Novak Djokovic of Serbia changes his socks during a break. 塞爾維亞喬科維奇休息期間換襪子

Novak Djokovic of Serbia changes his socks during a break in his fourth round match against Gilles Simon of France at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. 24, 2016.(AP Photo/Aaron Favila)
Djokovic survives 5-setter v Simon to reach quarterfinals - US News
http://www.usnews.com/news/sports/articles/2016-01-24/williams-sharapova-to-meet-in-australian-open-quarterfinals