@hyeon519 is making huge strides in Melbourne as he becomes the 1st Korean to reach the quarterfinal stage of a Grand Slam after defeating 6-time Australian Open champion Novak Djokovic last night. Let's take a look back when we first saw this rising star hit the courts in Flushing Meadows! 🎥: 2015 #USOpen 🆚 Wawrinka. _ #tennis #spotlight #chung #hyeonchung #grandslam #asiantennis #southkorea #nextgenatp #instatennis #tennispro