Jon Isner of the USA in action against Andy Murray of Britain during their men’s single round of 16 match at the French Open tennis tournament at Roland Garros in Paris, France, 29 May 2016. EPA/Caroline Blumberg

Andy Murray of Britain during a break as he plays against Jon Isner of the USA during their men’s single round of 16 match at the French Open tennis tournament at Roland Garros in Paris, France, 29 May 2016. EPA/Caroline Blumberg

Viktor Troicki of Serbia against Stan Wawrinka of Switzerland during their men’s single round of 16 match at the French Open tennis tournament at Roland Garros in Paris, France, 29 May 2016. EPA/ROBERT GHEMENT

Garbine Muguruza of Spain in action against Svetlana Kuznetsova of Russia at their women’s single round of 16 match during the French Open tennis tournament at Roland Garros in Paris, France, 29 May 2016. EPA/ROBERT GHEMENT

Shelby Rogers of the USA celebrates after winning against Irina-Camelia Begu of Romania during their women’s single round of 16 match at the French Open tennis tournament at Roland Garros in Paris, France, 29 May 2016. EPA/ETIENNE LAURENT