| UTR Pro Takasaki Women | 2023/09/09 07:12 | Koharu Niimi v Annette Robertson | 6-1,6-2 |
| UTR Pro Takasaki Women | 2023/09/09 01:15 | Yuno Kitahara v Koharu Niimi | 6-4,6-2 |
| UTR Pro Takasaki Women | 2023/09/07 02:44 | Tomoko Kato v Koharu Niimi | 6-2,7-6 |
| UTR Pro Takasaki Women | 2023/09/06 03:00 | Sayuri Hata v Koharu Niimi | 1-6,6-3,4-6 |
| ITF - W15 Antalya | 2023/03/30 08:00 | Martha Matoula v Koharu Niimi | 6-1,6-2 |
| ITF - W15 Antalya | 2023/03/29 13:40 | Karolina Kozakova v Koharu Niimi | 1-6,3-6 |
| ITF - W15 Antalya | 2023/03/28 09:10 | Koharu Niimi v Ines Faltinger | 6-1,6-1 |
| ITF - W15 Antalya | 2023/03/27 08:50 | Xenia Bandurowska v Koharu Niimi | 4-6,5-7 |
| UTR Pro Takasaki Women | 2023/09/09 06:46 | Shigeta, Mua v Yui Owaki | 1-6,6-4,7-6 |
| UTR Pro Takasaki Women | 2023/09/09 03:00 | Kisa Yoshioka v Shigeta, Mua | 1-6,6-1,7-5 |
| UTR Pro Takasaki Women | 2023/09/07 01:30 | Uchiyama, Honoka v Shigeta, Mua | 3-6,6-4,3-6 |
| UTR Pro Takasaki Women | 2023/09/06 02:16 | Nagomi Higashitani v Shigeta, Mua | 6-3,6-2 |
| ITF W15 Sapporo | 2023/08/10 02:10 | Shigeta, Mua v Dayeon Back | 1-6,0-6 |
| ITF W15 Sapporo | 2023/08/08 02:30 | Shigeta, Mua v Yuna Kadowaki | 6-0,6-4 |
| ITF W15 Sapporo | 2023/08/02 02:20 | Shigeta, Mua v Hiromi Abe | 1-6,0-6 |
| ITF W15 Sapporo | 2023/08/01 01:00 | Shigeta, Mua v Moeka Miyata | 7-5,0-6,4-10 |