The American, ranked 121 in the world, overcame the former world number one 6-3, 7-6 (7/4), 6-7 (8/10), 1-6, 7-6 (10/7) after four hours and 48 minutes of intense action at Margaret Court Arena.
The US ban of TikTok has some feeling glum, while a hot-temper in the Aussie heat has burnt a hole in Medvedev's pocket. Here are the five quick hits from day eight of the Australian Open.