Stadium: Court B Round: 26 Ground: Hardcourt indoor
| Hamamatsu, Singles W-WITF-JPN-12A | 2018/10/18 03:30 | Ushijima, Risa v Mei Yamaguchi | 1-6,1-6 |
| Karuizawa, Singles W-WITF-JPN-10A | 2018/05/24 01:15 | Mei Yamaguchi v Ushijima, Risa | 3-6,7-5,7-6 |
| ITF W60 Kyoto | 2020/02/19 02:15 | Matsumoto, Ari v Mei Yamaguchi | 5-7,2-6 |
| Nonthaburi, Singles W-ITF-THA-01A | 2020/01/26 07:00 | Mei Yamaguchi v Zakarlyuk, Marianna | 7-5,5-7,7-10 |
| Hong Kong, Simples W-ITF-HKG-01B | 2020/01/09 04:25 | Mei Yamaguchi v Jana Fett | 1-6,0-6 |
| Hong Kong, Simples W-ITF-HKG-01B | 2020/01/08 06:00 | Mei Yamaguchi v Cao, Siqi | 6-3,2-6,6-1 |
| Hong Kong, Simples W-ITF-HKG-01B | 2020/01/07 03:50 | Emily Fanning v Mei Yamaguchi | 0-6,4-6 |
| Hong Kong, Simples W-ITF-HKG-01B | 2020/01/06 02:00 | Kozaki, Mio v Mei Yamaguchi | 3-6,1-6 |
| Hong Kong, Simples W-ITF-HKG-01B | 2020/01/02 02:00 | Lin Zhu v Mei Yamaguchi | 6-0,6-2 |
| Hong Kong, Simples W-ITF-HKG-01B | 2020/01/01 04:55 | Mei Yamaguchi v Hradecka, Lucie | 6-3,3-6,7-5 |
| ITF W60 Kyoto | 2020/02/19 06:00 | Ushijima, Risa v Arina Rodionova | 6-4,1-6,7-6 |
| Launceston, Singles Qualifying W-ITF-AUS-03A | 2020/02/03 22:55 | Alexandra Bozovic v Ushijima, Risa | 6-1,4-6,6-4 |
| Burnie, Simples W-ITF-AUS-02A | 2020/01/27 23:00 | Ushijima, Risa v Himari Sato | 0-6,2-6 |
| ITF W25 Vero Beach | 2020/01/20 16:00 | Eleana Yu v Ushijima, Risa | 7-5,6-0 |
| ITF W25 Daytona Beach | 2020/01/12 16:00 | Maria Lourdes Carle v Ushijima, Risa | 6-4,6-1 |
| ITF W25 Navi Mumbai | 2019/12/17 09:30 | Ushijima, Risa v Luangnam, Nudnida | 7-5,3-6,2-6 |
| ITF W25 Pune | 2019/12/12 05:30 | Ushijima, Risa v Talbi, Shalimar | 6-7,5-7 |
| ITF W25 Pune | 2019/12/10 05:00 | Ekaterina Yashina v Ushijima, Risa | 4-6,5-7 |