Hiromasa Koyama
2025
| J300 NONTHABURICLOSEDREGIONALCHAMPIONHSIPS | [12] | 2R |
| J300 KUCHING | [12] | Quarter |
| J200 KUALALUMPUR | [9] | 3R |
| J300 NONTHABURI | [16] | 2R |
| J200 NONTHABURI | [14] | 3R |
| AUSTRALIAN OPEN JUNIOR | 1R | |
| J300 TRARALGON | 1R |
2024
| J200 HONGKONG | [5] | Semi |
| J100 HONGKONG | [2] | 2R |
| J300 WANJU | Semi | |
| J100 KAWAGUCHI | [2] | 2R |
| J500 OSAKA | 1R | |
| J100 DAKAHLIA | Semi | |
| J100 CAIRO | [7] | Final |
| J100 LOUSADA-2 | [8] | 2R |
| J100 LOUSADA | [13] | Quarter |
| J300 NONTHABURI-2 | Quarter | |
| J100 LAMARSA | 2R | |
| J100 SOUSSE | [8] | 1R |
| J100 ISTANBUL-3 | 2R | |
| J100 ISTANBUL-2 | 2R | |
| J200 NONTHABURI | 1R |
2023
| J100 PUNE | [16] | Semi |
| J60 NEWDELHI | Final | |
| J200 NAGOYA | 2R | |
| J500 OSAKA | 1R | |
| J300 WANJU | 2R | |
| J200 TAINAN | 1R | |
| J100 ANDONG | 2R | |
| J100 KUALALUMPUR | 3R | |
| J100 SARAWAK | 2R | |
| J30 BASTAD | [7] | Win |
| J100 VARNAMO | 2R | |
| J60 ANDONG | Final | |
| J30 KURUME | Semi |
2022
Nation
JPN
Generation
Born in 2007 (17-18 years old)
World Ranking
Junior World Ranking　145th
ATP Ranking　1575th
Year-end Junior World Ranking
- Year-end 2024 134th
- Year-end 2023 445th
- Year-end 2022 1689th
- Year-end 2021 2038th
Match Details
2025 J300 NONTHABURICLOSEDREGIONALCHAMPIONHSIPS
| L | 2R | Min Ho Ko | 6-4 5-7 0-1 |
2025 J300 KUCHING
| W | 2R | Penn Charusorn | 6-2 6-1 |
| W | 3R | Jake Dembo | 6-2 6-1 |
| L | QF | Min Ho Ko | 6-2 4-6 5-7 |
2025 J200 KUALALUMPUR
| W | 2R | Sriniketh Kannan | 6-3 6-4 |
| L | 3R | Cruz Hewitt | 6-3 4-6 6-7 |
2025 J300 NONTHABURI
| L | 2R | Artem Bogomolov | 6-2 4-6 0-6 |
2025 J200 NONTHABURI
| W | 2R | Kunanan Pantaratorn | 6-4 2-6 6-3 |
| L | 3R | Egor Pleshivtsev | 3-6 2-6 |
2025 AUSTRALIAN OPEN JUNIOR
| L | 1R | Andres Santamarta Roig | 7-6 3-6 0-6 |
2025 J300 TRARALGON
| L | 1R | Andrea De Marchi | 4-6 4-6 |
2024 J200 HONGKONG
| W | 1R | Kai Thompson | 6-2 6-3 |
| W | 2R | Dzmitry Dziubailau | 7-5 6-2 |
| W | QF | Donghyun Hwang | 7-6 6-3 |
| L | SF | Hitesh Chauhan | 6-4 2-6 5-7 |
2024 J100 HONGKONG
| W | 1R | Siu Chi Nicholas Cheng | 6-1 6-3 |
| L | 2R | Lucas Mock | 2-6 6-7 |
2024 J300 WANJU
| W | 1R | Min Ho Ko | 6-2 6-3 |
| W | 2R | Jinpeng Tang | 6-3 7-6 |
| W | 3R | Amir Omarkhanov | 3-6 6-4 6-3 |
| W | QF | Moobeen Kim | 6-3 5-7 6-1 |
| L | SF | Rethin Pranav Senthil Kumar | 4-6 3-6 |
2024 J100 KAWAGUCHI
| W | 1R | Shun Yoshino | 6-2 6-0 |
| L | 2R | Wenbo Bai | 3-6 6-2 2-6 |
2024 J500 OSAKA
| L | 1R | Nikita Bilozertsev | 3-6 1-6 |
2024 J100 DAKAHLIA
| W | 1R | Karim Mabrouk | 4-6 6-2 7-6 |
| W | 2R | Michele Mecarelli | 6-4 2-6 6-2 |
| W | QF | Jinpeng Tang | 6-2 6-2 |
| L | SF | Haydar Cem Gokpinar | 3-6 1-6 |
2024 J100 CAIRO
| W | 1R | Pratyaksh Xxx | 6-1 6-3 |
| W | 2R | Yassin Ahmed Wageh | 6-2 6-1 |
| W | QF | Ye Chen | 4-6 6-2 7-6 |
| W | SF | Hitesh Chauhan | 6-0 6-3 |
| L | F | Michele Mecarelli | 4-6 1-6 |
2024 J100 LOUSADA-2
| L | 2R | Salvador Monteiro | 4-6 3-6 |
2024 J100 LOUSADA
| W | 2R | Rodrigo Duarte | 7-5 6-4 |
| W | 3R | Stephan Noale | 6-1 6-3 |
| L | QF | Luka Talan Lopatic | 6-3 4-6 4-10 |
2024 J300 NONTHABURI-2
| W | 1R | Minh Phat Nguyen | 6-2 6-2 |
| W | 2R | Harry Pugh | 6-4 6-1 |
| W | 3R | Kriish Tyagi | 2-6 7-5 6-4 |
| L | QF | Ryo Tabata | 5-7 4-6 |
2024 J100 LAMARSA
| W | 1R | Matteo Gribaldo | 5-7 6-4 6-3 |
| L | 2R | Luc Wieland | 5-7 7-5 6-7 |
2024 J100 SOUSSE
| L | 1R | Ziga Sesko | 3-6 6-4 3-6 |
2024 J100 ISTANBUL-3
| W | 1R | Kerem Tufekci | 6-3 6-0 |
| L | 2R | Mehmet Onur Turgut | 6-3 6-7 3-6 |
2024 J100 ISTANBUL-2
| W | 1R | Yunus Emre Insel | 7-6 6-1 |
| L | 2R | Marat Salbiev | 3-6 6-3 5-7 |
2024 J200 NONTHABURI
| L | 1R | Manvydas Balciunas | 1-6 1-6 |
2023 J100 PUNE
| W | 2R | Svarmanyu Singh | 3-6 7-5 6-1 |
| W | 3R | Ivan Iutkin | 6-4 1-6 6-1 |
| W | QF | Kandhavel Mahalingam Akilandeshwari | 6-1 7-5 |
| L | SF | Moise Kouame | - - - |
2023 J60 NEWDELHI
| W | 1R | Tejas Ahuja | 6-0 6-2 |
| W | 2R | Egor Shcherbakov | 2-6 7-5 6-3 |
| W | QF | Aleksandar Daskalovic | 6-0 6-2 |
| W | SF | Kriish Tyagi | 6-4 7-6 |
| L | F | Rethin Pranav Senthil Kumar | 3-6 3-6 |
2023 J200 NAGOYA
| W | 1R | Jheng-Min Huang | 6-4 7-5 |
| L | 2R | Yuta Tomida | 2-6 6-2 3-6 |
2023 J500 OSAKA
| L | 1R | Charlie Camus | 3-6 6-7 |
2023 J300 WANJU
| W | 1R | Woojun Kang | 6-1 6-4 |
| L | 2R | Thanaphat Boosarawongse | 6-4 3-6 0-6 |
2023 J200 TAINAN
| L | 1R | Chun-Chien Hou | 0-6 6-7 |
2023 J100 ANDONG
| W | 1R | Hyung Tak Oh | 6-4 7-5 |
| L | 2R | Goncalo Marques | 2-6 4-6 |
2023 J100 KUALALUMPUR
| W | 1R | Darrshan Suresh Kumar | 6-4 6-4 |
| W | 2R | Juan Kim | 6-3 6-3 |
| L | 3R | Pham La Hoang Anh | 5-7 6-1 3-6 |
2023 J100 SARAWAK
| W | 1R | Diordan Macababbad | 6-2 6-3 |
| L | 2R | Pham La Hoang Anh | 2-6 6-3 4-6 |
2023 J30 BASTAD
| W | 2R | Maximilian Schlawitz | 6-1 6-3 |
| W | 3R | Melvin Kumar | 6-2 6-3 |
| W | QF | Sturle Hoff Skigelstrand | 6-3 6-2 |
| W | SF | Tom Noltorp | 6-2 6-2 |
| W | F | Patrik Munkhammar | 6-2 6-4 |
2023 J100 VARNAMO
| W | 1R | Oskar Loef | 6-1 6-1 |
| L | 2R | Linus Lagerbohm | 6-4 0-6 2-6 |
2023 J60 ANDONG
| W | 1R | Min Seok Maeng | 7-5 3-6 6-2 |
| W | 2R | Jiwan Park | 6-3 6-3 |
| W | QF | Taewan Joo | 6-2 6-1 |
| W | SF | Hyowon Hwang | 3-6 6-3 6-4 |
| L | F | Min Ho Ko | 4-6 3-6 |
2023 J30 KURUME
| W | 1R | Min Kyeol Lee | 6-0 5-7 7-5 |
| W | 2R | Christopher Kosei Ono | 6-4 2-6 6-1 |
| W | QF | Roshu Fujioka | 6-4 6-1 |
| L | SF | Yamato Yukawa | 1-6 3-6 |
2022 J5 GIFU
| W | 1R | Natsuki Yamamoto | 6-2 6-4 |
| W | 2R | Christopher Kosei Ono | 6-3 6-4 |
| L | QF | Hiiro Sakamoto | 3-6 2-6 |
2022 J2 NAGOYA
| L | 1R | Hikaru Takahashi | 4-6 6-4 5-7 |
2022 JAOSAKA
| L | 1R | Yu Maeda | 5-7 4-6 |
2022 J5 SKOPJE
| W | 1R | Teun Mantel | 6-3 6-0 |
| W | 2R | Jacopo Vasami | 6-1 3-6 6-4 |
| L | QF | Ognjen Milic | 0-6 1-6 |
2022 J4 SKOPJE
| W | 1R | Thijs Boogaard | 6-3 6-3 |
| L | 2R | Romeo Hadzimehmedovic | 1-6 1-6 |
2022 J5 NIS
| W | 1R | Vuk Vukicevic | 6-0 6-0 |
| L | 2R | Andres Santamarta Roig | 1-6 2-6 |
2022 J5 SUBOTICA
| L | 1R | Merse Deli | 3-6 1-6 |
2022 J5 KURUME
| W | 1R | Ko Nagashima | 6-1 6-4 |
| L | 2R | Shu Muto | 2-6 3-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 9586, Number of registered players: 5,950, Number of registered results: 317,378