![Kaia Kanepi of Estonia reacts after her match point on the final of the Estoril Tennis Open beating Carla Suarez Navarro of Spain in Jamor May 5, 2012. REUTERS/Hugo Correia (PORTUGAL - Kaia Kanepi of Estonia reacts after her match point on the final of the Estoril Tennis Open beating Carla Suarez Navarro of Spain in Jamor May 5, 2012. REUTERS/Hugo Correia (PORTUGAL -](https://c8.alamy.com/comp/2E5X05J/kaia-kanepi-of-estonia-reacts-after-her-match-point-on-the-final-of-the-estoril-tennis-open-beating-carla-suarez-navarro-of-spain-in-jamor-may-5-2012-reutershugo-correia-portugal-tags-sport-tennis-2E5X05J.jpg)
Kaia Kanepi of Estonia reacts after her match point on the final of the Estoril Tennis Open beating Carla Suarez Navarro of Spain in Jamor May 5, 2012. REUTERS/Hugo Correia (PORTUGAL -
![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
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![Li Na, from China, celebrates a point against Canada's Eugenie Bouchard during their match at the Rogers Cup women's tennis tournament, Thursday, Aug. 9, 2012, in Montreal. (AP Photo/The Canadian Press, Paul Li Na, from China, celebrates a point against Canada's Eugenie Bouchard during their match at the Rogers Cup women's tennis tournament, Thursday, Aug. 9, 2012, in Montreal. (AP Photo/The Canadian Press, Paul](https://c8.alamy.com/comp/2HR4XB9/li-na-from-china-celebrates-a-point-against-canadas-eugenie-bouchard-during-their-match-at-the-rogers-cup-womens-tennis-tournament-thursday-aug-9-2012-in-montreal-ap-photothe-canadian-press-paul-chiasson-2HR4XB9.jpg)
Li Na, from China, celebrates a point against Canada's Eugenie Bouchard during their match at the Rogers Cup women's tennis tournament, Thursday, Aug. 9, 2012, in Montreal. (AP Photo/The Canadian Press, Paul
![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,
![British professional tennis player Johanna Konta (Jo Konta) pumps her fist after winning a point during a singles match. Konta is wearing Asics branded tenniswear and is sponsored by Nature Valley. At British professional tennis player Johanna Konta (Jo Konta) pumps her fist after winning a point during a singles match. Konta is wearing Asics branded tenniswear and is sponsored by Nature Valley. At](https://c8.alamy.com/comp/PKW9BD/british-professional-tennis-player-johanna-konta-jo-konta-pumps-her-fist-after-winning-a-point-during-a-singles-match-konta-is-wearing-asics-branded-tenniswear-and-is-sponsored-by-nature-valley-at-the-time-of-the-photograph-konta-was-the-british-1-woman-in-the-wta-rankings-having-recently-reached-4-in-the-world-konta-was-born-in-1991-in-australia-and-switched-her-allegiance-to-the-united-kingdom-in-2012-PKW9BD.jpg)