Sunlight streams into Rod Laver Arena during the fourth round match between Novak Djokovic of Serbia and Chung Hyeon of South Korea at the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 22 January 2018. EPA-EFE/NARENDRA SHRESTHA
Roger Federer of Switzerland in action against Marton Fucsovics of Hungary during their fourth round match on day eight of the Australian Open tennis tournament, in Melbourne, Victoria, Australia, 22 January 2018. EPA-EFE/LUKAS COCH
Barbora Strycova of Czech Republic in action during her fourth round match against Karolina Pliskova of Czech Republic at the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 22 January 2018. EPA-EFE/MARK CRISTINO
Tennys Sandgren of the United States in action against Dominic Thiem of Austria during round four on day eight of the Australian Open tennis tournament in Melbourne, Victoria, Australia, 22 January 2018. EPA-EFE/TRACEY NEARMY
Caroline Garcia of France in action during her fourth round match against Madison Keys of USA at the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 22 January 2018. EPA-EFE/MAST IRHAM
Novak Djokovic of Serbia in action during his fourth round match against Chung Hyeon of South Korea at the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 22 January 2018. EPA-EFE/MARK CRISTINO
