Hiromasa Koyama
2025
| J300Nonthaburiclosedregionalchampionhsips | [12] | 2R |
| J300Kuching | [12] | Quarter |
| J200Kualalumpur | [9] | 3R |
| J300Nonthaburi | [16] | 2R |
| J200Nonthaburi | [14] | 3R |
| Australian Open Junior | 1R | |
| J300Traralgon | 1R |
2024
| J200Hongkong | [5] | Semi |
| J100Hongkong | [2] | 2R |
| J300Wanju | Semi | |
| J100Kawaguchi | [2] | 2R |
| J500Osaka | 1R | |
| J100Dakahlia | Semi | |
| J100Cairo | [7] | Final |
| J100Lousada-2 | [8] | 2R |
| J100Lousada | [13] | Quarter |
| J300Nonthaburi-2 | Quarter | |
| J100Lamarsa | 2R | |
| J100Sousse | [8] | 1R |
| J100Istanbul-3 | 2R | |
| J100Istanbul-2 | 2R | |
| J200Nonthaburi | 1R |
2023
| J100Pune | [16] | Semi |
| J60Newdelhi | Final | |
| J200Nagoya | 2R | |
| J500Osaka | 1R | |
| J300Wanju | 2R | |
| J200Tainan | 1R | |
| J100Andong | 2R | |
| J100Kualalumpur | 3R | |
| J100Sarawak | 2R | |
| J30Bastad | [7] | Win |
| J100Varnamo | 2R | |
| J60Andong | Final | |
| J30Kurume | Semi |
Nation
JPN
Generation
Born in 2007 (17-18 years old)
World Ranking
Junior World Ranking　113th
ATP Ranking　2100th
Year-end Junior World Ranking
- Year-end 2024 134th
- Year-end 2023 445th
- Year-end 2022 1689th
- Year-end 2021 2038th
Rival
Hitesh Chauhan (1-1)
Michele Mecarelli (1-1)
Rethin Pranav Senthil Kumar (0-2)
Jinpeng Tang (2-0)
Kriish Tyagi (2-0)
Match Details
2025 J300Nonthaburiclosedregionalchampionhsips
| L | 2R | Min Ho Ko | 6-4 5-7 0-1 |
2025 J300Kuching
| 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 J200Kualalumpur
| W | 2R | Sriniketh Kannan | 6-3 6-4 |
| L | 3R | Cruz Hewitt | 6-3 4-6 6-7 |
2025 J300Nonthaburi
| L | 2R | Artem Bogomolov | 6-2 4-6 0-6 |
2025 J200Nonthaburi
| 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 J300Traralgon
| L | 1R | Andrea De Marchi | 4-6 4-6 |
2024 J200Hongkong
| 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 J100Hongkong
| W | 1R | Siu Chi Nicholas Cheng | 6-1 6-3 |
| L | 2R | Lucas Mock | 2-6 6-7 |
2024 J300Wanju
| 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 J100Kawaguchi
| W | 1R | Shun Yoshino | 6-2 6-0 |
| L | 2R | Wenbo Bai | 3-6 6-2 2-6 |
2024 J500Osaka
| L | 1R | Nikita Bilozertsev | 3-6 1-6 |
2024 J100Dakahlia
| 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 J100Cairo
| 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 J100Lousada-2
| L | 2R | Salvador Monteiro | 4-6 3-6 |
2024 J100Lousada
| 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 J300Nonthaburi-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 J100Lamarsa
| W | 1R | Matteo Gribaldo | 5-7 6-4 6-3 |
| L | 2R | Luc Wieland | 5-7 7-5 6-7 |
2024 J100Sousse
| L | 1R | Ziga Sesko | 3-6 6-4 3-6 |
2024 J100Istanbul-3
| W | 1R | Kerem Tufekci | 6-3 6-0 |
| L | 2R | Mehmet Onur Turgut | 6-3 6-7 3-6 |
2024 J100Istanbul-2
| W | 1R | Yunus Emre Insel | 7-6 6-1 |
| L | 2R | Marat Salbiev | 3-6 6-3 5-7 |
2024 J200Nonthaburi
| L | 1R | Manvydas Balciunas | 1-6 1-6 |
2023 J100Pune
| 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 J60Newdelhi
| 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 J200Nagoya
| W | 1R | Jheng-Min Huang | 6-4 7-5 |
| L | 2R | Yuta Tomida | 2-6 6-2 3-6 |
2023 J500Osaka
| L | 1R | Charlie Camus | 3-6 6-7 |
2023 J300Wanju
| W | 1R | Woojun Kang | 6-1 6-4 |
| L | 2R | Thanaphat Boosarawongse | 6-4 3-6 0-6 |
2023 J200Tainan
| L | 1R | Chun-Chien Hou | 0-6 6-7 |
2023 J100Andong
| W | 1R | Hyung Tak Oh | 6-4 7-5 |
| L | 2R | Goncalo Marques | 2-6 4-6 |
2023 J100Kualalumpur
| 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 J100Sarawak
| W | 1R | Diordan Macababbad | 6-2 6-3 |
| L | 2R | Pham La Hoang Anh | 2-6 6-3 4-6 |
2023 J30Bastad
| 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 J100Varnamo
| W | 1R | Oskar Loef | 6-1 6-1 |
| L | 2R | Linus Lagerbohm | 6-4 0-6 2-6 |
2023 J60Andong
| 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 J30Kurume
| 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 |
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