Spanish Rafael Nadal serves the ball to Australian Nick Kyrgios during their third round match for the Italian Open Tennis Tournament at the Foro Italico in Rome, Italy, 12 May 2016. EPA/CLAUDIO ONORATI

Serena Williams of the US serves the ball to her compatriot Christina McHale during their third round match for the Italian Open tennis tournament at the Foro Italico in Rome, Italy, 12 May 2016. EPA/ETTORE FERRARI

Switzerland’s Roger Federer returns the ball to Austria’s Dominic Thiem during their third round match of the Italian Open tennis tournament at the Foro Italico in Rome, Italy, 12 May 2016. EPA/CLAUDIO ONORATI

Eugenie Bouchard of Canada returns the ball to Angelique Kerber of Germany during their second round match for the Italian Open tennis tournament at the Foro Italico in Rome, Italy, 11 May 2016. EPA/ETTORE FERRARI

Australian Nick Kyrgios during his third round match against Spanish Rafael Nadalat the Italian Open tennis tournament at the Foro Italico in Rome, Italy, 12 May 2016. EPA/CLAUDIO ONORATI