Stadium: Court 2 Round: 29 Ground: Clay
| ITF - Antalya M15 | 2021/05/08 07:30 | Orlando Luz v Alexander Erler | 5-7,6-7 |
| ITF - Antalya M15 | 2021/05/07 07:00 | Alexander Erler v Nick Hardt | 7-6,6-0 |
| ITF - Antalya M15 | 2021/05/06 07:00 | Alexander Erler v Cheong-Eui Kim | 6-4,3-6,6-3 |
| ITF - Antalya M15 | 2021/05/05 08:25 | Alexander Erler v Vito Dell'Elba | 6-0,6-0 |
| ITF - Sibenik M15 | 2021/04/23 08:00 | Sebastian Prechtel v Alexander Erler | 6-4,6-4 |
| ITF - Sibenik M15 | 2021/04/22 10:15 | Marco Miceli v Alexander Erler | 1-6,4-6 |
| ITF - Sibenik M15 | 2021/04/21 13:20 | Gorazd Srbljak v Alexander Erler | 1-6,2-6 |
| ITF - Meerbusch M25 | 2021/04/18 11:30 | Alexander Erler v Arthur Cazaux | 6-2,4-6,7-5 |
| ITF - Antalya M15 | 2021/05/08 07:30 | Sandro Ehrat v Adrian Andreev | 1-6,7-5,3-6 |
| ITF - Antalya M15 | 2021/05/07 08:35 | Sandro Kopp v Adrian Andreev | 3-6,4-6 |
| ITF - Antalya M15 | 2021/05/06 11:40 | Gabriele Piraino v Adrian Andreev | 3-6,2-6 |
| ITF - Antalya M15 | 2021/05/05 11:40 | Louroi Martinez v Adrian Andreev | 5-7,6-7 |
| Challenger Oeiras | 2021/04/08 10:00 | Pedro Cachin v Adrian Andreev | 6-2,6-4 |
| Challenger Oeiras | 2021/04/06 12:00 | Chun Hsin Tseng v Adrian Andreev | 6-1,6-7,3-6 |
| Challenger Oeiras - Kwalifikacje | 2021/04/04 11:30 | Eduard Esteve Lobato v Adrian Andreev | 3-6,4-6 |
| ITF - Biel M25 | 2021/03/30 13:50 | Adrian Andreev v Tim Van Rijthoven | 3-6,1-6 |