Roger Koike
2025
| J200Kualalumpur | Semi |
2024
| J30Kaohsiung-2 | [4] | Quarter |
| J30Kaohsiung | [3] | Semi |
| J300Wanju | 1R | |
| J100Kawaguchi | 2R | |
| J100Seoul | Quarter | |
| J100Andong | 2R | |
| J200Chuncheon | 2R | |
| J100Kuching | 1R | |
| J60Orlando | 2R | |
| J100Plantation | 2R | |
| J100Coralgables,Fl | 1R | |
| J100Delraybeach | 1R | |
| J60Bayamon | [9] | 3R |
| J30Bayamon | [10] | Quarter |
2023
Generation
Born in 2008 (16-17 years old)
World Ranking
Junior World Ranking　580th
Year-end Junior World Ranking
- Year-end 2024 697th
- Year-end 2023 1773th
Match Details
2025 J200Kualalumpur
| W | 1R | Mustafa Ege Sik | 6-3 6-4 |
| W | 2R | Arnav Paparkar | 2-6 7-6 6-2 |
| W | 3R | Kaigaoge Kang | 2-6 7-5 6-1 |
| W | QF | Nikolas Baker | 6-4 2-6 3-0 |
| L | SF | Cruz Hewitt | 4-6 4-6 |
2024 J30Kaohsiung-2
| W | 2R | Jayden Park | 6-0 6-1 |
| W | 3R | Brandon Duan | 6-4 6-1 |
| L | QF | Xiao-Feng Zhou | 6-4 2-6 3-6 |
2024 J30Kaohsiung
| W | 2R | Hong Xuan Chen | 6-1 6-2 |
| W | 3R | Yu-Hsiang Chuang | 4-2 4-0 |
| W | QF | Bo Yu Wu | 6-2 6-0 |
| L | SF | Kuan-Huai Mao | 5-7 4-6 |
2024 J300Wanju
| L | 1R | Hoyoung Roh | 2-6 3-6 |
2024 J100Kawaguchi
| W | 1R | Rei Sato | 7-5 7-6 |
| L | 2R | Ren Matsumura | 3-6 3-6 |
2024 J100Seoul
| W | 1R | Woo Yeon Na | 6-0 6-3 |
| W | 2R | Ju Hun Choo | 6-0 6-1 |
| L | QF | Fanming Meng | 2-6 4-6 |
2024 J100Andong
| W | 1R | Jisung Lee | 6-1 6-0 |
| L | 2R | Christian Gronfeldt-Sorensen | 4-6 4-6 |
2024 J200Chuncheon
| W | 1R | Lachlan Mcfadzean | 6-3 6-3 |
| L | 2R | Donghyun Hwang | 2-6 3-6 |
2024 J100Kuching
| L | 1R | Ethan David Zapp | 6-1 2-6 4-4 |
2024 J60Orlando
| W | 1R | Juan Carlos Portilla Morales | 6-2 6-3 |
| L | 2R | Andrew Johnson | 2-6 1-6 |
2024 J100Plantation
| W | 1R | Ian Miller | 2-6 6-0 6-3 |
| L | 2R | Nathan Blokhin | 3-6 4-6 |
2024 J100Coralgables,Fl
| L | 1R | Jerrid Gaines Jr | 1-6 6-7 |
2024 J100Delraybeach
| L | 1R | Cole Henceroth | 6-7 2-6 |
2024 J60Bayamon
| W | 2R | Pedro Antonio Valpereiro | 6-1 6-2 |
| L | 3R | Ziyan Zhang | 2-6 3-6 |
2024 J30Bayamon
| W | 2R | Jack Dermenjyan | 7-5 6-3 |
| W | 3R | Gianluca Galasso | 6-1 6-2 |
| L | QF | Matthew Zeifman | 2-6 7-6 3-6 |
2023 J30Kaohsiung-2
| W | 1R | Xin-An Fa | 6-2 6-3 |
| W | 2R | Hong Kiu Lau | 6-2 7-6 |
| W | 3R | Min Hsiang Tsao | 6-4 6-0 |
| W | QF | Ting-Ho Yang | 4-6 6-2 6-3 |
| L | SF | Lin Hao-Yu | 2-6 1-6 |
2023 J30Kaohsiung
| W | 1R | Yu-En Tsai | 6-3 6-2 |
| W | 2R | Ethan Matthew Koh | 6-0 6-7 7-5 |
| W | 3R | Yan Yu Lin | 2-6 6-2 6-4 |
| W | QF | Hung-Yu Chen | 6-3 6-0 |
| W | SF | Xiao-Feng Zhou | 6-2 6-2 |
| L | F | Syue-Lian Chuang | 3-6 6-7 |
2023 J100Santodomingo-2
| L | 1R | Danny Yassine | 5-7 3-6 |
2023 J100Santodomingo
| L | 2R | Marcos Castellanos | 6-4 1-6 2-6 |
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