British player Andy Murray serves the ball to Jeremy Chardy of France during their second round match for the Italian Open tennis tournament at the Foro Italico in Rome, Italy, 13 May 2015. EPA/MAURIZIO BRAMBATTI

Danish Caroline Wozniacki returns the ball to Belorussian Victoria Azarenka during their second round match for the Italian Open tennis tournament at the Foro Italico in Rome, Italy, 13 May 2015. EPA/MAURIZIO BRAMBATTI

Grigor Dimitrov of Bulgaria returns the ball to Fabio Fognini of Italy during their second round match for the Italian Open tennis tournament at the Foro Italico in Rome, Italy, 13 May 2015. EPA/CLAUDIO ONORATI

Martina Hingis and Michael Chang receive the golden racket before the match for the Italian Open tennis tournament between Roger Federer and Pablo Cuevas, at the Foro Italico in Rome, Italy, 13 May 2015. EPA/MAURIZIO BRAMBATTI

Roger Federer of Switzerland returns the ball to Uruguayan Pablo Cuevas, during their match for the Italian Open tennis tournament at the Foro Italico in Rome, Italy, 13 May 2015. EPA/MAURIZIO BRAMBATTI

Rafael Nadal of Spain in action agiainst Marsel Ilhan of Turkey during their second round match for the Italian Open tennis tournament at the Foro Italico in Rome, Italy, 13 May 2015. EPA/MAURIZIO BRAMBATTI