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?

The Australian Open first round continues with fifth seed Daniil Medvedev, home favourite Alex de Minaur and Italy's Jasmine Paolini among those in action, while Taylor Fritz battles Jenson Brooksby in one of three all-American clashes on Tuesday.

We wrap up the first round of the Australian Open on Day 3, with 20 men’s matches on the schedule. As always, our writers here at LastWordOnTennis share their thoughts on every single match with you.

Teenage qualifier Learner Tien stunned last year's Australian Open runner-up Daniil Medvedev after Jannik Sinner roared back to take his place in the third round.

John Cain Arena never really had a chance to erupt all day; the loudest applause occurred when a fan successfully guessed the changeover trivia.

In Melbourne, tennis players Daniil Medvedev, Taylor Fritz, and Elena Rybakina advanced to the next rounds with notable performances. Medvedev overcame frustrations, Fritz aims to end an American men's Grand Slam drought,

Three-time losing finalist Daniil Medvedev and home favourite Alex de Minaur set out on the road to Australian Open glory Tuesday while rampant fourth seed Taylor Fritz was among the

Naomi Osaka ’s return to Grand Slam competition ended prematurely on Friday, as the two-time Australian Open champion was forced to retire from her third-round match against Belinda Bencic due to a strained abdominal muscle. Osaka had dropped the opening set in a tiebreaker, 7-6 (3), before informing the chair umpire she could no longer continue.

Daniil Medvedev, beaten in the Melbourne final last year by Sinner, faces Learner Tien, 19, of the United States in a later match. Sinner dropped a set for the first time in 14 matches when he lost the opener to Australian wildcard Tristan Schoolkate.

Teenage qualifier Learner Tien stunned last year's Australian Open runner-up Daniil Medvedev in an epic match ending at nearly 3:00 am Friday after defending champion Jannik Sinner roared back to

MELBOURNE—Iga Swiatek romped into a third-round showdown with Emma Raducanu in the Australian Open on Thursday while Taylor Fritz was just as emphatic in