Stadium: Court 4 Round: 62 Ground: Hardcourt outdoor
| ITF M25 Trier | 2021/08/23 14:45 | Yannik Steinegger v Alex Knaff | 6-3,6-1 |
| ITF M25 Trier | 2021/08/23 09:00 | Alex Knaff v Schifris, Jeremy | 6-3,7-6 |
| ITF M25 Koksijde | 2021/08/15 10:15 | Wojcik, Jakub v Alex Knaff | 6-3,4-6,10-8 |
| ITF M15 Novi Sad | 2021/08/03 08:00 | Alex Knaff v Roko Horvat | 4-6,6-1,6-10 |
| ITF M15 Novi Sad | 2021/08/02 12:30 | Rogic Hadzalic, Alen v Alex Knaff | 2-6,1-6 |
| ITF M15 Novi Sad | 2021/08/01 14:00 | Alex Knaff v Kalender, Admir | 7-5,6-4 |
| ITF M15 Novi Sad | 2021/07/27 09:05 | Alex Knaff v Atlangeriev, Bekkhan | 4-6,2-6 |
| ITF M15 Novi Sad | 2021/07/26 12:00 | Alex Knaff v Jotovski, Tomislav | 5-7,6-2,11-9 |
| ITF - M15 Monastir | 2021/08/30 08:00 | Egor Tsarapkin v Thanapet Chanta | 6-2,6-2 |