Koyu Yanagi
2025
| J100Nairobi | [6] | Quarter |
| J60Nairobi | [3] | 3R |
2024
| J30Gifu | [3] | 1R |
| J30Matsuyama | [2] | 1R |
| J60Hokuto-City | [5] | Quarter |
| J100Kawaguchi | 1R | |
| J60Eindhoven | [15] | Semi |
| J60Hillegom | 2R | |
| J60Nonthaburi-2 | [13] | 3R |
| J60Nonthaburi | [11] | Quarter |
| J60Mikicity-2 | [8] | 2R |
| J60Mikicity | 1R | |
| J60Yanggu-Gun | [6] | 1R |
| J60Gimcheon | [7] | 2R |
| J100Brisbane-2 | 1R | |
| J100Brisbane | 2R | |
| J60Hongkong | Semi |
2023
| J30Gifu | [6] | Quarter |
| J30Chigasaki | [6] | Quarter |
| J60Yamanashi | [8] | Quarter |
| J30Osaka | [7] | Quarter |
| J100Kawaguchi | Quarter | |
| J60Mikicity | 2R | |
| J30Yamanashi | [6] | Final |
| J100Mornington | 2R | |
| J100Canberra | 1R |
2022
| Ai Sugiyama Cup | Quarter |
Nation
JPN
Generation
Born in 2009 (15-16 years old)
World Ranking
Junior World Ranking　568th
Year-end Junior World Ranking
- Year-end 2024 693th
- Year-end 2023 1008th
- Year-end 2022 1792th
Match Details
2025 J100Nairobi
| W | 2R | Gonzalo Corrales Chavarria | 5-0 |
| W | 3R | Guy Leviner | 3-6 6-0 6-1 |
| L | QF | Amar Huseinovic | 6-4 3-6 3-6 |
2025 J60Nairobi
| W | 2R | Riccardo Carpano | 6-3 6-0 |
| L | 3R | Abdelaziz Guennouni | 5-7 2-6 |
2024 J30Gifu
| L | 1R | Yuma Tobe | 6-0 4-6 2-6 |
2024 J30Matsuyama
| L | 1R | Hikaru Hieda | 6-4 1-6 2-6 |
2024 J60Hokuto-City
| W | 1R | Sota Nakatomi | 6-0 6-3 |
| W | 2R | Yuta Amano | 6-2 6-4 |
| L | QF | Yuki Okahashi | 5-7 2-6 |
2024 J100Kawaguchi
| L | 1R | Riku Nakamoto | 6-3 3-6 4-6 |
2024 J60Eindhoven
| W | 2R | Kaj Glaser | 3-6 6-2 6-1 |
| W | 3R | Luca Connaughton | 3-6 6-1 6-4 |
| W | QF | Motoharu Abe | 7-5 7-5 |
| L | SF | Hyu Kawanishi | 6-3 4-6 4-6 |
2024 J60Hillegom
| W | 1R | Nathan Mansfield | 4-6 6-4 6-0 |
| L | 2R | Hidde Schoenmakers | 0-6 0-6 |
2024 J60Nonthaburi-2
| W | 2R | Tri Srisen | 6-1 6-0 |
| L | 3R | Hitesh Chauhan | 1-6 6-4 4-6 |
2024 J60Nonthaburi
| W | 2R | Ryu Kotikula | 6-1 6-2 |
| W | 3R | Praneel Sharma | 6-2 6-2 |
| L | QF | Koshiro Nakamae | 1-6 4-6 |
2024 J60Mikicity-2
| W | 1R | Ryo Kikawa | 6-1 6-0 |
| L | 2R | Kanta Watanabe | 4-6 6-4 2-6 |
2024 J60Mikicity
| L | 1R | Hakuto Imanishi | 4-6 3-6 |
2024 J60Yanggu-Gun
| L | 1R | Min Hyuk Cho | 3-6 3-6 |
2024 J60Gimcheon
| W | 1R | Tae Woo Kim | 6-1 7-5 |
| L | 2R | Jinyeong Kim | 3-6 2-6 |
2024 J100Brisbane-2
| L | 1R | Lachlan Mcfadzean | 1-6 1-6 |
2024 J100Brisbane
| W | 1R | Ymerali Ibraimi | 6-4 6-4 |
| L | 2R | Lev Gorb | 5-7 4-6 |
2024 J60Hongkong
| W | 1R | Siu Chi Cheng | 6-2 6-3 |
| W | 2R | Kangyuan Shi | 6-1 1-6 7-5 |
| W | QF | Xiao-Feng Zhou | 6-1 6-3 |
| L | SF | Koshiro Nakamae | 3-6 3-6 |
2023 J30Gifu
| W | 1R | Eita Suzuki | 6-1 3-6 6-4 |
| W | 2R | Ryo Kikawa | 6-1 6-3 |
| L | QF | Hyowon Hwang | 7-5 4-6 2-6 |
2023 J30Chigasaki
| W | 1R | Haruto Koyanagi | 0-6 6-0 6-2 |
| W | 2R | Ryuto Suzuki | 6-2 6-2 |
| L | QF | Taisei Hata | 7-5 3-6 3-6 |
2023 J60Yamanashi
| W | 1R | Haruki Mizuno | 6-2 6-1 |
| W | 2R | Eita Suzuki | 6-0 6-1 |
| L | QF | Hyu Kawanishi | 6-4 3-6 5-10 |
2023 J30Osaka
| W | 1R | Maki Takei | 6-4 6-2 |
| W | 2R | Agashi Kubota | 6-1 6-3 |
| L | QF | Soma Fukuhara | 1-6 3-6 |
2023 J100Kawaguchi
| W | 1R | Nagamitsu Kuroda | 6-4 6-3 |
| W | 2R | Kriish Tyagi | 7-5 6-2 |
| L | QF | Eito Komada | 0-6 3-6 |
2023 J60Mikicity
| W | 1R | Kou Fujikawa | 6-4 6-2 |
| L | 2R | Gaku Nayuki | 3-6 0-3 |
2023 J30Yamanashi
| W | 1R | Kitto Mochizuki | 6-0 6-1 |
| W | 2R | Napat Narongdej | 4-6 6-0 6-2 |
| W | QF | Kou Fujikawa | 6-4 6-1 |
| W | SF | Eita Suzuki | 6-1 6-0 |
| L | F | Yui Kitabayashi | - - - |
2023 J100Mornington
| W | 1R | Mudiwa Munyimani | 3-6 6-4 6-0 |
| L | 2R | Brendan Loh | 1-6 2-6 |
2023 J100Canberra
| L | 1R | Jay Fairclough | 2-6 3-6 |
2022 Ai Sugiyama Cup
| W | 1R | Woojun Kang | 7-6 7-5 |
| W | 2R | Kouki Oka | 7-6 6-3 |
| L | QF | Yuya Ando | 4-6 7-5 0-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 5774, Number of registered players: 3,011, Number of registered results: 222,093