Learner Tien pulled off a massive upset against Daniil Medvedev at the Australian Open. So, who is Tien, the 19-year-old out of California?

Learner Tien, a 19-year-old from California, became the youngest American man to reach the Australian Open's third round since 1990, upsetting No. 5 Daniil Medvedev in five sets.

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

American teenager Learner Tien produced arguably the biggest shock of the Australian Open so far as he defeated last year’s runner-up Daniil Medvedev in five sets, 6-3, 7-6 (4), 6-7 (8), 1-6, 7-6 (7).

The 19-year-old from Irvine, California nearly lost a two-set lead from match point up but held off a late surge from a former world No. 1 to win the biggest match of his career.

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

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.

Learner Tien Beats Daniil Medvedev and Is the Youngest US Man in Australia's 3rd Round Since Sampras MELBOURNE, Australia (AP) — Learner Tien, a 19-year-old qualifier from California ...

a 19-year-old qualifier from California, became the youngest American man to reach the Australian Open's third round since Pete Sampras in 1990, upsetting a racket-tossing Daniil Medvedev 6-3 ...

a 19-year-old qualifier from California, became the youngest American man to reach the Australian Open’s third round since Pete Sampras in 1990, upsetting a racket-tossing Daniil Medvedev 6-3 ...

a 19-year-old qualifier from California, became the youngest American man to reach the Australian Open's third round since Pete Sampras in 1990, upsetting a racket-tossing Daniil Medvedev 6-3 ...

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 ...