Rei Sakamoto
2024
| Us Open Junior | [3] | Semi |
| J300Collegepark | [1] | 3R |
| Roland Garros Junior | [1] | Quarter |
| Australian Open Junior | [4] | Win |
| J300Traralgon | [4] | Win |
2023
| J500Plantation | [4] | 2R |
| J500Osaka | [3] | Semi |
| Us Open Junior | 3R | |
| J300Collegepark | [6] | Quarter |
| Wimbledon Junior | [11] | 3R |
| J300Roehampton | [11] | 2R |
| Roland Garros Junior | [12] | 2R |
| J500Milan | [10] | 1R |
| J300Santacrocesullarno | [3] | 2R |
| J500Offenbach | [6] | 2R |
| J300Beaulieu-Sur-Mer | [2] | Semi |
| J500Criciuma | [1] | Semi |
| J300Portoalegre | [2] | 1R |
| Australian Open Junior | [6] | 3R |
| J300Traralgon | [6] | Quarter |
2022
| Japlantation | [8] | Quarter |
| J1Bradenton | [3] | 1R |
| Jaosaka | [2] | 3R |
| Us Open Junior | 2R | |
| Usopenjuniorchampionships | 2R | |
| J1Repentigny | [3] | 3R |
| J1Collegepark | [2] | 3R |
| Japretoria | [1] | Quarter |
| J1Durban | [1] | Final |
| J1Roehampton | 1R | |
| J1Nottingham | [9] | 2R |
| J2Gladbeck | [1] | 2R |
| J1Bamberg | [5] | Semi |
| J1Charleroi-Marcinelle | Semi | |
| Jamilan | 1R | |
| J1Santacrocesullarno | 1R | |
| J2Istres | Win | |
| J2Capdail | Final | |
| J1Sandiego | [14] | 2R |
| J3Cancun | Win | |
| J3Tampico | Win | |
| J5Monterrey | [4] | Win |
Age
19 years old (born in 2006)
World Ranking
ATP Ranking　206th
Year-end Junior World Ranking
- Year-end 2024 5th
- Year-end 2023 18th
- Year-end 2022 33th
- Year-end 2021 779th
Match Details
2024 Us Open Junior
| W | 1R | Izan Almazan Valiente | 6-3 6-1 |
| W | 2R | Henry Bernet | 7-6 6-4 |
| W | 3R | Timofei Derepasko | 6-4 6-4 |
| W | QF | Atakan Karahan | 6-3 6-3 |
| L | SF | Rafael Jodar | 3-6 1-6 |
2024 J300Collegepark
| W | 2R | Calvin Baierl | 6-2 |
| L | 3R | Charlie Robertson | 6-3 3-6 6-7 |
2024 Roland Garros Junior
| W | 1R | William Rejchtman Vinciguerra | 6-4 7-6 |
| W | 2R | Luis Guto Miguel | 6-0 6-0 |
| W | 3R | Theo Papamalamis | 6-4 6-4 |
| L | QF | Lorenzo Carboni | 6-4 1-6 4-6 |
2024 Australian Open Junior
| W | 1R | Alexander Vasilev | 7-6 6-3 |
| W | 2R | Lorenzo Angelini | 6-4 6-2 |
| W | 3R | Pavle Marinkov | 4-6 6-0 6-1 |
| W | QF | Cooper Woestendick | 7-5 6-3 |
| W | SF | Nicolai Budkov Kjaer | 6-2 6-4 |
| W | F | Jan Kumstat | 3-6 7-6 7-5 |
2024 J300Traralgon
| W | 1R | Kriish Tyagi | 6-3 3-6 6-1 |
| W | 2R | Atakan Karahan | 6-2 6-3 |
| W | 3R | Tom Sickenberger | 6-1 6-4 |
| W | QF | Alexander Razeghi | 7-6 6-4 |
| W | SF | Mees Rottgering | 7-6 7-6 |
| W | F | Nicolai Budkov Kjaer | 6-4 6-1 |
2023 J500Plantation
| W | 1R | Keaton Hance | 6-3 6-1 |
| L | 2R | Luca Preda | 4-6 3-6 |
2023 J500Osaka
| W | 1R | Juan Kim | 6-4 6-4 |
| W | 2R | Marek Nano | 6-0 5-7 7-5 |
| W | 3R | Adhithya Ganesan | 6-3 6-2 |
| W | QF | Ruslan Tiukaev | 6-3 7-6 |
| L | SF | Joel Schwaerzler | 7-5 6-7 3-6 |
2023 Us Open Junior
| W | 1R | Iliyan Radulov | 7-6 6-4 |
| W | 2R | Roy Horovitz | 6-7 7-6 6-4 |
| L | 3R | Yi Zhou | 2-6 4-6 |
2023 J300Collegepark
| W | 2R | Aryan Shah | 6-1 6-0 |
| W | 3R | Stiles Brockett | 6-4 6-2 |
| L | QF | Alexander Razeghi | 1-6 1-6 |
2023 Wimbledon Junior
| W | 1R | Carlo Alberto Caniato | 7-6 6-4 |
| W | 2R | Thijs Boogaard | 7-6 7-6 |
| L | 3R | Joao Fonseca | 3-6 4-6 |
2023 J300Roehampton
| W | 1R | Petr Brunclik | 6-4 7-6 |
| L | 2R | Hayden Jones | 7-6 6-7 3-6 |
2023 Roland Garros Junior
| W | 1R | Charlie Camus | 6-7 6-1 6-1 |
| L | 2R | Jan Hrazdil | 6-7 4-6 |
2023 J500Milan
| L | 1R | Gabriele Vulpitta | 3-6 6-4 4-6 |
2023 J300Santacrocesullarno
| W | 1R | Guglielmo Verdese | 6-1 6-2 |
| L | 2R | Henry Searle | 6-2 4-6 6-7 |
2023 J500Offenbach
| W | 1R | Marc Majdandzic | 6-2 6-3 |
| L | 2R | Patrick Schoen | 6-0 2-6 4-6 |
2023 J300Beaulieu-Sur-Mer
| W | 1R | Roger Pascual Ferra | 6-1 6-2 |
| W | 2R | Gabriele Vulpitta | 6-1 4-6 6-1 |
| W | QF | Thijs Boogaard | 6-4 7-6 |
| L | SF | Oliver Ojakaar | 4-6 7-6 2-6 |
2023 J500Criciuma
| W | 1R | Ettore Romeo Baggio Danesi | 6-1 6-0 |
| W | 2R | Matthias Uwe Kask | 3-6 6-4 6-4 |
| W | 3R | Carlo Alberto Caniato | 7-6 6-7 6-2 |
| W | QF | Danil Panarin | 6-7 7-6 7-6 |
| L | SF | Joao Fonseca | 4-6 2-6 |
2023 J300Portoalegre
| L | 1R | Emilien Demanet | 5-7 2-6 |
2023 Australian Open Junior
| W | 1R | David Fix | 6-3 6-3 |
| W | 2R | Tiago Pires | 4-6 7-6 6-4 |
| L | 3R | Joao Fonseca | 3-6 4-6 |
2023 J300Traralgon
| W | 1R | Meecah Bigun | 6-4 6-3 |
| W | 2R | Volodymyr Iakubenko | 6-1 3-6 6-3 |
| W | 3R | Charlie Camus | 7-6 7-6 |
| L | QF | Kyle Kang | 3-6 4-6 |
2022 Japlantation
| W | 1R | Hoyoung Roh | 7-5 6-1 |
| W | 2R | Kaylan Bigun | 7-6 7-5 |
| W | 3R | Arthur Gea | 7-5 6-1 |
| L | QF | Rodrigo Pacheco Mendez | 3-6 6-7 |
2022 J1Bradenton
| L | 1R | Atakan Karahan | 5-7 5-7 |
2022 Jaosaka
| W | 1R | Moobeen Kim | 6-0 6-1 |
| W | 2R | Daniil Sarksian | 6-3 7-6 |
| L | 3R | Quang Duong | 1-6 6-7 |
2022 Us Open Junior
| W | 1R | Calvin Baierl | 6-1 7-6 |
| L | 2R | Gerard Campana Lee | 4-6 6-7 |
2022 Usopenjuniorchampionships
| W | 1R | Calvin Baierl | 6-1 7-6 |
| L | 2R | Gerard Campana Lee | 4-6 6-7 |
2022 J1Repentigny
| W | 2R | Joseph Phillips | 6-3 6-2 |
| L | 3R | Luis Carlos Alvarez Valdes | 7-5 3-6 6-7 |
2022 J1Collegepark
| W | 1R | Kase Schinnerer | 6-0 6-4 |
| W | 2R | Liam Drover-Mattinen | 6-7 6-3 6-2 |
| L | 3R | Alexander Razeghi | 2-6 3-6 |
2022 Japretoria
| W | 1R | Henry Jefferson | 6-2 6-1 |
| W | 2R | Valentin Basel | 6-2 4-6 6-2 |
| L | QF | Danil Panarin | 0-1 |
2022 J1Durban
| W | 1R | Wian Roothman | 4-6 6-4 6-3 |
| W | 2R | Islam Orynbasar | 6-7 6-1 6-4 |
| W | QF | Goran Zgola | 6-3 3-6 6-1 |
| W | SF | Yannik Rahman | 6-4 6-2 |
| L | F | Leanid Boika | 2-6 6-7 |
2022 J1Roehampton
| L | 1R | Dylan Dietrich | 6-2 1-6 5-7 |
2022 J1Nottingham
| L | 2R | Kaylan Bigun | 3-6 2-6 |
2022 J2Gladbeck
| W | 1R | Justin Engel | 6-3 6-1 |
| L | 2R | Alexander Razeghi | 6-2 4-6 4-6 |
2022 J1Bamberg
| W | 2R | Maxim Mrva | 4-6 6-0 6-2 |
| W | 3R | Max Batyutenko | 6-4 6-1 |
| W | QF | Liam Gavrielides | 6-4 6-3 |
| L | SF | Rodrigo Pacheco Mendez | 3-6 4-6 |
2022 J1Charleroi-Marcinelle
| W | 1R | Jangjun Kim | 6-3 6-4 |
| W | 2R | Alessio Basile | 7-6 6-7 6-1 |
| W | 3R | Joao Fonseca | 6-3 5-7 6-2 |
| W | QF | Ignacio Buse | 0-6 6-3 6-1 |
| L | SF | Arthur Gea | 3-6 5-7 |
2022 Jamilan
| L | 1R | Liam Gavrielides | 3-6 2-6 |
2022 J1Santacrocesullarno
| L | 1R | Erik Arutiunian | 2-6 5-7 |
2022 J2Istres
| W | 1R | Arthur Gea | 6-3 6-4 |
| W | 2R | Stylianos Christodoulou | 7-6 6-1 |
| W | QF | Alexander Orlov | 6-4 6-3 |
| W | SF | Alejandro Melero Kretzer | 7-5 7-5 |
| W | F | Kenta Miyoshi | 6-3 6-4 |
2022 J2Capdail
| W | 1R | Romain Gales | 6-4 6-4 |
| W | 2R | Arthur Gea | 6-3 6-4 |
| W | QF | Georg Eduard Israelan | 6-3 6-3 |
| W | SF | Jan Kobierski | 6-3 7-5 |
| L | F | Martin Landaluce | 2-6 2-6 |
2022 J1Sandiego
| W | 1R | Landon Ardila | 6-4 6-4 |
| L | 2R | Bryce Nakashima Nakashima | 0-6 4-6 |
2022 J3Cancun
| W | 1R | Tommy Czaplinski | 6-4 6-4 |
| W | 2R | Toprak Avcibasi | 6-1 6-3 |
| W | 3R | Jacob Olar | 6-2 6-4 |
| W | QF | Jackson Armistead | 6-4 6-4 |
| W | SF | Stefan Regalia | 7-6 6-3 |
| W | F | Francisco Sinopoli | 6-4 7-5 |
2022 J3Tampico
| W | 1R | Pablo Segura | 6-2 6-1 |
| W | 2R | Jackson Armistead | 6-3 7-6 |
| W | 3R | Santiago Padilla Cote | 6-2 6-2 |
| W | QF | Ari Cotoulas | 6-0 6-2 |
| W | SF | Evan Wen | 4-6 6-3 6-3 |
| W | F | Felipe Pinzon Moreno | 6-4 6-3 |
2022 J5Monterrey
| W | 1R | Luis Eduardo Arellano Rojas | 6-2 6-1 |
| W | 2R | Juan Luis Reding | 6-3 1-6 6-1 |
| W | 3R | Ari Cotoulas | 6-3 6-0 |
| W | QF | Aaron Yu | 6-2 6-3 |
| W | SF | Kane Bonsach Ganley | 6-4 6-4 |
| W | F | Jordan Reznik | 6-3 6-4 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 9232, Number of registered players: 5,739, Number of registered results: 303,630