Stadium: Show court Round: 25 Ground: Hardcourt outdoor
| ITF Japan F7 | 2018/06/07 03:50 | Inoue, Haru v Kawahashi, Yuta | 6-3,4-6,7-6 |
| ITF Japan F7 | 2018/06/04 01:00 | Kawakami, Rimpei v Kawahashi, Yuta | 4-6,3-6 |
| ITF Japan F5 | 2018/04/04 05:35 | Kawahashi, Yuta v Tanuma, Ryota | 6-3,1-6,4-6 |
| ITF Japan F5 | 2018/04/03 05:35 | Duckhee Lee v Kawahashi, Yuta | 6-7,6-7 |
| ITF Japan F5 | 2018/03/31 03:30 | Issei Okamura v Kawahashi, Yuta | 3-6,1-6 |
| ITF Japan F4 | 2018/03/27 01:00 | Kawahashi, Yuta v Shintaro Imai | 3-6,3-6 |
| ITF Japan F3 | 2018/03/18 01:00 | Masamichi Imamura v Kawahashi, Yuta | 7-5,6-2 |
| ITF Japan F3 | 2018/03/17 02:30 | Kawahashi, Yuta v Seol, Jae-Min | 6-2,6-3 |
| ITF Chinese Taipei F1 Qual | 2018/07/16 02:00 | Barclay, David v Alex Hunt | 4-6,6-0,6-4 |
| ITF China F10 Qual | 2018/07/08 02:00 | Jeong, Young-Hoon v Barclay, David | 6-1,6-3 |
| ITF China F10 Qual | 2018/07/07 02:00 | Tang, Leo v Barclay, David | 1-6,0-6 |
| ITF China F9 Qual | 2018/07/01 02:00 | Barclay, David v Kousuke Ogura | 6-4,1-6,3-6 |
| ITF China F9 Qual | 2018/06/30 02:00 | Barclay, David v Duan, Jia Qi | 6-1,6-4 |
| ITF Guam F1 | 2018/06/21 00:00 | Ito, Yuichi v Barclay, David | 6-2,6-2 |
| ITF Guam F1 | 2018/06/20 00:00 | Numajiri, Keisuke v Barclay, David | 6-1,2-6,2-6 |
| ITF Japan F8 | 2018/06/09 01:00 | Matsuzaki, Yutaro v Barclay, David | 1-6,6-4,6-3 |