![Angelique Kerber of Germany hits a forehand in the third set against Venus Williams in their second round match at the 2012 U.S. Open Tennis Championships in Arthur Ashe Stadium at the Angelique Kerber of Germany hits a forehand in the third set against Venus Williams in their second round match at the 2012 U.S. Open Tennis Championships in Arthur Ashe Stadium at the](https://c8.alamy.com/comp/TYN5RF/angelique-kerber-of-germany-hits-a-forehand-in-the-third-set-against-venus-williams-in-their-second-round-match-at-the-2012-us-open-tennis-championships-in-arthur-ashe-stadium-at-the-billie-jean-king-national-tennis-center-in-new-york-city-on-august-30-2012-upijohn-angelillo-TYN5RF.jpg)
Angelique Kerber of Germany hits a forehand in the third set against Venus Williams in their second round match at the 2012 U.S. Open Tennis Championships in Arthur Ashe Stadium at the
![Francesca Schiavone of Italy reacts after winning a point against Galina Voskoboeva of Kazakhstan during their match at the Brisbane International tennis tournament January 3, 2012. REUTERS/Daniel Munoz (AUSTRALIA - Tags: SPORT Francesca Schiavone of Italy reacts after winning a point against Galina Voskoboeva of Kazakhstan during their match at the Brisbane International tennis tournament January 3, 2012. REUTERS/Daniel Munoz (AUSTRALIA - Tags: SPORT](https://c8.alamy.com/comp/2D0N25N/francesca-schiavone-of-italy-reacts-after-winning-a-point-against-galina-voskoboeva-of-kazakhstan-during-their-match-at-the-brisbane-international-tennis-tournament-january-3-2012-reutersdaniel-munoz-australia-tags-sport-tennis-tpx-images-of-the-day-2D0N25N.jpg)
Francesca Schiavone of Italy reacts after winning a point against Galina Voskoboeva of Kazakhstan during their match at the Brisbane International tennis tournament January 3, 2012. REUTERS/Daniel Munoz (AUSTRALIA - Tags: SPORT
![Russia's Maria Sharapova celebrates a point against Spain's Silvia Soler-Espinosa during their Fed Cup World Group first round tennis match in Moscow February 4, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT TENNIS Russia's Maria Sharapova celebrates a point against Spain's Silvia Soler-Espinosa during their Fed Cup World Group first round tennis match in Moscow February 4, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT TENNIS](https://c8.alamy.com/comp/2CYEDXA/russias-maria-sharapova-celebrates-a-point-against-spains-silvia-soler-espinosa-during-their-fed-cup-world-group-first-round-tennis-match-in-moscow-february-4-2012-reutersgrigory-dukor-russia-tags-sport-tennis-2CYEDXA.jpg)
Russia's Maria Sharapova celebrates a point against Spain's Silvia Soler-Espinosa during their Fed Cup World Group first round tennis match in Moscow February 4, 2012. REUTERS/Grigory Dukor (RUSSIA - Tags: SPORT TENNIS
![Britain's Andy Murray reacts after losing a point to Serbia's Novak Djokovic during their men's singles tennis match at the ATP World Tour Finals in the O2 Arena in London November 7, Britain's Andy Murray reacts after losing a point to Serbia's Novak Djokovic during their men's singles tennis match at the ATP World Tour Finals in the O2 Arena in London November 7,](https://c8.alamy.com/comp/2E5RARH/britains-andy-murray-reacts-after-losing-a-point-to-serbias-novak-djokovic-during-their-mens-singles-tennis-match-at-the-atp-world-tour-finals-in-the-o2-arena-in-london-november-7-2012-reutersdylan-martinez-britain-tags-sport-tennis-2E5RARH.jpg)
Britain's Andy Murray reacts after losing a point to Serbia's Novak Djokovic during their men's singles tennis match at the ATP World Tour Finals in the O2 Arena in London November 7,
![Andrea Hlavackova of Czech Republic reacts after losing a point to Serena Williams on day 8 in Arthur Ashe Stadium at the Billie Jean King National Tennis Center in New York City Andrea Hlavackova of Czech Republic reacts after losing a point to Serena Williams on day 8 in Arthur Ashe Stadium at the Billie Jean King National Tennis Center in New York City](https://c8.alamy.com/comp/TYN6AJ/andrea-hlavackova-of-czech-republic-reacts-after-losing-a-point-to-serena-williams-on-day-8-in-arthur-ashe-stadium-at-the-billie-jean-king-national-tennis-center-in-new-york-city-on-september-3-2012-williams-defeated-hlavackova-6-6-0-upijohn-angelillo-TYN6AJ.jpg)
Andrea Hlavackova of Czech Republic reacts after losing a point to Serena Williams on day 8 in Arthur Ashe Stadium at the Billie Jean King National Tennis Center in New York City
![Samantha Stosur of Australia reacts after winning a point in her victory against Marion Bartoli of France during their women's singles semi-final match at the Qatar Open tennis tournament in Doha February Samantha Stosur of Australia reacts after winning a point in her victory against Marion Bartoli of France during their women's singles semi-final match at the Qatar Open tennis tournament in Doha February](https://c8.alamy.com/comp/2CYX45J/samantha-stosur-of-australia-reacts-after-winning-a-point-in-her-victory-against-marion-bartoli-of-france-during-their-womens-singles-semi-final-match-at-the-qatar-open-tennis-tournament-in-doha-february-18-2012-bartoli-pulled-out-of-the-semifinal-when-she-was-trailing-6-3-0-0-reutersfadi-al-assaad-qatar-tags-sport-tennis-2CYX45J.jpg)