Hyeon Chung, a 21 year old South Korean currently ranked 58th in the world, upset former world No. 1 and six-time Australian Open champion Novak Djokovic in straight sets during the fourth round of the tournament on Jan. 22. Chung, who won the 2017 ATP Next Gen Finals, became the first Korean tennis player to reach the quarterfinals of a Grand Slam event. Following his victory, Chung told reporters, “I don’t know how I did that. I’m just trying to copy Novak, because he’s my idol. It’s a dream come true tonight.” Chung will face American Tennys Sandgren in his quarterfinal match on Jan. 24. (provided by Korea Tennis Association)