The Irvine native and 19-year-old qualifier, who played one semester at USC, wins a 4-hour, 49-minute thriller that ends at nearly 3 a.m. in Melbourne

American teen Learner Tien pulled off the biggest upset so far at the 2025 Australian Open, ousting Russian Daniil Medvedev -- the No. 5 player in the world -- in a 4-hour, 49-minute thriller at Margaret Court Arena.

The Australian Open first round continues with fifth seed Daniil Medvedev, home favourite Alex de Minaur and Italy's Jasmine Paolini among those in action, while Taylor Fritz battles Jenson Brooksby in one of three all-American clashes on Tuesday.

World No. 5 Daniil Medvedev has been fined more than US$76,000 for two separate incidents which occured during his first and second-round matches at the Australian Open.

Daniil Medvedev has copped a pair of hefty fines following his surprise Australian Open exit. The world No. 5 was bundled out in the second round by qualifier Learner Tien – arguably the biggest upset of the tournament thus far.

Daniil Medvedev suffered a shock second-round defeat at the Australian Open, with the Russian ace opting out of his press conference after the late-night loss