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