Australian Open

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, AustraliaRead more

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. Read more

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, AustraliaRead more