Stadium: Court 4 Round: 54 Ground: Clay
| ITF M25 Klosters | 2021/06/21 07:00 | Patrick Zahraj v Zimmermann, Ilias | 6-4,6-4 |
| ITF M25 Klosters | 2021/06/20 08:55 | Zimmermann, Ilias v Niklas Schell | 6-4,4-6,12-10 |
| ITF M25 Biel | 2021/03/29 10:55 | Vanni, Luca v Zimmermann, Ilias | 6-2,6-0 |
| ITF M25 Klosters | 2020/09/15 07:00 | Federico Arnaboldi v Zimmermann, Ilias | 6-3,6-2 |
| ITF M25 Klosters | 2020/09/14 10:00 | Hoeijmans, Luc v Zimmermann, Ilias | 2-6,5-7 |
| Swiss Tennis Masters | 2020/07/03 08:30 | Zimmermann, Ilias v Staeheli, Luca | 6-2,2-6,3-6 |
| Swiss Tennis Masters | 2020/07/02 13:00 | Zimmermann, Ilias v Louroi Martinez | 2-6,4-6 |
| ITF - M15 Héraklion | 2020/02/11 09:30 | Mattia Bellucci v Zimmermann, Ilias | 6-3,6-4 |