Stadium: Court 3 Round: 45
| ITF Hong Kong F3 | 2017/07/05 06:25 | Grills, Jacob v Jumpei Yamasaki | 6-2,4-6,6-0 |
| Challenger Winnipeg Qual | 2018/07/08 23:15 | Lin, Jack Mingjie v Grills, Jacob | 6-4,6-0 |
| Challenger Winnipeg Qual | 2018/07/08 20:05 | Nicaise Muamba v Grills, Jacob | 6-7,0-6 |
| ITF Canada F5 | 2018/07/07 18:50 | Grills, Jacob v Griffith, William | 6-2,4-6,4-6 |
| ITF Canada F5 | 2018/07/06 17:00 | Marc-Andrea Huesler v Grills, Jacob | 6-3,0-6,5-7 |
| ITF Canada F5 | 2018/07/05 20:45 | Boulais, Justin v Grills, Jacob | 7-5,1-6,3-6 |
| ITF Canada F5 | 2018/07/03 16:00 | Maginley, J. v Grills, Jacob | 6-7,2-6 |
| ITF Singapore F3 | 2018/05/31 06:15 | Banes, Maverick v Grills, Jacob | 6-1,7-6 |
| ITF Singapore F3 | 2018/05/28 05:00 | Yu, Cheng-Yu v Grills, Jacob | 7-6,3-6,3-6 |
| Challenger Winnipeg Qual | 2018/07/08 18:05 | Verbeek, Sem v Jumpei Yamasaki | 7-6,7-6 |
| ITF Hong Kong F1 | 2018/06/29 02:00 | Jumpei Yamasaki v Yuki Mochizuki | 4-6,4-6 |
| ITF Hong Kong F1 | 2018/06/28 02:00 | Wang, Chukang v Jumpei Yamasaki | 0-6,2-6 |
| ITF Hong Kong F1 | 2018/06/27 03:45 | Tang, Anthony Jackie v Jumpei Yamasaki | 7-5,3-6,1-6 |
| ITF Hong Kong F1 | 2018/06/26 03:15 | Wei-De Lin v Jumpei Yamasaki | 3-6,3-6 |
| ITF Korea F3 | 2018/06/22 04:55 | Soonwoo Kwon v Jumpei Yamasaki | 6-3,6-1 |
| ITF Korea F3 | 2018/06/21 02:50 | Kim, Young Seok v Jumpei Yamasaki | 6-7,4-6 |
| ITF Korea F3 | 2018/06/19 08:10 | Shin, Seung-Hun v Jumpei Yamasaki | 6-4,2-6,1-6 |