All smiles for Hyeon Chung, who becomes the first Korean to reach a Grand Slam semi with his 6-4, 7-6, 6-3 win over Sandgren at the Australian Open. Drop a 🇰🇷 in the comments for this historic moment! 📸: @hyeon519 #usopen #hyeonchung #nextgenatp #atp #melbourne #tennis #protennis #instatennis #instasports #instawow