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

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?

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).

Learner Tien stunned 5th seed Daniil Medvedev in five sets at the 2025 Australian Open on Thursday. The 2nd-round match at the Margaret Court Arena saw Medvedev suffer a shocking defeat. Tien stunned the three-time Australian Open finalist 6-3, 7-6, 6-7, 1-6, 7-6.

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

Learner Tien has announced himself on the world stage with a huge upset victory over world No. 5 Daniil Medvedev, emerging as a new American tennis star

MELBOURNE– Inspired American teenager Learner Tien outlasted three-time Australian Open runner-up Daniil Medvedev to reach the third round with a 6-3 7-6(4) 6-7(8) 1-6 7-6(7) victory in a late-night epic on Thursday.