| UTR Pro Tennis Series Miami | 2021/11/02 15:30 | Mark Wallner v George Botezan | 6-3,0-0 |
| UTR Pro Tennis Series Miami | 2021/11/01 15:00 | Wyatt DeMulling v Mark Wallner | 2-6,1-5 |
| UTR Pro Tennis Series Mulheim | 2021/07/31 10:00 | Mark Wallner v Hendrik Jebens | 1-6,4-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/30 12:33 | Mark Wallner v Stefan Peter Hampe | 6-3,5-1 |
| UTR Pro Tennis Series Mulheim | 2021/07/29 13:30 | Mark Wallner v Guy Den Heijer | 2-6,3-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/28 11:00 | Mark Wallner v Tim Sandkaulen | 6-7,5-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/27 09:30 | Mark Wallner v Matthew Thomson | 7-6,7-6 |
| UTR Pro Tennis Series Mulheim | 2021/07/26 11:00 | Billy Harris v Mark Wallner | 7-6,7-6 |
| UTR Pro Tennis Series Miami | 2021/11/01 18:00 | Bruno Caula v Kian Vakili | 7-6,0-6,5-1 |
| UTR Pro Tennis Series Florida | 2021/08/25 13:00 | Kian Vakili v Jorge Panta | 2-6,4-6 |
| UTR Pro Tennis Series Florida | 2021/08/24 15:00 | Kian Vakili v Mateo Barreiros Reyes | 6-7,7-5,3-6 |
| UTR Pro Tennis Series Florida | 2021/08/23 12:00 | Kian Vakili v Parth Aggarwal | 6-4,5-3 |