Novak Djokovic, Venus Williams and others in action
Radek Stepanek of the Czech Republic takes a close look at the board showing the result of a line call during his men's singles tennis match against Novak Djokovic of Serbia at the Wimbledon Tennis Championships, in London June 25, 2014.TOBY MELVILLE/Reuters
Bernard Tomic of Australia hits a return to Tomas Berdych of Czech Republic during their men's singles tennis match at the Wimbledon Tennis Championships, in London June 25, 2014.SUZANNE PLUNKETT/Reuters
Andreas Haider-Maurer of Austria reacts during his men's singles tennis match against Marin Cilic of Croatia at the Wimbledon Tennis Championships, in London June 25, 2014.STEFAN WERMUTH/Reuters
Tomas Berdych of Czech Republic reacts during his men's singles tennis match against Bernard Tomic of Australia at the Wimbledon Tennis Championships, in London June 25, 2014.SUZANNE PLUNKETT/Reuters
Novak Djokovic of Serbia reacts to winning the first set during his men's singles tennis match against Radek Stepanek of the Czech Republic at the Wimbledon Tennis Championships, in London June 25, 2014.TOBY MELVILLE/Reuters
Agnieszka Radwanska of Poland returns to Casey Dellacqua of Australia during their women's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Wednesday, June 25, 2014.Ben Curtis/The Associated Press
Victoria Azarenka of Belarus hits a return to Bojana Jovanovski of Serbia during their women's singles tennis match at the Wimbledon Tennis Championships, in London June 25, 2014.MAX ROSSI/Reuters
Novak Djokovic of Serbia serves during his men's singles tennis match against Radek Stepanek of the Czech Republic at the Wimbledon Tennis Championships, in London June 25, 2014.TOBY MELVILLE/Reuters
David Ferrer of Spain reacts during a break in his men's singles tennis match against Andrey Kuznetsov of Russia at the Wimbledon Tennis Championships, in London June 25, 2014.STEFAN WERMUTH/Reuters
Venus Williams of U.S. returns to Kurumi Nara of Japan during their women's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Wednesday, June 25, 2014.Alastair Grant/The Associated Press
Grigor Dimitrov of Bulgaria hits a return in his men's singles tennis match against Luke Saville of Australia at the Wimbledon Tennis Championships, in London June 25, 2014.TOBY MELVILLE/Reuters
An umpire sits on Court 12 at the Wimbledon Tennis Championships, in London June 25, 2014.STEFAN WERMUTH/Reuters
Fans watch through a screen the women's singles tennis match between Misaki Doi of Japan and Ekaterina Makarova of Russia at the Wimbledon Tennis Championships, in London June 25, 2014.STEFAN WERMUTH/Reuters
Casey Dellacqua of Australia serves to Agnieszka Radwanska of Poland during their women's singles tennis match at the Wimbledon Tennis Championships, in London June 25, 2014.TOBY MELVILLE/Reuters
Tara Moore of Britain hits a return to Vera Zvonareva of Russia in their women's singles tennis match at the Wimbledon Tennis Championships, in London June 25, 2014.STEFAN WERMUTH/Reuters
Vera Zvonareva of Russia has a drink during her women's singles tennis match against Tara Moore of Britain at the Wimbledon Tennis Championships, in London June 25, 2014.STEFAN WERMUTH/Reuters