The final match of the day saw American Learner Tien, playing in his first major outside of the U.S. Open, upset No. 5 seed Daniil Medvedev in a five-set classic, 6-3, 7-6, 6-7, 1-6, 7-6, that ended at 2:54 a.m. local time. Medvedev had reached three of the past four Australian Open finals, but could not fend off a ferocious Tien.

Second-round action at the Australian Open has at last concluded, as LWOT recaps a grueling day of men’s tennis on Day 5 that ended at 3 a.m. Read on below

U.S. 19-year old Learner Tien defeated No. 5 Daniil Medvedev in a fifth set tiebreaker in the Australian Open, making history in Melboune.

Former world No. 1 and three-time Australian Open finalist Daniil Medvedev was knocked out of the second round of the Australian Open by debutant Learner Tien.