Stadium: Center Court Round: 25 Ground: Hardcourt outdoor
| Challenger - Iași | 2021/07/14 08:00 | Lucas Miedler v Adrian Andreev | 7-6,6-1 |
| Challenger - Iași | 2021/07/12 09:20 | Adrian Andreev v Alexandre Muller | 6-4,1-6,6-3 |
| Challenger Braunschweig | 2021/07/04 09:00 | Daniel Michalski v Adrian Andreev | 7-6,7-6 |
| ITF M25 - Tulsa | 2021/06/16 16:30 | Adrian Andreev v Gonzalo Villanueva | 6-2,3-6,4-6 |
| Challenger - Orlando | 2021/06/07 14:00 | Adrian Andreev v Stefan Kozlov | 6-4,4-6,4-6 |
| Challenger - Orlando | 2021/06/06 16:10 | Adrian Andreev v Gonzalo Villanueva | 3-6,6-3,7-6 |
| ITF - M25 Pensacola | 2021/05/23 17:00 | Nicolas Kicker v Adrian Andreev | 6-7,6-3,6-2 |
| ITF - M25 Pensacola | 2021/05/22 16:00 | Aidan Mchugh v Adrian Andreev | 4-6,3-6 |
| ITF M25 Pozoblanco | 2019/08/07 17:45 | Blas Ruiz Romero v Andres Artunedo Martinavarr | 0-6,1-6 |
| ITF Spain F22 | 2018/08/07 17:15 | Ivan Marrero Curbelo v Blas Ruiz Romero | 6-0,6-2 |