Australian Open

Tennis - Australian Open - Melbourne Park, Melbourne, Australia

Issei Kato/Reuters

Fans wait for autographs after Slovakia’s Dominika Cibulkova won her Women’s singles second round match against Taiwan’s Hsieh Su-Wei. Photo Issei Kato/Reuters

ennis - Australian Open - Melbourne Park, Melbourne, Australia - 18/1/17 Victor Estrella Burgos of the Dominican Republic in action during his Men's singles second round match against Australia's Bernard Tomic. REUTERS/Jason Reed

Jason Reed/Reuters

Victor Estrella Burgos of the Dominican Republic in action during his Men’s singles second round match against Australia’s Bernard Tomic at the Australian Open, Melbourne, Australia. Photo Jason Reed/Reuters

Serbia's Novak Djokovic makes a backhand return to Spain's Fernando Verdasco during their first round match at the Australian Open tennis championships in Melbourne, Australia, Tuesday, Jan. 17, 2017. (AP Photo/Andy Brownbill)

Andy Brownbill/AP

Serbia’s Novak Djokovic makes a backhand return to Spain’s Fernando Verdasco during their first round match at the Australian Open tennis championships in Melbourne, Australia. Photo Andy Brownbill/AP

Tennis - Australian Open - Melbourne Park, Melbourne, Australia

Jason Reed/Reuters

Coco Vandeweghe of the U.S. signs autographs after winning the Women’s singles first round match in the Australian Open against Italy’s Roberta Vinci. Photo Jason Reed/Reuters

Williams of the U.S. serves during her quarter-final match against Russia's Sharapova at the Australian Open tennis tournament at Melbourne Park...Serena Williams of the U.S. serves during her quarter-final match against Russia's Maria Sharapova at the Australian Open tennis tournament at Melbourne Park, Australia, January 26, 2016. REUTERS/Thomas Peter       TPX IMAGES OF THE DAY

Thomas Peter/Reuters

Serena Williams of the U.S. serves during her quarter-final match against Russia’s Maria Sharapova at the Australian Open tennis tournament at Melbourne Park, Australia

Novak Djokovic of Serbia prepares to serve to  Andreas Seppi of Italy during their third round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. 22, 2016.(AP Photo/Andrew Brownbill)

Andrew Brownbill/AP

Novak Djokovic of Serbia prepares to serve to Andreas Seppi of Italy during their third round match at the Australian Open tennis championships in Melbourne, Australia

Canada's Raonic signs autographs after winning his second round match against Spain's Robredo at the Australian Open tennis tournament at Melbourne Park...Canada's Milos Raonic signs autographs after winning his second round match against Spain's Tommy Robredo at the Australian Open tennis tournament at Melbourne Park, Australia, January 21, 2016. REUTERS/Issei Kato

Issei Kato/Reuters

Canada’s Milos Raonic signs autographs after winning his second round match against Spain’s Tommy Robredo at the Australian Open tennis tournament at Melbourne Park, Australia 

Germany's Brown plays during his doubles match at the Australian Open tennis tournament at Melbourne Park...Germany's Dustin Brown plays during his doubles match at the Australian Open tennis tournament at Melbourne Park, Australia, January 20, 2016. REUTERS/Jason O'Brien

Jason O'Brien/Reuters

Germany’s Dustin Brown plays during his doubles match at the Australian Open tennis tournament at Melbourne Park, Australia

Jason Reed/Reuters

Serbia’s Novak Djokovic serves during his first round match against South Korea’s Hyeon Chung at the Australian Open tennis tournament at Melbourne Park, Australia 

Grigor Dimitrov of Bulgaria is silhouetted as he plays Rafael Nadal of Spain during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.

Aijaz Rahi/AP

Grigor Dimitrov of Bulgaria is silhouetted as he plays Rafael Nadal of Spain during their quarter final at the Australian Open tennis championship in Melbourne, Australia

Serena Williams of the U.S. serves to Daniela Hantuchova of Slovakia during their women's singles match at the Australian Open 2014 tennis tournament in Melbourne...Serena Williams of the U.S. serves to Daniela Hantuchova of Slovakia during their women's singles match at the Australian Open 2014 tennis tournament in Melbourne January 17, 2014.

Jason Reed/Reuters

Serena Williams of the US serves to Daniela Hantuchova of Slovakia during their women’s singles match at the Australian Open 2014 tennis tournament in Melbourne. Williams won 6-3 6-3. 

Tennis fans protect themselves from the sun during a first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.

Aaron Favila/AP

Tennis fans protect themselves from the sun during a first round match at the Australian Open tennis championship in Melbourne, Australia