Learner Tien, a 19-year-old qualifier from California, notched the biggest upset of the 2025 Australian Open to date by beating No. 5 seed and 2024 finalist, Daniil Medvedev, in five sets. Tien won 6-3,

The outcome was eyebrow-raising because of the wide gulf in experience and accomplishments between the two players at Margaret Court Arena.

The 19-year-old American upset fifth-seeded Daniil Medvedev in a five-set Australian Open marathon that lasted nearly five hours.

Learner Tien won again at the Australian Open today, knocking out France’s Corentin Moutet to progress to the fourth round of the men’s singles.

At the age of 19, Learner Tien defeated Daniil Medvedev in a five-set thriller that finished just before 3 a.m. in Melbourne.

Learner Tien, 19, became the youngest American man to reach the Australian Open's third round since Pete Sampras in 1990.

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.

Last year's runner-up Daniil Medvedev was dumped out in the Australian Open second round by 19-year-old qualifier Learner Tien in a massive Melbourne shock at close to 3 a.m. Friday.