(UPDATED 11 DECEMBER 2024)
- Fonseca reached the quarter-finals at the ATP 500 in Rio de Janeiro in 2024, recording his maiden tour-level win in the process.
- Advanced to his second ATP Tour quarter-final in Bucharest in April 2024.
- Clinched his maiden ATP Challenger Tour trophy in Lexington in August 2024.
- Rose from outside Top 700 in January2024 toNo. 145 in the PIF ATP Rankings by December 2024.
- Qualified for the Next Gen ATP Finals presented by PIF.
- Brazilian madeATP Tour debut at 2023 Rio de Janeiro as 16-year-old wild card.
- Won 2023 US Open boys’ singles event to become World No. 1 in junior rankings after reaching the quarter-finals at Australian Open, Roland Garros and Wimbledon earlier in the season. Became 2023 ITF World Champion.
- Advanced to 2022 Sao Leopoldo Challenger QF as 1,363rd-ranked WC, then achieved career-high No. 826 in January 2023.
- Went 6-0 in singles to lead Brazil to its 1st Junior Davis Cup title in 2022.