| 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 Carrara | 2023/08/07 00:30 | Thomas Hann v Sam Oster | 6-0,7-5 |
| ITF M15 Caloundra | 2023/08/02 03:20 | Tai Leonard Sach v Sam Oster | 6-1,6-3 |
| ITF M15 Caloundra | 2023/08/01 01:45 | James Watt v Sam Oster | 6-7,6-2,7-10 |
| ITF M15 Caloundra | 2023/07/31 00:00 | Sam Oster v Seungmin Park | 6-2,6-2 |
| ITF M15 Caloundra | 2023/07/30 00:00 | Thomas Nicholas Gadecki v Sam Oster | 4-6,4-6 |
| ITF M15 Caloundra | 2023/07/25 02:05 | Callum Gale v Sam Oster | 5-7,7-5,10-3 |
| ITF M15 Caloundra | 2023/07/24 06:30 | Sam Oster v Lawrence Bataljin | 5-7,6-3,10-8 |
| ITF M15 Caloundra | 2023/07/23 01:00 | William Jesser v Sam Oster | 3-6,1-6 |
| ITF M15 Caloundra | 2023/08/01 01:30 | Arjun Mehrotra v Sam Ryan Ziegann | 6-2,6-3 |
| ITF M15 Caloundra | 2023/07/31 00:00 | William Jesser v Sam Ryan Ziegann | 0-6,6-7 |
| ITF M15 Caloundra | 2023/07/24 08:00 | Sam Ryan Ziegann v Anton Shepp | 3-6,7-6,4-10 |
| ITF M25 Nakhon Si Thammarat | 2023/06/11 08:30 | James Van Herzeele v Sam Ryan Ziegann | 6-7,6-3,10-8 |
| ITF M15 Nakhon Si Thammarat Qual | 2023/06/04 02:00 | Julien De Cuyper v Sam Ryan Ziegann | 6-1,7-6 |
| ITF M15 Nakhon Si Thammarat | 2023/05/29 04:00 | Sam Ryan Ziegann v Arjun Mahadevan | 6-3,3-6,11-13 |
| Challenger Burnie | 2023/01/29 02:45 | Edward Winter v Sam Ryan Ziegann | 6-1,6-4 |
| ITF M15 Jakarta Qual | 2023/01/23 02:30 | Ishaque Eqbal v Sam Ryan Ziegann | 6-1,6-0 |