Juan Martin del Potro of Argentina celebrates after defeating David Ferrer of Spain in their men's quarter-final tennis match at the Wimbledon Tennis Championships, in London July 3, 2013. [Photo/Agencies]
Juan Martin del Potro of Argentina celebrates after defeating David Ferrer of Spain in their men's quarter-final tennis match at the Wimbledon Tennis Championships, in London July 3, 2013. [Photo/Agencies]