| UTR Pro Carrara | 2023/09/24 00:30 | Sam Ryan Ziegann v Sam Oster | 6-4,6-3 |
| UTR Pro Carrara | 2023/08/15 00:30 | Sam Ryan Ziegann v Sam Oster | 6-1,7-5 |
| UTR Pro Carrara | 2023/08/07 23:00 | Sam Oster v Sam Ryan Ziegann | 6-4,4-6,6-7 |
| UTR Pro Tennis Series Carrara | 2021/10/16 03:30 | Sam Ryan Ziegann v Sam Oster | 6-1,6-1 |
| UTR Pro Tennis Series Brisbane | 2021/07/29 00:30 | Sam Ryan Ziegann v Sam Oster | 1-3 |
| UTR Pro Craigieburn | 2024/04/09 00:00 | Sam Ryan Ziegann v Nathan Boniel | 4-6,6-7 |
| UTR Pro Craigieburn | 2024/04/08 00:30 | Sam Ryan Ziegann v Nicholas Jovanovski | 6-4,5-4 |
| ITF M25 Swan Hill | 2024/03/20 00:25 | Sam Ryan Ziegann v Pavle Marinkov | 0-6,3-6 |
| ITF M25 Swan Hill | 2024/03/19 00:50 | Sam Ryan Ziegann v Benjamin Loccisano | 6-2,6-3 |
| ITF M25 Swan Hill | 2024/03/18 01:30 | Sam Ryan Ziegann v Matthew Woerndle | 6-1,6-1 |
| ITF M25 Mildura | 2024/03/12 02:25 | Matt Hulme v Sam Ryan Ziegann | 7-5,6-3 |
| ITF M25 Traralgon | 2024/02/29 01:35 | Hiroki Moriya v Sam Ryan Ziegann | 3-6,7-6,6-1 |
| ITF M25 Traralgon | 2024/02/27 23:00 | Kousuke Ogura v Sam Ryan Ziegann | 3-6,3-6 |
| UTR Pro Craigieburn | 2024/04/09 00:00 | Nicholas Jovanovski v Sam Oster | 7-6,3-6,4-6 |
| ITF M25 Swan Hill | 2024/03/17 23:00 | Sam Oster v Thomas Patton | 5-7,5-7 |
| ITF M25 Mildura | 2024/03/13 02:00 | Jarrod Joyce v Sam Oster | 6-3,5-7,6-3 |
| ITF M25 Mildura | 2024/03/11 23:50 | Naoki Tajima v Sam Oster | 6-3,3-6,6-10 |
| ITF M25 Mildura | 2024/03/10 22:30 | Sam Oster v Benjamin Loccisano | 6-2,6-4 |
| ITF M25 Mildura | 2024/03/09 22:00 | Sam Oster v Nicholas Jovanovski | 6-2,6-1 |
| ITF M25 Traralgon | 2024/02/26 01:30 | Chase Ferguson v Sam Oster | 7-6,0-6,10-6 |
| ITF M25 Traralgon | 2024/02/25 01:30 | Moritz Schroeter v Sam Oster | 6-7,2-6 |