In his first-ever Grand Slam match, Fonseca defeated World No. 9 Andrey Rublev in straight sets: 7-6(1), 6-3, 7-6(5). The match was evenly contested, but Fonseca was dominant with his power and agility. After the match, Fonseca said, "I think when I ...

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).