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 has become the youngest American man to reach the Australian Open’s third round since Pete Sampras in 1990.

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

Daniil Medvedev of Russia throws his racker during his second round match against Learner Tien of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16 ...

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 ...

American teenager Learner Tien produced arguably the biggest shock of the Australian Open so far as he defeated last year’s ...

Learner Tien stunned the tennis world on Thursday, claiming an upset second round victory over Daniil Medvedev at the Australian Open. The teenage talent beat the No. 5 seed in a thrilling five ...

MELBOURNE, Australia (AP) — Learner Tien, a 19-year-old qualifier from ... upsetting a racket-tossing Daniil Medvedev 6-3, 7-6 (4), 6-7 (8), 1-6, 7-6 (10-7) in a match that began Thursday ...