Stadium: Court 2 Round: 14 Ground: Clay
| ITF M25 Lesa | 2021/08/25 19:00 | Marcello Serafini v Balzerani, Riccardo | 4-6,3-6 |
| ITF M15 Pescara | 2021/08/19 10:45 | Marcello Serafini v Giorgio Tabacco | 4-6,6-7 |
| ITF M15 Pescara | 2021/08/17 08:00 | Basso, Andrea v Marcello Serafini | 2-6,6-4,1-6 |
| ITF M15 Novi Sad | 2021/08/02 12:30 | Marcello Serafini v Morris, Eric | 4-6,4-6 |
| ITF M15 Perugia | 2021/07/24 17:00 | Luca Nardi v Marcello Serafini | 6-3,6-4 |
| ITF M15 Perugia | 2021/07/23 12:30 | Lipovsek Puches, Tomas v Marcello Serafini | 4-6,1-6 |
| ITF M15 Perugia | 2021/07/22 11:45 | Marcello Serafini v Galarza, Juan Ignacio | 6-3,7-5 |
| ITF M15 Perugia | 2021/07/21 15:15 | Marcello Serafini v Moroni, Filippo | 6-4,6-2 |
| Challenger Warsaw | 2021/08/25 12:40 | Nicolas Kicker v Erler, Alexander | 2-6,7-5,6-3 |
| Kitzbuhel, Austria | 2021/07/28 14:50 | Ymer, Mikael v Erler, Alexander | 6-2,6-3 |
| Kitzbuhel, Austria | 2021/07/27 15:00 | Erler, Alexander v Alcaraz Garfia, Carlos | 7-5,1-6,6-2 |
| Challenger Tampere | 2021/07/21 09:00 | Geoffrey Blancaneaux v Erler, Alexander | 6-3,4-6,6-2 |
| Challenger Tampere | 2021/07/20 10:30 | Gastao Elias v Erler, Alexander | 4-6,6-3,5-7 |
| Challenger Tampere | 2021/07/19 12:25 | Erler, Alexander v Bogdan Bobrov | 6-4,5-7,1-6 |
| Challenger Tampere | 2021/07/18 09:45 | Erler, Alexander v Eero Vasa | 6-2,3-6,6-2 |
| Challenger Salzburg | 2021/07/06 10:10 | Alexey Vatutin v Erler, Alexander | 2-6,6-4,6-2 |