João Fonseca definitively introduced himself to the world as the latest teen sensation in men's tennis on Tuesday night, upsetting No. 9 seed Andrey Rublev 7-6 (1), 6-3, 7-6 (5) in the first round of the Australian Open.

In a highly entertaining Australian Open first round match, 18-year-old Joao Fonseca defeated ninth ranked Andrey Rublev.

The qualifier, who reached his first grand slam main draw, faces ninth seed Andrey Rublev in the opening round

Brazilian teenager Joao Fonseca delivered a stunning performance to defeat Andrey Rublev in straight sets in the first round of the 2025 Australian Open. Fonseca prevailed 7-6(1), 6-3, 7-6(5) against Rublev,

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.