| Challenger Toyota | 2017/11/13 01:00 | Jumpei Yamasaki v Yuta Shimizu | 3-6,2-6 |
| Challenger Kobe Qual | 2017/11/04 07:20 | Lucas Miedler v Jumpei Yamasaki | 6-4,6-1 |
| ITF Thailand F9 | 2017/10/19 03:00 | Jumpei Yamasaki v Tung-Lin Wu | 4-6,0-6 |
| ITF Thailand F9 | 2017/10/18 04:20 | Jumpei Yamasaki v Skyler Butts | 6-2,6-3 |
| ITF Thailand F9 | 2017/10/16 03:00 | Jumpei Yamasaki v Clement Larriere | 4-6,6-3,6-3 |
| ITF Thailand F8 Qual | 2017/10/08 04:55 | Jumpei Yamasaki v Jirat Navasirisomboon | 3-6,6-3,3-6 |
| Challenger Stockton Qual | 2017/09/30 17:00 | Eric James Johnson v Jumpei Yamasaki | 4-6,7-6,6-1 |
| ITF USA F32 | 2017/09/28 19:15 | Henry Craig v Jumpei Yamasaki | 3-6,6-4,6-3 |
| ITF Thailand F12 Qual | 2017/12/09 05:30 | Cheong Hwi Kim v Sung Jun Park | 1-6,1-6 |
| ITF Korea F5 | 2017/06/28 06:40 | Hong Chung v Sung Jun Park | 6-0,1-6,6-0 |
| ITF Korea F5 | 2017/06/27 01:30 | Ho-Min Kang v Sung Jun Park | 4-6,2-6 |
| ITF Korea F5 | 2017/06/26 03:30 | Byeonghun Kim v Sung Jun Park | 0-6,6-3,0-6 |
| ITF Korea F4 | 2017/06/20 02:20 | Jung-Woong Na v Sung Jun Park | 6-4,6-3 |
| ITF Korea F4 | 2017/06/19 01:00 | Sung Jun Park v Ho-Min Kang | 6-0,6-0 |
| ITF Korea F4 | 2017/06/18 02:00 | Woo Young Lee v Sung Jun Park | 1-6,2-6 |
| ITF Korea F3 Qual | 2017/06/10 03:00 | Sung Jun Park v Sang Yeop Kim | 2-6,2-6 |