Stadium: Court G Round: 46 Ground: Hardcourt indoor
| ITF Thailand F5 | 2017/08/07 05:45 | Issei Okamura v Jacob Grills | 3-6,4-6 |
| Challenger Kobe | 2018/11/10 04:40 | Jacob Grills v Matej Sabanov | 7-6,5-7,6-1 |
| Challenger Canberra 2 | 2018/11/01 23:00 | Maxime Janvier v Jacob Grills | 7-6,6-4 |
| Challenger Canberra 2 | 2018/10/31 00:35 | Sadio Doumbia v Jacob Grills | 6-7,6-3,3-6 |
| Challenger Canberra 2 | 2018/10/29 03:55 | Jacob Grills v Hiroki Moriya | 4-6,6-4,6-1 |
| Challenger Traralgon | 2018/10/22 02:20 | Sebastian Fanselow v Jacob Grills | 6-3,6-3 |
| ITF Australia F8 | 2018/10/12 00:00 | Maverick Banes v Jacob Grills | 6-4,6-2 |
| ITF Australia F8 | 2018/10/11 05:20 | Michael Look v Jacob Grills | 6-7,1-6 |
| ITF Australia F8 | 2018/10/10 01:00 | Jesse Flores v Jacob Grills | 6-7,1-6 |
| Challenger Kobe | 2018/11/10 03:25 | Yuichi Ito v Issei Okamura | 4-6,7-6,3-6 |
| ITF Australia F8 | 2018/10/09 00:00 | Moerani Bouzige v Issei Okamura | 7-5,6-1 |
| ITF Australia F7 | 2018/10/04 03:55 | Benjamin Mitchell v Issei Okamura | 6-4,1-6,6-1 |
| ITF Australia F7 | 2018/10/02 00:00 | Issei Okamura v Vincent Stouff | 6-4,6-4 |
| ITF Australia F6 | 2018/09/25 00:30 | Connor Farren v Issei Okamura | 3-6,7-6,6-2 |
| ITF Australia F5 | 2018/09/21 01:00 | Brydan Klein v Issei Okamura | 6-3,6-2 |
| ITF Australia F5 | 2018/09/20 03:55 | Aaron Addison v Issei Okamura | 2-6,7-6,2-6 |
| ITF Australia F5 | 2018/09/18 00:00 | Scott Puodziunas v Issei Okamura | 6-7,7-5,4-6 |