Round: 54 Ground: Hardcourt outdoor
| ITF - M25 Toowoomba | 2019/10/05 23:30 | Glen Dawes v Zac Osborne | 6-1,6-4 |
| ITF - M25 Brisbane | 2019/09/29 00:00 | Matthew Dellavedova v Zac Osborne | 6-2,6-2 |
| ITF - M25 Darwin | 2019/09/22 00:30 | Zac Osborne v Nicholas Horton | 0-6,4-6 |
| ITF - M25 Cairns | 2019/09/15 00:00 | Nicholas Jovanovski v Zac Osborne | 7-6,6-1 |
| ITF - M15 Mornington | 2019/03/24 23:00 | Daisuke Sumizawa v Zac Osborne | 6-2,6-1 |
| ITF - Austrália F7 | 2018/09/29 03:45 | Zac Osborne v Masayoshi Ono | 4-6,3-6 |
| ITF - Austrália F7 | 2018/09/29 00:00 | Zac Osborne v John Hu | 7-6,6-1 |
| ITF - Austrália F6 | 2018/09/24 02:05 | Masayoshi Ono v Zac Osborne | 6-2,6-1 |