Rira Kosaka
2025
2024
| J100Hongkong | 1R | |
| J60Changhua-2 | [3] | Final |
| J60Changhua | [4] | 2R |
| J300Wanju | 3R | |
| J100Kawaguchi | 1R | |
| J200Sydney | 2R | |
| J30Yamanashi | [1] | Quarter |
| J60Mikicity | [2] | Semi |
| J100Plantation | [8] | 3R |
| J100Coralgables,Fl | [12] | 3R |
| J100Delraybeach | [11] | 1R |
| J60Bayamon | [4] | Win |
| J30Bayamon | [1] | Win |
2023
| J30Matsuyama | [5] | Semi |
| J30Gifu | [5] | 2R |
| J60Mikicity-2 | [2] | Semi |
| J60Mikicity | [4] | Final |
Nation
JPN
Generation
Born in 2008 (16-17 years old)
World Ranking
Junior World Ranking　343th
Year-end Junior World Ranking
- Year-end 2024 347th
- Year-end 2023 920th
- Year-end 2022 512th
- Year-end 2021 2183th
Rival
Manon Favier (0-2)
Addison Iacono (2-0)
Sarah Ye (2-0)
Natsuki Yamagami (2-0)
Kanon Sawashiro (0-2)
Match Details
2025 J100Sousse
| W | 1R | Rined Saafi | 7-5 6-1 |
| W | 2R | Anna Kartseva | 7-6 6-3 |
| W | QF | Angelica Sara | 6-2 4-6 6-4 |
| W | SF | Ellen Hirschi | 6-4 7-5 |
| W | F | Eva Kaliadina | 6-1 3-6 6-3 |
2025 J300Nonthaburi
| L | 1R | Alisa Terentyeva | 1-6 1-6 |
2025 J200Nonthaburi
| W | 1R | Lidia Podgorichani | 1-6 6-2 7-6 |
| L | 2R | Maayan Laron | 5-7 4-6 |
2025 J200Kolkata
| W | 1R | Albina Kakenova | 6-1 6-4 |
| L | 2R | Yesung Choo | 6-7 0-6 |
2025 J200Chandigarh
| L | 1R | Manon Favier | 2-6 3-6 |
2025 J300Newdelhi
| L | 1R | Manon Favier | 6-7 2-6 |
2024 J100Hongkong
| L | 1R | Anastasia Efremova | 6-3 3-6 4-6 |
2024 J60Changhua-2
| W | 1R | Yan Rong Tzeng | 5-7 6-2 6-2 |
| W | 2R | Min Jen Huang | 6-2 7-6 |
| W | QF | Yi-Ching Huang | 6-3 6-3 |
| W | SF | Yeseo Park | 6-7 6-4 7-6 |
| L | F | Tennielle Madis | 0-6 4-6 |
2024 J60Changhua
| W | 1R | Siang-Ling Yang | 6-4 6-4 |
| L | 2R | Yu-Ching Wang | 7-5 3-6 6-7 |
2024 J300Wanju
| W | 1R | Malaylack Delilah Pathummakuronen | 6-7 6-3 6-1 |
| W | 2R | Yu-Chen Lin | 6-4 6-7 6-3 |
| L | 3R | Kanon Sawashiro | 6-2 5-7 4-6 |
2024 J100Kawaguchi
| L | 1R | Gabrielle Villegas | 2-6 6-4 3-6 |
2024 J200Sydney
| W | 1R | Brooke Komorowski | 6-3 6-2 |
| L | 2R | Renee Alame | 2-6 3-6 |
2024 J30Yamanashi
| W | 1R | Risa Ookoshi | 4-6 6-3 7-6 |
| W | 2R | Natsuki Yamagami | 6-4 6-2 |
| L | QF | Mina Kono | 3-6 6-4 9-11 |
2024 J60Mikicity
| W | 1R | Yuki Nishikawa | 6-1 6-3 |
| W | 2R | Natsuki Yamagami | 6-4 4-6 7-6 |
| W | QF | Yuka Naito | 6-4 4-6 7-5 |
| L | SF | Amina Salibayeva | 6-7 4-6 |
2024 J100Plantation
| W | 1R | Sarah Ye | 6-4 6-4 |
| W | 2R | Katerina Shabashkevich | 6-0 6-1 |
| L | 3R | Vessa Turley | 2-6 4-6 |
2024 J100Coralgables,Fl
| W | 1R | Sydney Barnhart | 6-3 6-4 |
| W | 2R | Thea Latak | 7-6 6-1 |
| L | 3R | Sara Shumate | 6-1 4-6 3-6 |
2024 J100Delraybeach
| L | 1R | Zaire Clarke | 2-6 3-6 |
2024 J60Bayamon
| W | 2R | Lila Bodur | 6-0 6-1 |
| W | 3R | Addison Iacono | 6-0 6-3 |
| W | QF | Sarah Ye | 6-7 6-2 6-4 |
| W | SF | Nicole Okhtenberg | 6-3 6-4 |
| W | F | Kaia Giribalan | 6-4 6-3 |
2024 J30Bayamon
| W | 2R | Arina Vansovich | 6-3 6-2 |
| W | 3R | Simran Makker | 6-3 6-0 |
| W | QF | Kaya Baker | 6-1 6-2 |
| W | SF | Karolina Lincer | 7-5 6-2 |
| W | F | Addison Iacono | 6-2 6-2 |
2023 J30Matsuyama
| W | 1R | Miyu Sakai | 6-4 6-1 |
| W | 2R | Chiharu Abe | 6-3 6-0 |
| W | QF | Ayane Takagi | 6-2 6-0 |
| L | SF | Risa Ueno | 4-6 1-6 |
2023 J30Gifu
| W | 1R | Naomi Hagi | 6-3 6-0 |
| L | 2R | Yui Komada | 1-6 4-6 |
2023 J60Mikicity-2
| W | 1R | Cocomi Saito | 3-6 6-1 6-3 |
| W | 2R | Yui Komada | 6-3 6-3 |
| W | QF | Yuki Morishita | 7-6 6-1 |
| L | SF | Risa Ueno | 4-6 3-6 |
2023 J60Mikicity
| W | 1R | Rio Otaki | 4-6 6-1 6-1 |
| W | 2R | Yui Ueda | 6-3 6-3 |
| W | QF | Uta Asakura | 6-2 6-4 |
| W | SF | Hinata Furutani | 6-4 6-1 |
| L | F | Kanon Sawashiro | 2-6 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