Stanislas Wawrinka of Switzerland in action against Dmitry Tursunov of Russia during their first round match at the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 19 January 2016. EPA/MAST IRHAM
Carina Witthoeft of Germany returns the ball to Saisai Zheng of China during their first round match of the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 19 January 2016. EPA/LYNN BO BO
Simona Halep of Romania returns the ball to Shuai Zhang of China during their first round match of the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 19 January 2016. EPA/LYNN BO BO
David Ferrer of Spain in action against Peter Gojowczyk of Germany during their first round match at the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 19 January 2016. EPA/MAST IRHAM
Ana Ivanovic of Serbia reacts during her first round match against Tammi Patterson of Australia at the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 19 January 2016. EPA/JULIAN SMITH
Roger Federer of Switzerland gestures during his match against Nikoloz Basilashvili of Georgia on day one of the Australian Open tennis tournament in Melbourne, Australia, 18 January 2016. EPA/LUKAS COCH
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