Spain’s Rafael Nadal (R) with his coach and uncle Toni Nadal during a training session at the Queens Club in London, Britain, 17 June 2015, where currently the Aegon tennis championships are taking place. Nadal was knocked out in the first round of the tournament on June 16th. EPA/ANDY RAIN

Giles Simon of France returns to Australia’s Thanasi Kokkinakis during a Aegon tennis championships match at the Queens Club in London, Britain, 17 June 2015. EPA/ANDY RAIN

Switzerland’s Stan Wawrinka returns to Kevin Anderson of South Africa during their second round match for the Aegon tennis championships at the Queens Club in London, Britain, 17 June 2015. EPA/ANDY RAIN

Steve Johnson of the USA in action during the round of 16 match against Florian Mayer of Germany at the ATP tennis tournament in Halle, Germany, 17 June 2015. EPA/Maja Hitij

Britain’s Andy Murray during a training session at the Aegon tennis championships at the Queens Club in London, Britain, 17 June 2015. EPA/ANDY RAIN