Stadium: Court 7 Round: 26 Ground: Clay
| Challenger Praha | 2021/08/08 12:00 | Facundo Diaz Acosta v Matija Pecotic | 7-6,6-1 |
| Challenger Praha | 2021/08/23 12:15 | Evgeny Tyurnev v Matija Pecotic | 6-7,2-6 |
| Challenger Verona | 2021/08/17 19:00 | Holger Rune v Matija Pecotic | 6-2,7-6 |
| Challenger Verona | 2021/08/16 09:00 | Flavio Cobolli v Matija Pecotic | 3-6,4-6 |
| Challenger Verona | 2021/08/15 13:35 | Nicolo Pozzani v Matija Pecotic | 2-6,4-6 |
| Challenger Praha | 2021/08/08 12:00 | Facundo Diaz Acosta v Matija Pecotic | 7-6,6-1 |
| ATP Umag | 2021/07/19 14:30 | Daniel Altmaier v Matija Pecotic | 3-6,6-4,6-3 |
| ATP Umag | 2021/07/18 16:15 | Matija Pecotic v Thomas Fabbiano | 7-5,6-2 |
| Challenger Jasy | 2021/07/15 09:00 | Hugo Gaston v Matija Pecotic | 4-6,6-4,7-6 |
| Challenger Praha | 2021/08/24 10:25 | Facundo Diaz Acosta v Matteo Donati | 6-1,6-3 |
| Challenger Praha | 2021/08/23 11:00 | Tiago Cacao v Facundo Diaz Acosta | 4-6,0-6 |
| Challenger Praha | 2021/08/22 12:00 | Alexander Donski v Facundo Diaz Acosta | 6-4,2-6,5-7 |
| ITF M25 Prostějov | 2021/08/21 07:50 | Facundo Diaz Acosta v Nikolas Sanchez Izquierdo | 4-6,6-1,4-6 |
| ITF M25 Prostějov | 2021/08/20 10:00 | Facundo Diaz Acosta v Dalibor Svrcina | 6-3,6-3 |
| ITF M25 Prostějov | 2021/08/19 11:15 | Lucas Miedler v Facundo Diaz Acosta | 1-6,2-6 |
| ITF M25 Prostějov | 2021/08/18 09:45 | Jiri Jenicek v Facundo Diaz Acosta | 0-6,0-6 |
| ITF M25 Prostějov | 2021/08/17 10:30 | Victor Sklenka v Facundo Diaz Acosta | 0-6,0-6 |