Sayaka Ishii
2023
| US OPEN JUNIOR | [3] | 3R |
| WIMBLEDON JUNIOR | [7] | Quarter |
| J300 ROEHAMPTON | [5] | Semi |
| ROLAND GARROS JUNIOR | [5] | 1R |
| J500 MILAN | [6] | Semi |
| AUSTRALIAN OPEN JUNIOR | [12] | Semi |
| J300 TRARALGON | [5] | Quarter |
2022
| JAPLANTATION | [4] | 1R |
| J1 BRADENTON | [3] | Semi |
| JAMERIDA | [3] | 2R |
| JAOSAKA | [2] | Final |
| US OPEN JUNIOR | 1R | |
| J1 COLLEGEPARK | [6] | 2R |
| WIMBLEDON JUNIOR | 2R | |
| J1 ROEHAMPTON | Semi | |
| ROLAND GARROS JUNIOR | 1R | |
| JAMILAN | 2R | |
| J1 SANDIEGO | [4] | Quarter |
| J1 LIMA | [1] | Semi |
| J1 SALINAS | [6] | 2R |
| J1 BARRANQUILLA | [11] | Win |
| J1 SANJOSE | [7] | Semi |
2021
| JAPLANTATION | 2R | |
| J1 BRADENTON | 2R | |
| JAMERIDA | 3R | |
| J1 GUADALAJARA | Quarter | |
| J4 BOCARATON | [2] | (continue) |
| J3 ZAPOPAN | [5] | 3R |
| J4 MIKI-CITY-2 | [1] | Win |
| J4 MIKI-CITY | [1] | Semi |
2020
| J3 SAITAMA | [4] | Quarter |
Nation
JPN
Age
20 years old (born in 2005)
World Ranking
WTA Ranking　242th
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 J300 ROEHAMPTON
| W | 1R | Valeria Ray | 5-7 6-3 6-0 |
| W | 2R | Zuzanna Pawlikowska | 7-6 6-4 |
| W | 3R | Mimi Xu | 6-4 6-2 |
| W | QF | Clervie Ngounoue | 6-3 3-6 6-4 |
| L | SF | Renata Jamrichova | 6-7 3-6 |
2023 ROLAND GARROS JUNIOR
| L | 1R | Teodora Kostovic | 6-7 2-6 |
2023 J500 MILAN
| W | 1R | Cara Maria Mester | 6-1 6-3 |
| W | 2R | Malwina Rowinska | 6-4 6-1 |
| W | 3R | Tereza Valentova | 3-6 6-1 4-2 |
| W | QF | Liam Oved | 4-6 6-1 7-5 |
| L | SF | Kaitlin Quevedo | 1-6 1-6 |
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 |
2023 J300 TRARALGON
| W | 1R | Francesca Pace | 5-7 6-1 6-2 |
| W | 2R | Shruti Ahlawat | 5-7 6-1 6-0 |
| W | 3R | Alevtina Ibragimova | 7-5 6-3 |
| L | QF | Renata Jamrichova | 4-6 7-6 2-6 |
2022 JAPLANTATION
| L | 1R | Hephzibah Oluwadare | 3-6 5-7 |
2022 J1 BRADENTON
| W | 1R | Tyra Caterina Grant | 1-6 6-3 6-3 |
| W | 2R | Gaeul Jang | 6-4 6-4 |
| W | 3R | Maelie Monfils | 4-6 6-3 6-1 |
| W | QF | Tatum Evans | 6-2 6-2 |
| L | SF | Tereza Valentova | 6-7 7-6 6-7 |
2022 JAMERIDA
| W | 1R | Daniela Livson | 6-4 6-1 |
| L | 2R | Teodora Kostovic | 3-6 3-6 |
2022 JAOSAKA
| W | 1R | Himari Hayashi | 6-3 6-3 |
| W | 2R | Emily Sartz-Lunde | 6-0 6-2 |
| W | 3R | Lily Fairclough | 6-2 6-0 |
| W | QF | Amelie Smejkalova | 7-5 6-2 |
| W | SF | Emerson Jones | 6-3 6-2 |
| L | F | Sara Saito | 2-6 4-6 |
2022 US OPEN JUNIOR
| L | 1R | Iva Jovic | 4-6 2-6 |
2022 J1 COLLEGEPARK
| W | 1R | Shivaani Selvan | 6-4 6-0 |
| L | 2R | Dana Baidaulet | 6-7 7-6 6-7 |
2022 WIMBLEDON JUNIOR
| W | 1R | Tereza Valentova | 6-1 6-3 |
| L | 2R | Ella Seidel | 4-6 6-7 |
2022 J1 ROEHAMPTON
| W | 1R | Nina Vargova | 7-6 7-6 |
| W | 2R | Sandugash Kenzhibayeva | 6-1 6-4 |
| W | 3R | Mimi Xu | 6-1 7-5 |
| W | QF | Weronika Ewald | 6-1 3-6 6-4 |
| L | SF | Johanne Christine Svendsen | 4-6 1-6 |
2022 ROLAND GARROS JUNIOR
| L | 1R | Nikola Daubnerova | 4-6 5-7 |
2022 JAMILAN
| W | 1R | Erika Di Muzio | 6-2 6-1 |
| L | 2R | Sofia Costoulas | 3-6 3-6 |
2022 J1 SANDIEGO
| W | 1R | Athena Rosas-Pacifico | 6-2 6-1 |
| W | 2R | Sophie Williams | 6-1 6-4 |
| W | 3R | Elisabeth Jones | 6-2 6-0 |
| L | QF | Katie Codd | 2-6 5-7 |
2022 J1 LIMA
| W | 1R | Alessia Martinez | 6-1 6-3 |
| W | 2R | Victoria Osuigwe | 6-4 6-4 |
| W | QF | Leyla Fiorella Britez Risso | 6-2 4-6 6-1 |
| L | SF | Nikola Daubnerova | 3-6 4-6 |
2022 J1 SALINAS
| W | 1R | Ashton Bowers | 6-3 7-5 |
| L | 2R | Naomi Xu | 0-6 4-6 |
2022 J1 BARRANQUILLA
| W | 2R | Nadezda Khalturina | 6-1 6-2 |
| W | 3R | Ava Krug | 6-2 2-6 6-0 |
| W | QF | Nikola Daubnerova | 6-3 1-6 7-6 |
| W | SF | Krystal Blanch | 7-6 6-3 |
| W | F | Olivia Lincer | 6-3 6-2 |
2022 J1 SANJOSE
| W | 1R | Taylor Goetz | 1-6 6-4 6-3 |
| W | 2R | Orly Ogilvy | 6-3 0-6 7-5 |
| W | QF | Gabriella Broadfoot | 6-3 2-6 6-3 |
| L | SF | Sonya Macavei | 6-4 4-6 1-6 |
2021 JAPLANTATION
| W | 1R | Elisabeth Jones | 7-5 6-3 |
| L | 2R | Brenda Fruhvirtova | 1-6 4-6 |
2021 J1 BRADENTON
| W | 1R | Rozalia Gruszczynska | 6-0 4-6 6-1 |
| L | 2R | Kristina Dmitruk | 3-6 3-6 |
2021 JAMERIDA
| W | 1R | Alexia Harmon | 6-3 4-6 7-5 |
| W | 2R | Johanne Christine Svendsen | 6-3 6-2 |
| L | 3R | Lucija Ciric Bagaric | 6-7 6-3 2-6 |
2021 J1 GUADALAJARA
| W | 1R | Mia Slama | 7-5 6-4 |
| W | 2R | Luana Avelar | 6-4 6-0 |
| W | 3R | Masha Alexandra Vrsalovic Gimenez | 6-4 7-6 |
| L | QF | Marina Stakusic | 4-6 0-6 |
2021 J4 BOCARATON
| W | 1R | Erica Jessel | 7-5 6-1 |
| W | 2R | Daniela Livson | 7-6 6-3 |
| W | QF | Sophia Wang | 6-2 |
| W | SF | Yujin Kim | 7-5 6-4 |
2021 J3 ZAPOPAN
| W | 1R | Sofia Prieto | 6-4 6-1 |
| W | 2R | Lya Fernandez | 6-0 6-3 |
| L | 3R | Carla Pacot | 6-2 2-6 3-6 |
2021 J4 MIKI-CITY-2
| W | 1R | Rinka Hari | 6-3 6-0 |
| W | 2R | Mona Narita | 6-0 6-2 |
| W | QF | Reina Goto | 6-3 6-0 |
| W | SF | Hayu Kinoshita | 6-2 6-0 |
| W | F | Sara Saito | 6-3 6-4 |
2021 J4 MIKI-CITY
| W | 1R | Aoka Nagasawa | 6-1 6-0 |
| W | 2R | Himari Hayashi | 6-0 6-0 |
| W | QF | Kayo Nishimura | 7-6 7-5 |
| L | SF | Hayu Kinoshita | 7-5 2-6 3-6 |
2020 J3 SAITAMA
| W | 1R | Ena Koike | 6-3 6-3 |
| W | 2R | Ayaka Hasegawa | 6-2 6-4 |
| L | QF | Yura Nakagawa | 3-6 3-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 9852, Number of registered players: 6,147, Number of registered results: 340,807