Stadium: Stadium Round: 27
| ITF M15 Claremont | 2019/02/07 19:35 | Sinclair, Colin v Lu, Tyler | 6-3,6-3 |
| ITF M15 Claremont | 2019/02/06 20:45 | Sinclair, Colin v Gamble, Luke Jacob | 6-2,6-3 |
| Challenger Canberra | 2019/01/06 23:00 | Doumbia, Sadio v Sinclair, Colin | 6-3,6-4 |
| Challenger Noumea | 2019/01/03 07:00 | Sinclair, Colin v Ymer, Mikael | 3-6,2-6 |
| Challenger Noumea | 2019/01/01 23:00 | Rola, Blaz v Sinclair, Colin | 5-7,4-6 |
| Challenger Noumea | 2018/12/31 01:15 | Maxime Chazal v Sinclair, Colin | 4-6,4-6 |
| Open d'Australie Playoff Wilcard Australienne | 2018/11/30 02:00 | Sinclair, Colin v Zhang, Ze | 1-6,1-6 |
| Open d'Australie Playoff Wilcard Australienne | 2018/11/28 03:25 | Wu, Di v Sinclair, Colin | 2-6,3-6 |
| ITF M15 Claremont | 2019/02/07 18:00 | Brymer, Gage v George Goldhoff | 4-6,4-6 |
| ITF M15 Claremont | 2019/02/06 19:35 | George Goldhoff v Sorgi, Joao Pedro | 6-4,6-4 |
| ITF M15 Claremont | 2019/02/05 20:30 | George Goldhoff v Hamilton, Grey | 7-5,6-3 |
| ITF M15 Claremont | 2019/02/05 18:00 | Shabaz, Michael v George Goldhoff | 3-6,3-6 |
| Los Angeles, Singles M-ITF-USA-01A | 2019/01/03 20:10 | George Goldhoff v Redlicki, Martin | 2-6,4-6 |
| Los Angeles, Singles M-ITF-USA-01A | 2019/01/02 19:35 | George Goldhoff v Dougaz, Aziz | 7-6,4-6,7-6 |
| Los Angeles, Singles M-ITF-USA-01A | 2019/01/01 20:20 | Axel Nefve v George Goldhoff | 7-5,4-6,6-10 |
| Los Angeles, Singles M-ITF-USA-01A | 2018/12/31 18:00 | George Goldhoff v Lucas Renard | 6-3,7-5 |