Stadium: Stadium Round: 27
| Challenger Kobe | 2018/11/12 02:00 | Blake Ellis v Colin Sinclair | 4-6,4-6 |
| Challenger Kobe | 2018/11/11 04:40 | Taisei Ichikawa v Colin Sinclair | 4-6,4-6 |
| Challenger Kobe | 2018/11/10 07:35 | Itsuki Matsumoto v Colin Sinclair | 4-6,1-6 |
| Challenger Canberra 2 | 2018/10/26 23:50 | Colin Sinclair v Harry Bourchier | 2-6,4-6 |
| Challenger Traralgon | 2018/10/21 23:00 | Yosuke Watanuki v Colin Sinclair | 6-3,7-5 |
| Challenger Traralgon | 2018/10/21 05:00 | Moerani Bouzige v Colin Sinclair | 4-6,1-6 |
| Challenger Traralgon | 2018/10/21 01:50 | Calum Puttergill v Colin Sinclair | 4-6,1-6 |
| ITF Australia F8 | 2018/10/14 03:45 | Maverick Banes v Colin Sinclair | 6-4,6-2 |
| ITF USA F26 | 2018/09/25 17:00 | George Goldhoff v Emilio Nava | 3-6,1-6 |
| ITF USA F26 Qual | 2018/09/24 17:00 | George Goldhoff v Govind Nanda | 1-6,2-6 |
| ITF USA F26 Qual | 2018/09/23 17:00 | George Goldhoff v Francis Pare | 3-6,6-3,6-4 |
| ITF USA F26 Qual | 2018/09/21 21:30 | George Goldhoff v Kaptan Kaster | 6-1,6-3 |
| ITF USA F24 | 2018/09/09 18:00 | George Goldhoff v Stefan Leustian | 6-2,5-7,6-7 |
| ITF USA F24 | 2018/09/08 16:00 | George Goldhoff v August Holmgren | 7-5,6-4 |
| ITF Israel F2 | 2018/03/15 11:55 | Yshai Oliel v George Goldhoff | 6-7,6-1,6-1 |
| ITF Israel F2 | 2018/03/14 13:30 | George Goldhoff v Mor Bulis | 7-6,6-4 |