Stadium: I Round: 25 Ground: Hardcourt outdoor
| ITF Women Nishi-Tama | 2018/03/19 01:00 | Mei Yamaguchi v Momoka Chimura | 6-4,6-1 |
| ITF Women Nishi-Tama | 2018/03/18 01:00 | Mei Yamaguchi v Satoko Sueno | 6-1,6-2 |
| ITF Women Nishi-Tama | 2018/03/17 01:00 | Mei Yamaguchi v Natsumi Koshino | 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 |
| ITF Women Yokohama Qual | 2018/03/06 01:00 | Mai Hontama v Mei Yamaguchi | 6-2,7-6 |
| ITF Women Yokohama Qual | 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 |
| ITF Women Yokohama Qual | 2018/03/04 07:30 | Moyuka Uchijima v Yuuki Tanaka | 2-6,6-2,6-1 |
| ITF Women Perth Qual | 2018/02/11 02:00 | Monique Barry v Yuuki Tanaka | 2-6,1-6 |
| ITF Women Launceston | 2018/02/07 01:45 | Mai Minokoshi v Yuuki Tanaka | 6-7,6-4,6-4 |
| ITF Women Launceston Qual | 2018/02/04 23:00 | Yuuki Tanaka v Maddison Inglis | 6-1,3-6,6-2 |
| ITF Women Launceston Qual | 2018/02/03 23:00 | Yuuki Tanaka v Catherine Krueger | 6-0,6-0 |
| ITF Women Burnie Qual | 2018/01/28 01:20 | Xiyu Wang v Yuuki Tanaka | 6-4,6-7,6-1 |
| ITF Women Hong Kong | 2018/01/05 02:00 | Yuuki Tanaka v Hiroko Kuwata | 4-6,1-6 |
| ITF Women Hong Kong | 2018/01/04 02:00 | Yuuki Tanaka v Kwan Yau Ng | 3-6,6-3,6-1 |