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João Fonseca

Brazilian tennis player sharing his life on tour, from the Next Gen ATP Finals title to singles trophies in Buenos Aires and Basel and doubles success at home in Rio.

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João’s happenings, collected from public sources, plus his backstory and Starbook, where fans write.

Known for

Overview

Born: August 21, 2006 · Rio de Janeiro, Brazil
Sport: Professional tennis · Men's singles and doubles
Turned pro: 2024
Junior breakthrough: 2023 US Open boys’ singles champion and ITF Junior World Champion

Mini bio

A fan first.

João grew up near the Rio Open and played on the clay courts at Rio de Janeiro Country Club with his mother. Watching the professionals at his hometown tournament helped him decide to pursue tennis.

The junior breakthrough.

He won the 2023 US Open boys’ singles title and finished that year as the top-ranked boy. The ITF named him Junior World Champion, the first Brazilian junior to receive the award.

Choosing the tour.

A quarter-final run in Rio in February 2024 helped turn possibility into a career. He had committed to the University of Virginia, but announced that month that he would turn professional and give up college eligibility.

From Jeddah to the bigger stages.

His unbeaten 2024 Next Gen ATP Finals run led into a 2025 season with an Australian Open win over Andrey Rublev and singles titles in Buenos Aires and Basel. In 2026, he added a Rio doubles title alongside Marcelo Melo and reached his first Grand Slam quarter-final at Roland-Garros.

Creditschronological, newest first

2026Roland-GarrosSingles quarter-finalist
2026Rio OpenDoubles champion with Marcelo Melo
2025Swiss Indoors BaselSingles champion
2025Argentina OpenSingles champion
2024Next Gen ATP FinalsSingles champion
2023US Open juniorsBoys’ singles champion

Awards

ITF Junior World Champion2023 · Finished the year as the No. 1 boy and became the first Brazilian junior to receive the award.

Quotes

This is where I belong. I want to be in these huge stadiums.João Fonseca, quoted by USOpen.org

After earning his first ATP Tour match win at his hometown Rio Open in February 2024.

Trivia

He watched Rafael Nadal win the 2014 Rio Open from front-row seats.
In 2023, he was a hitting partner at the ATP Finals, practising with Carlos Alcaraz, Daniil Medvedev and Jannik Sinner.
Before turning professional, he had committed to play college tennis at the University of Virginia.