Sayaka Ishii
2023
| Us Open Junior | [3] | 3R |
| Wimbledon Junior | [7] | Quarter |
| Roland Garros Junior | [5] | 1R |
| Australian Open Junior | [12] | Semi |
2022
Nation
JPN
Age
19 years old (born in 2005)
World Ranking
WTA Ranking　198th
Year-end Junior World Ranking
- Year-end 2023 8th
- Year-end 2022 13th
- Year-end 2021 131th
- Year-end 2020 314th
- Year-end 2019 523th
- Year-end 2018 2423th
Match Details
2023 Us Open Junior
| W | 1R | Annika Penickova | 6-3 3-6 6-3 |
| W | 2R | Victoria Osuigwe | 2-6 6-3 6-4 |
| L | 3R | Hannah Klugman | 4-6 1-6 |
2023 Wimbledon Junior
| W | 1R | Valeria Ray | 6-0 6-1 |
| W | 2R | Laura Samson | 6-3 6-2 |
| W | 3R | Hannah Klugman | 6-4 6-4 |
| L | QF | Clervie Ngounoue | 4-6 5-7 |
2023 Roland Garros Junior
| L | 1R | Teodora Kostovic | 6-7 2-6 |
2023 Australian Open Junior
| W | 1R | Ahmani Guichard | 6-3 6-3 |
| W | 2R | Onyu Choi | 6-0 6-1 |
| W | 3R | Nina Vargova | 6-3 6-1 |
| W | QF | Alevtina Ibragimova | 7-6 6-4 |
| L | SF | Alina Korneeva | 6-2 4-6 2-6 |
2022 Us Open Junior
| L | 1R | Iva Jovic | 4-6 2-6 |
2022 Wimbledon Junior
| W | 1R | Tereza Valentova | 6-1 6-3 |
| L | 2R | Ella Seidel | 4-6 6-7 |
2022 Roland Garros Junior
| L | 1R | Nikola Daubnerova | 4-6 5-7 |
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