Joao Fonseca
2023
| Us Open Junior | [7] | Win |
| J300Collegepark | [1] | 3R |
| Wimbledon Junior | [8] | Quarter |
| J300Roehampton | [8] | Win |
| Roland Garros Junior | [10] | Quarter |
| J500Criciuma | [4] | Final |
| J300Portoalegre | [3] | Quarter |
| Australian Open Junior | [10] | Quarter |
| J300Traralgon | [10] | 3R |
2022
Nation
BRA
Age
18 years old (born in 2006)
World Ranking
ATP Ranking　65th
Year-end Junior World Ranking
- Year-end 2023 1th
- Year-end 2022 44th
- Year-end 2021 439th
- Year-end 2020 1495th
Rival
Learner Tien (1-1)
Iliyan Radulov (2-0)
Federico Cina (2-0)
Cooper Williams (1-1)
Rei Sakamoto (2-0)
Match Details
2023 Us Open Junior
| W | 1R | Mees Rottgering | 6-3 6-4 |
| W | 2R | Patrick Schoen | 6-3 6-2 |
| W | 3R | Fabio De Michele | 6-3 6-4 |
| W | QF | Cooper Williams | 7-6 3-6 6-3 |
| W | SF | Federico Cina | 6-4 3-6 6-4 |
| W | F | Learner Tien | 4-6 6-4 6-3 |
2023 J300Collegepark
| W | 2R | Mikael Arseneault | 6-0 6-1 |
| L | 3R | Alexander Razeghi | 6-3 3-6 3-6 |
2023 Wimbledon Junior
| W | 1R | Jangjun Kim | 7-5 6-2 |
| W | 2R | Charlie Robertson | 6-1 6-4 |
| W | 3R | Rei Sakamoto | 6-3 6-4 |
| L | QF | Henry Searle | 6-7 3-6 |
2023 J300Roehampton
| W | 1R | Mees Rottgering | 6-3 5-7 6-4 |
| W | 2R | Gabriele Vulpitta | 6-3 6-0 |
| W | 3R | Hayden Jones | 6-0 5-7 6-3 |
| W | QF | Arthur Gea | 7-5 7-6 |
| W | SF | Viktor Frydrych | 6-7 6-4 6-3 |
| W | F | Iliyan Radulov | 6-3 6-2 |
2023 Roland Garros Junior
| W | 1R | Loan Lestir | 6-1 6-3 |
| W | 2R | Roy Horovitz | 6-3 6-0 |
| W | 3R | Iliyan Radulov | 3-6 6-2 6-3 |
| L | QF | Learner Tien | 3-6 6-2 1-6 |
2023 J500Criciuma
| W | 1R | Maximo Zeitune | 6-4 6-1 |
| W | 2R | Luis Jose Nakamine | 6-1 6-1 |
| W | 3R | Yuta Tomida | 6-3 3-6 2-0 |
| W | QF | Federico Cina | 6-1 6-4 |
| W | SF | Rei Sakamoto | 6-4 6-2 |
| L | F | Yaroslav Demin | 2-6 2-6 |
2023 J300Portoalegre
| W | 1R | Hoyoung Roh | 6-1 6-1 |
| W | 2R | Carlo Alberto Caniato | 7-6 7-5 |
| L | QF | Danil Panarin | 3-6 6-2 2-6 |
2023 Australian Open Junior
| W | 1R | Aryan Shah | 6-1 6-2 |
| W | 2R | Vit Kalina | 7-5 6-3 |
| W | 3R | Rei Sakamoto | 6-3 6-4 |
| L | QF | Alexander Blockx | 7-6 6-7 3-6 |
2023 J300Traralgon
| W | 1R | Lennon Roark Jones | 6-1 6-2 |
| W | 2R | Thomas Nicholas Gadecki | 6-7 6-3 6-1 |
| L | 3R | Cooper Williams | 4-6 6-1 4-6 |
2022 Us Open Junior
| L | 1R | Jakub Nicod | 7-5 6-7 1-6 |
2022 Wimbledon Junior
| W | 1R | Lautaro Midon | 7-6 6-4 |
| L | 2R | Sebastian Gorzny | 6-2 3-6 4-6 |
2022 Roland Garros Junior
| W | 1R | Kalin Ivanovski | 6-7 6-4 6-2 |
| W | 2R | Adolfo Daniel Vallejo | 6-3 6-4 |
| L | 3R | Gabriel Debru | 5-7 3-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 9482, Number of registered players: 4,990, Number of registered results: 217,154