At just 18, João Fonseca is putting the tennis world on notice, as illustrated by his clinical straight-sets victory over ninth seed Andrey Rublev at the Australian Open.

Brazil have known about Fonseca’s talent known for some time, making his ATP Tour debut at his home tournament in Rio as a 16-year-old wildcard. Fonseca also got the chance to be a hitting partner for Alcaraz and Sinner ahead of the ATP Finals in Turin after winning the US Open junior title in 2023.

After picking up three consecutive wins to qualify for the Australian Open, Joao Fonseca upset Andrey Rublev in the first round. Fonseca entered the match as the ATP World No. 112 and the heavy underdog.

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

Joao Fonseca (No. 113) will meet Andrey Rublev (No. 9) in the Round of 128 at the Australian Open on Saturday, January 11.Rublev’s last match was a win, 6-4, 7-5, over Alejandro Davidovich

Teenage sensation Joao Fonseca announced himself on the big stage by knocking out ninth seed Andrey Rublev in the first round of the Australian Open.

Brazilian teenager Joao Fonseca began his Grand Slam career in spectacular fashion as the qualifier took down Russian ninth seed Andrey Rublev 7-6(1) 6-3 7-6(5) in the first round of the Australian Open on Tuesday.

Joao Fonseca’s sublime triumph against Andrey Rublev at the 2025 Australian Open saw him become one of the youngest male players to defeat an opponent ranked in the top 10. Here, we look at the four youngest players to defeat an opponent in the top 10 of the ATP Rankings in a men’s singles Grand Slam match (age at the beginning of the tournament).

Joao Fonseca, the Brazilian teenage sensation, made a massive statement in his Australian Open debut, securing one of the biggest upsets of the tournament so far by defeating No. 9 seed Andrey Rublev.