Stadium: Center court Round: 25 Ground: Clay
| ITF M15 Ulcinj | 2021/09/14 08:00 | Felix Gill v Matthew Romios | 6-3,3-6,6-4 |
| ITF M15 Allershausen | 2021/09/02 09:00 | Manish Sureshkumar v Matthew Romios | 6-1,5-7,6-3 |
| ITF M15 Allershausen | 2021/09/01 09:00 | Aliaksandr Bulitski v Matthew Romios | 4-6,6-7 |
| ITF M25 Trier | 2021/08/24 10:00 | Matthew Romios v Mick Veldheer | 1-6,0-6 |
| ITF M25 Ueberlingen | 2021/08/17 12:55 | Tim Handel v Matthew Romios | 6-4,6-2 |
| ITF M25 Frankfurt am Main | 2021/08/12 11:15 | Matthew Romios v Lucas Gerch | 6-7,1-6 |
| ITF M25 Frankfurt am Main | 2021/08/11 09:00 | Roberto Ortega-Olmedo v Matthew Romios | 2-6,4-6 |
| ITF M25 Frankfurt am Main | 2021/08/10 08:30 | Matthew Romios v Yan Sabanin | 5-7,4-6 |
| UTR Pro Tennis Series Canberra | 2021/04/23 03:00 | Nikita Volonski v Scott Puodziunas | 1-6,4-6 |
| UTR Pro Tennis Series Canberra | 2021/04/21 00:00 | Nikita Volonski v Omar Jasika | 4-6,4-6 |
| UTR Pro Tennis Series Canberra | 2021/04/19 23:30 | Nikita Volonski v Dayne Kelly | 1-6,2-6 |
| UTR Pro Tennis Series Canberra | 2021/04/18 23:30 | Casey Hoole v Nikita Volonski | 7-5,5-3 |
| UTR Pro Tennis Series Canberra | 2021/04/18 02:00 | Nikita Volonski v Scott Webster | 6-4,6-1 |
| UTR Pro Tennis Series Canberra | 2021/04/17 03:00 | Aaron Addison v Nikita Volonski | 6-2,3-6,1-5 |
| UTR Pro Tennis Series Canberra | 2021/04/15 23:00 | Nikita Volonski v Li Tu | 2-6,3-5 |
| UTR Pro Tennis Series Canberra | 2021/04/14 05:00 | Nikita Volonski v Omar Jasika | 3-6,6-4,3-6 |