Stadium: Court 1 Round: 54 Ground: Clay
| ITF M25 Biel | 2021/03/29 10:55 | Luca Vanni v Ilias Zimmermann | 6-2,6-0 |
| ITF M25 Klosters | 2020/09/15 07:00 | Federico Arnaboldi v Ilias Zimmermann | 6-3,6-2 |
| ITF M25 Klosters | 2020/09/14 10:00 | Luc Hoeijmans v Ilias Zimmermann | 2-6,5-7 |
| Swiss Tennis Masters | 2020/07/03 08:30 | Ilias Zimmermann v Luca Staeheli | 6-2,2-6,3-6 |
| Swiss Tennis Masters | 2020/07/02 13:00 | Ilias Zimmermann v Louroi Martinez | 2-6,4-6 |
| ITF M15 Heraklion | 2020/02/11 09:30 | Mattia Bellucci v Ilias Zimmermann | 6-3,6-4 |
| ITF M15 Heraklion | 2020/02/10 09:30 | Ilias Zimmermann v Frane Nincevic | 7-6,6-2 |
| ITF M15 Horgen | 2019/08/28 09:30 | Ilias Zimmermann v Alejandro Gonzalez | 3-6,4-6 |
| ITF M15 Antalya | 2021/05/23 07:00 | Niklas Schell v Stefano D'Agostino | 4-6,6-3,7-10 |
| ITF M15 Troisdorf | 2021/05/09 08:00 | Marlon Vankan v Niklas Schell | 2-6,7-6,13-11 |
| ITF M15 Monastir | 2021/04/18 13:00 | Lilian Breut v Niklas Schell | 6-2,6-3 |
| ITF M15 Monastir | 2021/04/14 08:30 | Niklas Schell v Giorgio Ricca | 3-6,2-6 |
| ITF M15 Monastir | 2021/04/12 13:00 | Leyton Rivera v Niklas Schell | 4-6,7-6,8-10 |
| ITF M15 Monastir | 2021/04/11 11:00 | Viktor Jovic v Niklas Schell | 6-7,2-6 |
| ITF M25 Trimbach | 2021/03/10 11:45 | Elmar Ejupovic v Niklas Schell | 7-6,6-4 |
| ITF M25 Trimbach | 2021/03/09 12:00 | Niklas Schell v Johann Lars | 6-3,6-4 |