Stadium: Court 12 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Falun | 2021/09/28 14:30 | Otto Virtanen v Patrik Niklas-Salminen | 6-1,7-6 |
| ITF M25 Jonkoping | 2021/09/21 07:30 | Daniel Little v Patrik Niklas-Salminen | 6-4,7-6 |
| Davis Cup | 2021/09/18 12:55 | Patrik Niklas-Salminen v Prajnesh Gunneswaran | 3-6,5-7 |
| Challenger Warsaw | 2021/08/22 09:00 | Christopher Heyman v Patrik Niklas-Salminen | 6-1,6-3 |
| ITF M15 Bratislava | 2021/08/17 13:40 | Matvey Minin v Patrik Niklas-Salminen | 6-1,7-6 |
| ITF M15 Gdynia | 2021/08/10 14:10 | Alexis Musialek v Patrik Niklas-Salminen | 6-4,6-3 |
| ITF M15 Parnu | 2021/08/04 08:30 | Patrik Niklas-Salminen v Yan Sabanin | 3-6,6-7 |
| Challenger Tampere | 2021/07/19 16:05 | Patrik Niklas-Salminen v Alexandre Muller | 2-6,1-6 |
| ITF M15 Cairo | 2021/09/26 13:30 | Astur Martinez Irigoyen v Muthu A Senthilkumar | 6-4,6-2 |
| ITF M15 Cairo | 2021/09/22 10:30 | Zachary Eisinga v Muthu A Senthilkumar | 5-7,6-3,6-1 |
| ITF M15 Cairo | 2021/09/14 08:15 | Gabriel Ciro Da Silva v Muthu A Senthilkumar | 6-2,7-5 |
| ITF M15 Cairo | 2021/09/13 08:00 | Louis Allen v Muthu A Senthilkumar | 4-6,7-5,8-10 |
| ITF M15 Cairo | 2021/09/12 12:30 | Antonio Mazzeo v Muthu A Senthilkumar | 5-7,6-3,7-10 |
| ITF M15 New Delhi | 2021/03/31 10:30 | Muthu A Senthilkumar v Zsombor Velcz | 4-6,1-6 |
| ITF M15 New Delhi | 2021/03/30 05:30 | Faisal Qamar v Muthu A Senthilkumar | 1-6,3-6 |
| ITF M15 New Delhi | 2021/03/28 12:15 | Yash Chaurasia v Muthu A Senthilkumar | 3-6,4-6 |