Stadium: Court 6 Round: 25 Ground: Hardcourt outdoor
| 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 |
| ITF M15 Novi Sad | 2021/08/01 14:00 | Alex Knaff v Admir Kalender | 7-5,6-4 |
| ITF M15 Monastir | 2021/08/27 09:30 | Felix Corwin v Robin Bertrand | 4-6,4-6 |
| ITF M15 Monastir | 2021/08/26 14:30 | Felix Corwin v Terence Atmane | 2-6,6-4,7-6 |
| ITF M15 Monastir | 2021/08/25 09:00 | Felix Corwin v Omni Kumar | 6-7,6-4,6-1 |
| ITF M15 Monastir | 2021/08/18 07:30 | Felix Corwin v Luciano Darderi | 4-6,3-6 |
| ITF M25 Decatur | 2021/08/04 13:50 | Shintaro Imai v Felix Corwin | 6-1,6-2 |
| ITF M25 Champaign | 2021/07/29 17:00 | Yu Hsiou Hsu v Felix Corwin | 7-6,6-4 |
| ITF M25 Champaign | 2021/07/28 15:00 | Felix Corwin v Eliot Spizzirri | 7-5,7-6 |
| ITF M15 Edwardsville | 2021/07/22 16:00 | Cannon Kingsley v Felix Corwin | 6-2,6-2 |