Stadium: I Round: 25 Ground: Hardcourt outdoor
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/19 01:00 | Mei Yamaguchi v Chimura, Momoka | 6-4,6-1 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/18 01:00 | Mei Yamaguchi v Sueno, Satoko | 6-1,6-2 |
| Nishi-Tama, Singles W-WITF-JPN-01A | 2018/03/17 01:00 | Mei Yamaguchi v Koshino, Natsumi | 6-2,6-0 |
| ITF Women Toyota Qual | 2018/03/11 03:30 | Shiho Akita v Mei Yamaguchi | 6-3,6-1 |
| ITF Women Toyota Qual | 2018/03/10 03:00 | Mana Ayukawa v Mei Yamaguchi | 4-6,2-6 |
| Yokohama, Singles Qualifying W-WITF-JPN-01B | 2018/03/06 01:00 | Mai Hontama v Mei Yamaguchi | 6-2,7-6 |
| Yokohama, Singles Qualifying W-WITF-JPN-01B | 2018/03/04 07:00 | Mei Yamaguchi v Chihiro Muramatsu | 6-4,6-4 |
| ITF Women Tokyo | 2017/11/09 03:15 | Mei Yamaguchi v Su Jeong Jang | 5-7,4-6 |
| Yokohama, Singles Qualifying W-WITF-JPN-01B | 2018/03/04 07:30 | Moyuka Uchijima v Tanaka, Yuuki | 2-6,6-2,6-1 |
| ITF Women Perth Qual | 2018/02/11 02:00 | Monique Barry v Tanaka, Yuuki | 2-6,1-6 |
| Launceston, Qualifications Simples W-WITF-AUS-02B | 2018/02/07 01:45 | Minokoshi, Mai v Tanaka, Yuuki | 6-7,6-4,6-4 |
| ITF Women Launceston Qual | 2018/02/04 23:00 | Tanaka, Yuuki v Maddison Inglis | 6-1,3-6,6-2 |
| ITF Women Launceston Qual | 2018/02/03 23:00 | Tanaka, Yuuki v Catherine Krueger | 6-0,6-0 |
| Burnie, Qualifications Simples W-WITF-AUS-01C | 2018/01/28 01:20 | Xiyu Wang v Tanaka, Yuuki | 6-4,6-7,6-1 |
| ITF Women Hong Kong | 2018/01/05 02:00 | Tanaka, Yuuki v Hiroko Kuwata | 4-6,1-6 |
| ITF Women Hong Kong | 2018/01/04 02:00 | Tanaka, Yuuki v Ng, Kwan Yau | 3-6,6-3,6-1 |