Stadium: Court 3 Round: 14 Ground: Clay
| ITF M25 Grodzisk Mazowiecki | 2021/08/05 14:40 | Facundo Diaz Acosta v Maciej Rajski | 6-4,1-6,4-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/03 10:30 | Facundo Diaz Acosta v Wojcik, Yann | 6-3,7-6 |
| ITF M25 Denia | 2021/07/28 14:00 | Facundo Diaz Acosta v Gonzalez, Alejandro | 4-6,7-6,3-6 |
| Challenger Todi | 2021/07/12 18:30 | Pedro Cachin v Facundo Diaz Acosta | 6-3,6-4 |
| Braunchsweig, Germany | 2021/07/04 11:10 | Mats Rosenkranz v Facundo Diaz Acosta | 3-6,7-6,7-6 |
| ITF M25 Most | 2021/05/29 08:30 | Facundo Diaz Acosta v Franco Agamenone | 4-6,3-6 |
| ITF M25 Most | 2021/05/27 10:25 | Antoine Escoffier v Facundo Diaz Acosta | 7-5,3-6,3-6 |
| ITF M25 Most | 2021/05/25 11:50 | Jiri Krouzek v Facundo Diaz Acosta | 4-6,3-6 |
| Umag, Croatia | 2021/07/19 14:30 | Daniel Altmaier v Matija Pecotic | 3-6,6-4,6-3 |
| Umag, Croatia | 2021/07/18 16:15 | Matija Pecotic v Fabbiano, Thomas | 7-5,6-2 |
| Iasi, Romania | 2021/07/15 09:00 | Hugo Gaston v Matija Pecotic | 4-6,6-4,7-6 |
| Iasi, Romania | 2021/07/13 10:50 | Matija Pecotic v Ortega-Olmedo, Roberto | 4-6,6-0,6-1 |
| UTR Pro Tennis Series Zadar | 2021/07/04 10:00 | Matija Pecotic v Zmak, Deni | 6-3,6-3 |
| UTR Pro Tennis Series Zadar | 2021/07/03 07:00 | Matija Pecotic v Roko Horvat | 6-3,5-4 |
| UTR Pro Tennis Series Zadar | 2021/07/02 09:30 | Kiefer, Alexander v Matija Pecotic | 1-6,0-6 |
| UTR Pro Tennis Series Zadar | 2021/07/01 11:00 | Kajin, Karlo v Matija Pecotic | 1-6,2-5 |