Kurumi Nara of Japan plays a return to Anna-Lena Friedsam of Germany during their first round match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 23, 2014.Alastair Grant/The Associated Press
Alejandro Gonzalez of Colombia returns against Jimmy Wang of Chinese Taipei during their first round match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 23, 2014.Sang Tan/The Associated Press
Novak Djokovic of Serbia slips during his men's singles tennis match against Andrey Golubev of Kazakhstan at the Wimbledon Tennis Championships, in London June 23, 2014.STEFAN WERMUTH/Reuters
Li Na of China plays a return to Paula Kania of Poland during their first round match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 23, 2014.Pavel Golovkin/The Associated Press
Paula Kania of Poland is on the ground as she plays a return to Li Na of China during their first round match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 23, 2014.Pavel Golovkin/The Associated Press
Jurgen Melzer of Austria slips during his men's singles tennis match against Jo-Wilfried Tsonga of France at the Wimbledon Tennis Championships, in London June 23, 2014.MAX ROSSI/Reuters
Venus Williams of the U.S. is seen during her women's singles tennis match against Maria-Teresa Torro-Flor of Spain at the Wimbledon Tennis Championships, in London June 23, 2014.TOBY MELVILLE/Reuters
Grigor Dimitrov of Bulgaria hits a return to Ryan Harrison of the U.S. during their men's singles tennis match at the Wimbledon Tennis Championships, in London June 23, 2014.MAX ROSSI/Reuters
Fans ask Grigor Dimitrov of Bulgaria for his autograph after he defeated Ryan Harrison of the U.S. in their men's singles tennis match at the Wimbledon Tennis Championships, in London June 23, 2014.MAX ROSSI/Reuters
Andy Murray of Britain runs to make a return to David Goffin of Belgium during their first round match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 23, 2014.Pavel Golovkin/The Associated Press
A security guard stands under the open roof on Centre Court at the Wimbledon Tennis Championships, in London June 23, 2014.STEFAN WERMUTH/Reuters
Andy Murray of Britain reacts during his men's singles tennis match against David Goffin of Belgium at the Wimbledon Tennis Championships, in London June 23, 2014.STEFAN WERMUTH/Reuters
A boy looks through a gap in canvas screening on Court 12 at the Wimbledon Tennis Championships, in London June 23, 2014.TOBY MELVILLE/Reuters
Dustin Brown of Germany serves to Marcos Baghdatis of Cyprus during their men's singles tennis match at the Wimbledon Tennis Championships, in London June 23, 2014.TOBY MELVILLE/Reuters
Victoria Azarenka of Belarus serves to Mirjana Lucic-Baroni of Croatia during their women's singles tennis match at the Wimbledon Tennis Championships, in London June 23, 2014.MAX ROSSI/Reuters
Victoria Azarenka of Belarus hits a return to Mirjana Lucic-Baroni of Croatia during their women's singles tennis match at the Wimbledon Tennis Championships, in London June 23, 2014.MAX ROSSI/Reuters