Stadium: Court 3 Round: 54 Ground: Clay
| ITF M15 Allershausen | 2021/08/30 09:30 | William Ma v Julian Peter | 6-1,6-1 |
| ITF M25 Trier | 2021/08/23 11:30 | William Ma v Amaury Raynel | 4-6,2-6 |
| ITF M25 Ueberlingen | 2021/08/16 12:30 | William Ma v Jimmy Yang | 1-6,4-6 |
| ITF M25 Frankfurt am Main | 2021/08/09 10:35 | William Ma v Yan Sabanin | 3-6,3-6 |
| ITF M25 Wetzlar | 2021/08/02 14:35 | Benito Sanchez Martinez v William Ma | 6-3,1-6,11-9 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Benedikt Emesz v William Ma | 6-1,6-0 |
| UTR Pro Tennis Series Canberra | 2021/04/24 00:00 | Omar Jasika v William Ma | 6-3,5-2 |
| UTR Pro Tennis Series Canberra | 2021/04/21 01:30 | William Ma v Li Tu | 2-6,3-6 |
| ITF M25 Trier | 2021/08/23 10:30 | Joel Vincent Link v Patrick Zahraj | 1-6,3-6 |
| ITF M25 Wetzlar | 2021/08/02 10:10 | Joel Vincent Link v Dominik Recek | 0-6,4-6 |
| ITF M25 Kiseljak | 2021/05/23 10:45 | Lilian Breut v Joel Vincent Link | 6-0,6-1 |
| ITF M15 Brcko | 2021/05/16 11:00 | Andrej Nedic v Joel Vincent Link | 6-7,6-4,10-4 |
| ITF M15 Troisdorf | 2021/05/09 08:00 | Joel Vincent Link v Amaury Raynel | 3-6,1-6 |
| ITF M15 Antalya | 2021/04/25 07:00 | Denis Parshutin v Joel Vincent Link | 6-3,6-1 |
| ITF M15 Antalya | 2021/04/21 06:50 | Jeroen Vanneste v Joel Vincent Link | 6-3,6-4 |
| ITF M15 Antalya | 2021/04/12 07:00 | Luis Faria v Joel Vincent Link | 6-2,6-1 |