Serena Williams of the United States eyes the ball as she returns to Daria Kasatkina of Russia during their third round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. 22, 2016.(AP Photo/Aaron Favila)
Lleyton Hewitt of Australia waves to the crowd after his second round loss to David Ferrer of Spain at the Australian Open tennis championships in Melbourne, Australia, Thursday, Jan. 21, 2016.(AP Photo/Andrew Brownbill)
Novak Djokovic of Serbia prepares to make a forehand return to Chung Hyeon of South Korea during their first round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 18, 2016.(AP Photo/Vincent Thian)
Roger Federer of Switzerland celebrates after defeating Alexandr Dolgopolov of Ukraine in their second round match at the Australian Open tennis championships in Melbourne, Australia, Wednesday, Jan. 20, 2016.(AP Photo/Vincent Thian)
Rafael Nadal of Spain warps ice towels around his face during a break in his first round match against compatriot Fernando Verdasco at the Australian Open tennis championships in Melbourne, Australia, Tuesday, Jan. 19, 2016.(AP Photo/Aaron Favila)
Roger Federer of Switzerland takes a drink during his first round match against Nikoloz Basilashvili of Georgia at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. 18, 2016.(AP Photo/Vincent Thian)
A small fire was set to the New Shiloh Christian Church in Melbourne, Florida, and the Arabic phrase "Allahu Akbar" was spray-painted on one of its walls early Monday morning in what church members are calling a possible hate crime. (WKMG Local 6)
Australian Mandy Carter has vowed to ride her stationary bicycle the distance between Melbourne and D.C. in an attempt to get Barack Obama's attention. (Screen grab courtesy of jump-in.com.au)