMAGE OF THE DAY TOP PICTURE) 

Two spectators on Centre Court speak to each other during the match between Serena Williams of the U.S. and Aravane Rezai of France at the Wimbledon tennis championships in London June 21, 2011. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS) 

Serena Williams of the U.S. celebrates defeating Russia's Vera Zvonareva in the womens' singles final at the 2010 Wimbledon tennis championships in London, July 3, 2010. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS) 

Serena Williams of the U.S. celebrates defeating Russia's Vera Zvonareva in the womens' singles final at the 2010 Wimbledon tennis championships in London, July 3, 2010. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS IMAGE OF THE DAY TOP PICTURE) 

Serena Williams of the U.S. celebrates winning a point against Russia's Vera Zvonareva during the women's singles final at the 2010 Wimbledon tennis championships in London, July 3, 2010. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS IMAGE OF THE DAY TOP PICTURE) 

Serena Williams of the U.S. serves to Petra Kvitova of the Czech Republic during their women's semi-final match at the 2010 Wimbledon tennis championships in London, July 1, 2010. REUTERS/Alaistair Grant/Pool (BRITAIN - Tags: SPORT TENNIS) 

Russia's Maria Sharapova prepares to serve to Serena Williams of the U.S. at the 2010 Wimbledon tennis championships in London, June 28, 2010. REUTERS/Toby Melville (BRITAIN - Tags: SPORT TENNIS) 

Serena Williams of the U.S. runs to hit a return to Russia's Anna Chakvetadze at the 2010 Wimbledon tennis championships in London, June 24, 2010. REUTERS/Phil Noble (BRITAIN - Tags: SPORT TENNIS) 

Serena Williams of the U.S. holds her racquet in her ladies doubles match with her sister Venus Williams of the U.S. against Julie Ditty of the U.S. and Renata Voracova of the Czech Republic at the 2010 Wimbledon tennis championships in London, June 22, 2010. REUTERS/Phil Noble (BRITAIN - Tags: SPORT TENNIS)