Stadium: Court 7 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 Monastir | 2021/08/30 11:00 | Kawahashi, Yuta v Alessandro Coccioli | 6-0,6-2 |
| ITF - M15 Monastir | 2021/08/29 10:30 | Kawahashi, Yuta v Imran D Abd Hazli | 6-1,6-3 |
| ITF - M15 Monastir | 2021/08/26 07:30 | Kawahashi, Yuta v Ezekiel Clark | 3-6,1-6 |
| ITF - M15 Monastir | 2021/08/25 08:55 | Naoki Tajima v Kawahashi, Yuta | 3-6,4-6 |
| ITF - M15 Monastir | 2021/08/24 07:30 | Kawahashi, Yuta v Fabrizio Andaloro | 6-4,6-1 |
| ITF - M15 Monastir | 2021/08/22 08:30 | Kawahashi, Yuta v Credit Chaiyarin | 6-2,6-3 |
| ITF - M15 Monastir | 2021/08/18 07:30 | Kawahashi, Yuta v Seelig, Kyle | 6-1,4-6,6-7 |
| ITF - M15 Monastir | 2021/08/17 07:30 | Kawahashi, Yuta v Adil Kalyanpur | 6-1,6-1 |
| 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 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 |