Images from Thursday's play at Wimbledon
Roger Federer of Switzerland hits a return against Gilles Muller of Luxembourg during their men's singles tennis match on Centre Court at the Wimbledon Tennis Championships in London June 26, 2014.MAX ROSSI/Reuters
John Isner of the U.S. serves to Jarkko Nieminen of Finland during their men's singles tennis match on No.3 court at the Wimbledon Tennis Championships in London June 26, 2014.STEFAN WERMUTH/Reuters
Heather Watson of Britain reacts against Angelique Kerber of Germany during their women's singles tennis match at the Wimbledon Tennis Championships in centre court, London June 26, 2014.MAX ROSSI/Reuters
Lourdes Dominguez Lino of Spain plays a return to Kirsten Flipkens of Belgium during their women's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Thursday, June 26, 2014.Sang Tan/The Associated Press
A security guard is silhouetted against the sky on Court 1 at the Wimbledon Tennis Championships in London June 26, 2014.TOBY MELVILLE/Reuters
Stanislas Wawrinka of Switzerland walks on his knees to pick up his racquet after dropping it during his men's singles tennis match against Lu Yen-Hsun of Taiwan on No.1 court at the Wimbledon Tennis Championships in London June 26, 2014.TOBY MELVILLE/Reuters
Andrea Petkovic of Germany reacts during their women's singles tennis match against Irina-Camelia Begu of Romania on Court 12 at the Wimbledon Tennis Championships in London June 26, 2014.SUZANNE PLUNKETT/Reuters
A fan watches Sabine Lisicki of Germany play against Karolina Pliskova of the Czech Republic in their women's singles tennis match at the Wimbledon Tennis Championships, in London June 26, 2014.STEFAN WERMUTH/Reuters
Jo-Wilfried Tsonga celebrates after winning his men's singles tennis match against Sam Querrey of the United States at the Wimbledon Tennis Championships, in London June 26, 2014.SUZANNE PLUNKETT/Reuters
Rafael Nadal of Spain celebrates as he defeated Lukas Rosol of Czech Republic in their men's singles match on Centre Court at the All England Lawn Tennis Championships in Wimbledon, London, Thursday, June 26, 2014.Pavel Golovkin/The Associated Press
Rafael Nadal of Spain plays a return to Lukas Rosol of the Czech Republic during their men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Thursday, June 26, 2014.Pavel Golovkin/The Associated Press
Serena Williams of U.S. plays a return to Chanelle Scheepers of South Africa during their women's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Thursday, June 26, 2014.Ben Curtis/The Associated Press
Eugenie Bouchard of Canada plays a return to Silvia Soler-Espinosa of Spain during their women's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Thursday, June 26, 2014.Sang Tan/The Associated Press
Milos Raonic of Canada reacts as he breaks the service of Jack Sock of the U.S. during their men's singles tennis match at the Wimbledon Tennis Championships, in London June 26, 2014.STEFAN WERMUTH/Reuters