Australian Open: South Korea’s Hyeon Chung upsets fourth seed Alexander Zverev 5-7, 7-6, 2-6, 6-3, 6-0 in the third round.

Australian Open: South Korea’s Hyeon Chung upsets fourth seed Alexander Zverev 5-7, 7-6, 2-6, 6-3, 6-0 in the third round.