A raquet being restrung on day one of the Australian Open tennis tournament in Melbourne, Australia, 18 January 2016. EPA/JULIAN SMITH

Samantha Stosur of Australia in action against Kristyna Pliskova of Czech Republic during their first round match for the Australian Open tennis tournament in Melbourne, Australia, 18 January 2016. EPA/LUKAS COCH

Jo-Wilfried Tsonga of France plays a backhand return to Marcos Baghdatis of Cyprus during their first round match on day one of the Australian Open tennis tournament in Melbourne, Australia, 18 January 2016. EPA/TRACEY NEARMY

Tennis fans cool off in the fountain in Garden Square at the Australian Open Tennis tournament in Melbourne, Australia, 18 January 2016. EPA/JULIAN SMITH

Maria Sharapova of Russia plays a shot to Nao Hibino of Japan during their first round match on day one of the Australian Open tennis tournament in Melbourne, Australia, 18 January 2016. EPA/TRACEY NEARMY

Spain’s Roberto Bautista Agut serves to Martin Klizan of Slovakia during the first round match of the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 18 January 2016. EPA/FILIP SINGER