Stadium: Court 6 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Monastir | 2021/08/18 07:30 | Masamichi Imamura v Mattias Southcombe | 6-3,6-1 |
| ITF M15 Monastir | 2021/08/08 09:30 | Mattias Southcombe v Hamzeh Al-Aswad | 6-0,1-6,7-10 |
| ITF M15 Monastir | 2021/08/01 09:00 | Stefan Vujic v Mattias Southcombe | 7-5,2-6,10-7 |
| ITF M15 Monastir | 2021/09/01 11:05 | Alex Knaff v Felix Corwin | 7-5,6-7,3-6 |
| ITF M15 Monastir | 2021/08/31 08:00 | Yuta Kawahashi v Alex Knaff | 7-5,4-6,7-10 |
| ITF M15 Monastir | 2021/08/30 13:00 | Alex Knaff v Egor Tsarapkin | 6-3,6-3 |
| 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 Jeremy Schifris | 6-3,7-6 |
| ITF M25 Koksijde | 2021/08/15 10:15 | Jakub Wojcik 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 | Alen Rogic-Hadzalic v Alex Knaff | 2-6,1-6 |