Thomaz Bellucci of Brazil returns to Joao Sousa of Portugal during their final match at the Geneva Open tennis tournament in Geneva, Switzerland, 23 May 2015. EPA/MARTIAL TREZZINI

Switzerland’s tennis player Stanislas “Stan” Wawrinka speaks during a press conference prior to the Geneva Open ATP 250 Tennis tournament, in Geneva, Switzerland, 15 May 2016. EPA/LAURENT GILLIERON

Romanian businessman and former professional tennis player Ion Tiriac (L) plays for fun as United States’s tennis player John Isner (R) watches, on a small tennis court in front of the Lake Geneva prior the Geneva Open ATP 250 Tennis tournament, in Geneva, Switzerland, 16 May 2016. EPA/LAURENT GILLIERON

United States’s tennis player John Isner (R) poses with David Ferrer (L) of Spain, after playing for fun in a small tennis court in front of the Lake Geneva prior the Geneva Open ATP 250 Tennis tournament, in Geneva, Switzerland, 16 May 2016. EPA/LAURENT GILLIERON