| UTR Pro Tennis Series Amsterdam | 2021/12/09 07:00 | Muller, Rik v Max Houkes | 1-6,3-6 |
| UTR Pro Tennis Series Amsterdam | 2021/11/06 10:30 | Admiraal, Amadatus v Muller, Rik | 7-6,5-2 |
| UTR Pro Tennis Series Amsterdam | 2021/11/05 09:00 | Edison Ambarzumjan v Muller, Rik | 2-6,6-2,0-5 |
| UTR Pro Tennis Series Amsterdam | 2021/11/04 10:30 | Ivan Denisov v Muller, Rik | 6-3,5-1 |
| UTR Pro Tennis Series Amsterdam | 2021/11/03 10:30 | Michiel de Krom v Muller, Rik | 6-4,5-1 |
| UTR Pro Tennis Series Amsterdam | 2021/11/01 09:00 | Deney Wassermann v Muller, Rik | 6-0,5-2 |
| UTR Pro Tennis Series Amsterdam | 2021/12/09 07:00 | Admiraal, Amadatus v van Baal, Aloys Johannes Willem | 6-4,6-6 |
| ITF M15 Oldenzaal | 2021/08/16 10:00 | Eisinga, Zachary v van Baal, Aloys Johannes Willem | 3-6,6-4,10-7 |
| ITF M15 Oldenzaal | 2021/08/15 08:30 | Verwater, Yannick v van Baal, Aloys Johannes Willem | 3-6,1-6 |
| ITF M25 The Hague | 2021/06/27 08:00 | van Baal, Aloys Johannes Willem v Raphael Collignon | 4-6,3-6 |
| ITF M15 Skopje | 2021/06/07 09:00 | Max Houkes v van Baal, Aloys Johannes Willem | 6-2,6-2 |
| ITF M15 Skopje | 2021/05/30 07:00 | van Baal, Aloys Johannes Willem v Tom Gentzsch | 1-6,7-5,7-10 |
| ITF - M15 Monastir | 2021/03/28 10:30 | van Baal, Aloys Johannes Willem v Pietro Pampanin | 4-6,2-6 |
| ITF M15 Cairo | 2020/11/29 10:30 | van Baal, Aloys Johannes Willem v Dzhavakian, Yurii | 6-2,4-6,5-10 |