The 19-year-old who was a late qualifier to the Grand Slam secured the biggest win of his young career on Thursday

Brazilian teenager Joao Fonseca stunned ninth seed Andrey Rublev in a major Australian Open shock on Tuesday as racquet-smashing 2024 finalist Daniil Medvedev narrowly avoided the same fate.

MELBOURNE - Learner Tien celebrated his shock Australian Open victory over three-times runner-up Daniil Medvedev in true teenage fashion, seeking out a well-earned pizza after edging a five-set thriller to progress to the third round.

Learner Tien, 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 Daniil Medvedev in five sets Thursday.

At this year’s Australian Open, teens have knocked out three top 10 players in the men’s singles. In contrast, there hasn’t been much of a disruption in the women’s game

Reigning French Open and Wimbledon champion Alcaraz certainly knows what it takes to make an impact from a young age

A series of jaw-dropping upsets of top 10 players at the Australian Open by fearless teenagers has fuelled excitement at the future of men's tennis as the old guard fades into history.

Former world No. 1 and three-time Australian Open finalist Daniil Medvedev was knocked out of the second round of the Australian Open by debutant Learner Tien.

Alex de Minaur admits he faces a "battle" to progress to the fourth round of the Australian Open on Saturday, despite Novak Djokovic predicting big things from the home favourite at Melbourne Park. De Minaur is yet to drop a set at his home slam but faces his sternest test yet in a third round clash against Argentina's World No.

Corentin Moutet vs Learner Tien 2025 Australian Open match preview: TV & streaming details, ticket information, free tips &

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.