Stadium: Court 1 Round: 45
| ITF Japan F5 | 2018/04/02 03:10 | Shintaro Imai v Jacob Grills | 6-1,6-1 |
| ITF Japan F4 | 2018/03/30 01:00 | Renta Tokuda v Jacob Grills | 6-3,6-2 |
| ITF Japan F4 | 2018/03/29 01:00 | Chuhan Wang v Jacob Grills | 6-2,3-6,4-6 |
| ITF Japan F4 | 2018/03/27 01:00 | Jacob Grills v Shuichi Sekiguchi | 7-6,4-6,6-3 |
| Challenger Qujing Qual | 2018/03/17 02:00 | Rui-Xuan Wang v Jacob Grills | 3-6,7-6,6-2 |
| Challenger Shenzhen Qual | 2018/03/11 02:45 | Jacob Grills v Yusuke Takahashi | 4-6,6-4,2-6 |
| Challenger Zhuhai Qual | 2018/03/04 03:45 | Jacob Grills v Gerard Granollers-Pujol | 2-6,6-4,2-6 |
| Challenger Zhuhai Qual | 2018/03/03 05:20 | Jacob Grills v Jie Cui | 6-4,7-6 |
| Challenger Qujing | 2018/03/20 04:45 | Malek Jaziri v Yunseong Chung | 6-2,6-4 |
| Challenger Qujing Qual | 2018/03/18 05:45 | Yunseong Chung v Mikhail Elgin | 6-3,6-7,6-3 |
| Challenger Shenzhen Qual | 2018/03/11 06:00 | Yunseong Chung v Gianluigi Quinzi | 6-7,6-3,5-7 |
| Challenger Zhuhai Qual | 2018/03/04 08:35 | Alex Bolt v Yunseong Chung | 6-4,6-2 |
| Challenger Zhuhai Qual | 2018/03/03 06:50 | Yunseong Chung v Andrea Vavassori | 6-3,4-6,6-3 |
| Challenger Yokohama | 2018/02/27 02:25 | Yunseong Chung v Jason Jung | 2-6,7-6,4-6 |
| Challenger Yokohama Qual | 2018/02/26 04:05 | Makoto Ochi v Yunseong Chung | 3-6,6-1,1-6 |
| Challenger Yokohama Qual | 2018/02/25 02:35 | Yunseong Chung v Takuto Niki | 6-7,6-3,6-3 |