Stadium: TC Pau 1 Round: 26 Ground: Hardcourt indoor
| Challenger Buenos Aires | 2021/10/19 15:40 | Juan Pablo Ficovich v Nikolas Sanchez Izquierdo | 7-6,7-6 |
| Challenger Barcelona | 2021/10/05 13:35 | Nikolas Sanchez Izquierdo v Teymuraz Gabashvili | 5-7,2-6 |
| Challenger Murcia | 2021/09/28 10:50 | Nikolas Sanchez Izquierdo v Tallon Griekspoor | 3-6,1-6 |
| Challenger Braga | 2021/09/25 13:30 | Nikola Milojevic v Nikolas Sanchez Izquierdo | 6-2,6-4 |
| Challenger Braga | 2021/09/25 10:00 | Nikolas Sanchez Izquierdo v Taro Daniel | 6-3,6-2 |
| Challenger Braga | 2021/09/23 09:00 | Nikolas Sanchez Izquierdo v Andrea Collarini | 7-5,6-2 |
| Challenger Braga | 2021/09/20 09:00 | Nikolas Sanchez Izquierdo v Sebastian Fanselow | 6-4,1-6,6-3 |
| Challenger Braga | 2021/09/19 11:50 | Nikolas Sanchez Izquierdo v Henrique Rocha | 6-2,7-5 |
| Challenger Szczecin | 2021/09/12 09:00 | Jesper De Jong v Piotr Matuszewski | 6-3,6-4 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 16:00 | Piotr Matuszewski v Dawid Taczala | 1-6,6-4,7-10 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 11:05 | Piotr Matuszewski v Simon Sedliak | 2-6,6-4,10-4 |
| Polish National Tour | 2021/07/13 10:35 | Piotr Matuszewski v Wojciech Marek | 6-4,6-3 |
| ITF M25 Casinalbo | 2021/07/05 07:30 | Piotr Matuszewski v Gabriel Roveri Sidney | 6-2,4-6,6-10 |
| ITF M25 Casinalbo | 2021/07/04 08:45 | Piotr Matuszewski v Lorenzo Favero | 6-4,6-4 |
| ITF M25 Most | 2021/05/25 08:00 | Piotr Matuszewski v Hasan Ibrahim | 6-2,2-6,9-11 |
| ITF M25 Most | 2021/05/24 08:00 | Piotr Matuszewski v Theo Arribage | 7-5,7-5 |