Learner Tien and Alex Michelsen were born about 15 months apart and first crossed paths a decade ago when they were playing in Southern California tennis tournaments ...

Learner Tien, a 19-year-old qualifier from California, became the youngest American man to reach the Australian Open's third ...

Learner Tien celebrated his shock Australian Open victory over three-times runner-up Daniil Medvedev in true teenage fashion, ...

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

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

There are six American men and five American women in the third round. Tommy Paul, Coco Gauff and Jessica Pegula all play Thursday. No. 17 Frances Tiafoe, a two-time U.S. Open semifinalist, was upset ...

A teenager, Learnen Tien, came to Melbourne with a 0-3 score at Majors. The 19-year-old American qualified for the Australian ...