Stadium: Court 19 Round: 54 Ground: Clay
| ITF - M25 Muttenz | 2021/08/18 14:50 | Yannik Steinegger v Calvin Hemery | 6-7,1-6 |
| ITF - M15 Vejle | 2021/07/28 14:35 | Yannik Steinegger v Mats Rosenkranz | 1-6,6-3,4-6 |
| ITF - M15 Vejle | 2021/07/26 14:40 | Yannik Steinegger v Leonardo Catani | 5-7,6-2,10-4 |
| ITF - M15 Vejle | 2021/07/25 11:00 | Yannik Steinegger v Johannes Ingildsen | 6-4,6-2 |
| ITF - M25 Marburg | 2021/07/07 08:45 | Yannik Steinegger v Sidane Pontjodikromo | 0-6,6-7 |
| ITF - M25 Marburg | 2021/07/06 12:30 | Andres Gabriel Ciurletti v Yannik Steinegger | 1-6,7-6,3-10 |
| ITF - M25 Marburg | 2021/07/05 10:25 | Liam Gavrielides v Yannik Steinegger | 6-1,3-6,9-11 |
| ITF - M25 Klosters | 2021/06/23 07:00 | Alexander Erler v Yannik Steinegger | 6-7,6-2,6-1 |
| 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 Novi Sad | 2021/07/27 09:05 | Alex Knaff v Bekkhan Atlangeriev | 4-6,2-6 |
| ITF - M15 Novi Sad | 2021/07/26 12:00 | Alex Knaff v Tomislav Jotovski | 5-7,6-2,11-9 |
| ITF - M15 Novi Sad | 2021/07/25 10:45 | Luka Pavlovic v Alex Knaff | 6-7,7-5,13-15 |