Japan: W100 Gifu - Singles - Main |
| 1/16-finals | Ito A. | Ishii S. | 1:1 RET. (4:6, 7:62, 1:0) | details | 30.04.2024 |
Japan: W100 Tokyo - Singles - Main |
| 1/16-finals | Ishii S. | Chong E. | 1:2 (6:3, 3:6, 64:7) | details | 24.04.2024 |
Japan: W35 Osaka - Singles - Main |
| Final | Fung S. | Ishii S. | 1:2 (1:6, 6:3, 3:6) | details | 14.04.2024 |
| Semi-finals | Ishii S. | Sawangkaew M. | 2:0 (7:5, 7:5) | details | 13.04.2024 |
| Quarter-finals | Ishii S. | Lee Y.-H. | 2:0 (6:4, 6:2) | details | 12.04.2024 |
| 1/8-finals | Inglis M. | Ishii S. | 1:2 (7:63, 4:6, 4:6) | details | 11.04.2024 |
| 1/16-finals | Ishii S. | Ma L. | 0:0 RET. (6:5) | details | 10.04.2024 |
Japan: W50 Kashiwa - Singles - Main |
| Quarter-finals | Hartono A. | Ishii S. | 2:1 (5:7, 6:2, 6:4) | details | 05.04.2024 |
| 1/8-finals | Sato N. | Ishii S. | 0:2 (4:6, 3:6) | details | 04.04.2024 |
| 1/16-finals | Ishii S. | Gibson T. | 2:1 (7:63, 2:6, 6:4) | details | 03.04.2024 |
USA: Miami - Singles - Qualification |
| Semi-finals | Pera B. | Ishii S. | 2:0 (6:0, 6:4) | details | 17.03.2024 |
Australia: W35 Traralgon 2 - Singles - Main |
| 1/16-finals | Lu J. | Ishii S. | 2:0 (6:2, 6:4) | details | 28.02.2024 |
Australia: W35 Traralgon - Singles - Main |
| Quarter-finals | Ishii S. | Sato N. | 0:2 (4:6, 1:6) | details | 23.02.2024 |
| 1/8-finals | Ishii S. | Bains N. | 2:0 (6:3, 6:2) | details | 22.02.2024 |
| 1/16-finals | Wei S. | Ishii S. | 0:2 (2:6, 69:7) | details | 21.02.2024 |
USA: W35 Wesley Chapel, FL - Singles - Main |
| 1/8-finals | Ishii S. | Bartha P. | 1:2 (6:1, 61:7, 2:6) | details | 08.02.2024 |
| 1/16-finals | Ishii S. | Kozyreva M. | 2:0 (6:4, 6:2) | details | 06.02.2024 |
USA: W75+H Vero Beach, FL - Singles - Main |
| 1/8-finals | Ngounoue C. | Ishii S. | 2:0 (6:4, 6:3) | details | 25.01.2024 |
| 1/16-finals | Castillo Huerta F. | Ishii S. | 0:2 (1:6, 0:6) | details | 24.01.2024 |
Thailand: W50 Nonthaburi 2 - Singles - Main |
| Semi-finals | Ishii S. | Sawangkaew M. | 1:2 (6:3, 2:6, 5:7) | details | 13.01.2024 |
| Quarter-finals | Jakupovic D. | Ishii S. | 0:2 (0:6, 0:6) | details | 12.01.2024 |
| 1/8-finals | Ishii S. | Zaytseva K. | 2:0 (6:2, 6:4) | details | 11.01.2024 |
| 1/16-finals | Kovapitukted P. | Ishii S. | 1:2 (6:4, 1:6, 0:6) | details | 10.01.2024 |
Thailand: W50 Nonthaburi - Singles - Main |
| Quarter-finals | Ishii S. | Ruzic A. | 0:2 (3:6, 2:6) | details | 05.01.2024 |
| 1/8-finals | Jakupovic D. | Ishii S. | 0:2 (2:6, 2:6) | details | 04.01.2024 |
| 1/16-finals | Liang E. S. | Ishii S. | 0:2 (1:6, 3:6) | details | 03.01.2024 |
Australia: W60 Gold Coast - Singles - Main |
| 1/8-finals | Shimizu E. | Ishii S. | 2:1 (6:4, 2:6, 6:4) | details | 30.11.2023 |
| 1/16-finals | Ishii S. | Garland J. | 2:1 (6:3, 2:6, 7:67) | details | 29.11.2023 |
Japan: W100 Takasaki 2 - Singles - Main |
| 1/16-finals | Miyazaki L. | Ishii S. | 2:0 (6:4, 6:2) | details | 21.11.2023 |
Japan: W100 Takasaki - Singles - Main |
| 1/16-finals | Hontama M. | Ishii S. | 2:0 (6:1, 6:3) | details | 14.11.2023 |
USA: W60 Rancho Santa Fe, CA - Singles - Main |
| Quarter-finals | Ishii S. | Tikhonova A. | 0:2 (2:6, 2:6) | details | 13.10.2023 |
| 1/8-finals | Riera J. | Ishii S. | 0:2 (3:6, 4:6) | details | 12.10.2023 |
| 1/16-finals | Herazo Gonzalez M. | Ishii S. | 0:1 RET. (3:6, 0:4) | details | 11.10.2023 |
USA: W25 Redding, CA - Singles - Main |
| Final | Ishii S. | Jovic I. | 0:2 (4:6, 2:6) | details | 08.10.2023 |
| Semi-finals | Ishii S. | Grant T. C. | 2:0 (6:2, 6:4) | details | 07.10.2023 |
| Quarter-finals | Ishii S. | McKenzie K. | 2:1 (4:6, 7:5, 6:0) | details | 06.10.2023 |
| 1/8-finals | Ishii S. | Kozyreva M. | 2:1 (62:7, 6:3, 6:1) | details | 05.10.2023 |
| 1/16-finals | Udvardy P. | Ishii S. | 1:2 (3:6, 6:3, 1:6) | details | 03.10.2023 |
Japan: Tokyo - Singles - Qualification |
| Semi-finals | Dart H. | Ishii S. | 2:1 (4:6, 6:1, 6:3) | details | 23.09.2023 |