Round: 25 Ground: Clay
| ITF M25 Guayaquil | 2021/08/03 17:10 | Antonio Cayetano March v Pol Martin Tiffon | 1-6,5-7 |
| ITF M25 Portoviejo | 2021/07/29 14:25 | Antonio Cayetano March v Juan A H Serrano | 6-3,7-6 |
| ITF M25 Portoviejo | 2021/07/27 17:50 | Antonio Cayetano March v Bautista Vilicich | 6-3,6-3 |
| ITF M15 Monastir | 2021/07/13 11:20 | Antonio Cayetano March v Samuel Vincent Ruggeri | 6-7,6-4,1-6 |
| ITF M15 Monastir | 2021/07/09 08:30 | Antonio Cayetano March v Omni Kumar | 5-7,2-6 |
| ITF M15 Monastir | 2021/07/08 08:30 | Perry Gregg v Antonio Cayetano March | 3-6,6-3,4-6 |
| ITF M15 Monastir | 2021/07/07 11:45 | Gabriele Maria Noce v Antonio Cayetano March | 6-7,7-5,2-6 |
| ITF M15 Monastir | 2021/06/30 08:30 | Robert Strombachs v Antonio Cayetano March | 6-3,7-5 |
| ITF M15 Oldenzaal | 2021/08/19 11:00 | Guy Den Ouden v Lorenzo Bocchi | 3-6,0-6 |
| ITF M15 Oldenzaal | 2021/08/18 15:35 | Mattia Bellucci v Guy Den Ouden | 3-6,3-6 |
| ITF M15 Frederiksberg | 2021/08/03 10:55 | Guy Den Ouden v Sandro Kopp | 4-6,4-6 |
| ITF M15 Vejle | 2021/07/30 14:30 | Jonathan Mridha v Guy Den Ouden | 6-3,6-4 |
| ITF M15 Vejle | 2021/07/29 16:30 | Guy Den Ouden v Mick Veldheer | 6-4,6-0 |
| ITF M15 Vejle | 2021/07/28 11:50 | Sebastian Prechtel v Guy Den Ouden | 2-6,2-6 |
| ITF M15 Esch/Alzette | 2021/07/20 13:00 | Jeffrey Von Der Schulenburg v Guy Den Ouden | 6-4,3-6,7-5 |
| Challenger Amersfoort | 2021/07/11 14:00 | Guy Den Ouden v Diego Hidalgo | 3-6,6-7 |