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.

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

U.S. 19-year old Learner Tien defeated No. 5 Daniil Medvedev in a fifth set tiebreaker in the Australian Open, making history in Melboune.

Furious Daniil Medvedev trails qualifier Learner Tien, Emma Raducanu issues injury update - Raducanu set up a clash with Iga Swiatek but battled through more injury worries in her win over Amanda Anis

Fonseca beats ninth seed Rublev in men’s draw while Paolini, Rybakina and Raducanu advance in women’s draw on day three.

The outcome was eyebrow-raising because of the wide gulf in experience and accomplishments between the two players at Margaret Court Arena.

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 a racket-tossing Daniil Medvedev 6-3,

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).

American teen Learner Tien pulled off the biggest upset so far at the 2025 Australian Open, ousting Russian Daniil Medvedev -- the No. 5 player in the world -- in a 4-hour, 49-minute thriller at Margaret Court Arena.

The Irvine native and 19-year-old qualifier, who played one semester at USC, wins a 4-hour, 49-minute thriller that ends at nearly 3 a.m. in Melbourne

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