Rei Sakamoto
2024
| US OPEN JUNIOR | [3] | Semi |
| J300 COLLEGEPARK | [1] | 3R |
| ROLAND GARROS JUNIOR | [1] | Quarter |
| AUSTRALIAN OPEN JUNIOR | [4] | Win |
| J300 TRARALGON | [4] | Win |
2023
| J500 PLANTATION | [4] | 2R |
| J500 OSAKA | [3] | Semi |
| US OPEN JUNIOR | 3R | |
| J300 COLLEGEPARK | [6] | Quarter |
| WIMBLEDON JUNIOR | [11] | 3R |
| J300 ROEHAMPTON | [11] | 2R |
| ROLAND GARROS JUNIOR | [12] | 2R |
| J500 MILAN | [10] | 1R |
| J300 SANTACROCESULLARNO | [3] | 2R |
| J500 OFFENBACH | [6] | 2R |
| J300 BEAULIEU-SUR-MER | [2] | Semi |
| J500 CRICIUMA | [1] | Semi |
| J300 PORTOALEGRE | [2] | 1R |
| AUSTRALIAN OPEN JUNIOR | [6] | 3R |
| J300 TRARALGON | [6] | Quarter |
2022
| JAPLANTATION | [8] | Quarter |
| J1 BRADENTON | [3] | 1R |
| JAOSAKA | [2] | 3R |
| US OPEN JUNIOR | 2R | |
| J1 REPENTIGNY | [3] | 3R |
| J1 COLLEGEPARK | [2] | 3R |
| JAPRETORIA | [1] | Quarter |
| J1 DURBAN | [1] | Final |
| J1 ROEHAMPTON | 1R | |
| J1 NOTTINGHAM | [9] | 2R |
| J2 GLADBECK | [1] | 2R |
| J1 BAMBERG | [5] | Semi |
| J1 CHARLEROI-MARCINELLE | Semi | |
| JAMILAN | 1R | |
| J1 SANTACROCESULLARNO | 1R | |
| J2 ISTRES | Win | |
| J2 CAPDAIL | Final | |
| J1 SANDIEGO | [14] | 2R |
| J3 CANCUN | Win | |
| J3 TAMPICO | Win | |
| J5 MONTERREY | [4] | Win |
2021
| J4 NAGOYA | Quarter | |
| J4 OSAKA | [8] | Semi |
| J4 MIKI-CITY | Semi |
Nation
JPN
Age
19 years old (born in 2006)
World Ranking
ATP Ranking　159th
Year-end Junior World Ranking
- Year-end 2024 5th
- Year-end 2023 18th
- Year-end 2022 33th
- Year-end 2021 779th
Match Details
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 |
J300 COLLEGEPARK
| W | 2R | Calvin Baierl | 6-2 |
| L | 3R | Charlie Robertson | 6-3 3-6 6-7 |
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 |
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 |
J300 TRARALGON
| 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 |
J500 PLANTATION
| W | 1R | Keaton Hance | 6-3 6-1 |
| L | 2R | Luca Preda | 4-6 3-6 |
J500 OSAKA
| 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 |
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 |
J300 COLLEGEPARK
| W | 2R | Aryan Shah | 6-1 6-0 |
| W | 3R | Stiles Brockett | 6-4 6-2 |
| L | QF | Alexander Razeghi | 1-6 1-6 |
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 |
J300 ROEHAMPTON
| W | 1R | Petr Brunclik | 6-4 7-6 |
| L | 2R | Hayden Jones | 7-6 6-7 3-6 |
ROLAND GARROS JUNIOR
| W | 1R | Charlie Camus | 6-7 6-1 6-1 |
| L | 2R | Jan Hrazdil | 6-7 4-6 |
J500 MILAN
| L | 1R | Gabriele Vulpitta | 3-6 6-4 4-6 |
J300 SANTACROCESULLARNO
| W | 1R | Guglielmo Verdese | 6-1 6-2 |
| L | 2R | Henry Searle | 6-2 4-6 6-7 |
J500 OFFENBACH
| W | 1R | Marc Majdandzic | 6-2 6-3 |
| L | 2R | Patrick Schoen | 6-0 2-6 4-6 |
J300 BEAULIEU-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 |
J500 CRICIUMA
| 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 |
J300 PORTOALEGRE
| L | 1R | Emilien Demanet | 5-7 2-6 |
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 |
J300 TRARALGON
| 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 |
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 |
J1 BRADENTON
| L | 1R | Atakan Karahan | 5-7 5-7 |
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 |
US OPEN JUNIOR
| W | 1R | Calvin Baierl | 6-1 7-6 |
| L | 2R | Gerard Campana Lee | 4-6 6-7 |
J1 REPENTIGNY
| W | 2R | Joseph Phillips | 6-3 6-2 |
| L | 3R | Luis Carlos Alvarez Valdes | 7-5 3-6 6-7 |
J1 COLLEGEPARK
| 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 |
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 |
J1 DURBAN
| 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 |
J1 ROEHAMPTON
| L | 1R | Dylan Dietrich | 6-2 1-6 5-7 |
J1 NOTTINGHAM
| L | 2R | Kaylan Bigun | 3-6 2-6 |
J2 GLADBECK
| W | 1R | Justin Engel | 6-3 6-1 |
| L | 2R | Alexander Razeghi | 6-2 4-6 4-6 |
J1 BAMBERG
| 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 |
J1 CHARLEROI-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 |
JAMILAN
| L | 1R | Liam Gavrielides | 3-6 2-6 |
J1 SANTACROCESULLARNO
| L | 1R | Erik Arutiunian | 2-6 5-7 |
J2 ISTRES
| 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 |
J2 CAPDAIL
| 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 |
J1 SANDIEGO
| W | 1R | Landon Ardila | 6-4 6-4 |
| L | 2R | Bryce Nakashima Nakashima | 0-6 4-6 |
J3 CANCUN
| 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 |
J3 TAMPICO
| 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 |
J5 MONTERREY
| 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 |
J4 NAGOYA
| W | 1R | Shion Itsusaki | 6-3 6-4 |
| W | 2R | Tsubasa Nakamura | 6-4 6-4 |
| L | QF | Kosuke Morita | 5-7 4-6 |
J4 OSAKA
| W | 1R | Tsubasa Nakamura | 6-1 6-3 |
| W | 2R | Yuito Sasaki | 6-3 6-2 |
| W | QF | Takamasa Mishiro | 6-3 6-2 |
| L | SF | Yuta Tomida | 5-7 2-6 |
J4 MIKI-CITY
| W | 1R | Hiiro Sakamoto | 7-5 6-1 |
| W | 2R | Kosuke Morita | 6-3 6-3 |
| W | QF | Takamasa Mishiro | 6-1 7-6 |
| L | SF | Asahi Harazaki | 1-6 2-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 10505, Number of registered players: 6,666, Number of registered results: 385,227