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