Stadium: Court 1 Round: 62 Ground: Clay
| ITF M25 Marburg | 2021/07/07 09:00 | Maik Steiner v Arnaud Bovy | 6-3,6-7,6-7 |
| ITF M25 Marburg | 2021/07/06 12:30 | Christoph Negritu v Maik Steiner | 7-6,5-7,8-10 |
| ITF M25 Marburg | 2021/07/05 10:05 | Lawrence Bataljin v Maik Steiner | 4-6,3-6 |
| ITF M25 Bourg-en-Bresse | 2021/06/30 07:00 | Maik Steiner v Clement Tabur | 4-6,2-6 |
| ITF M25 Bourg-en-Bresse | 2021/06/28 09:00 | Yann Marti v Maik Steiner | 6-3,2-6,9-11 |
| ITF M25 Bourg-en-Bresse | 2021/06/27 09:40 | Theo Arribage v Maik Steiner | 2-6,6-2,8-10 |
| ITF M25 Klosters | 2021/06/20 07:00 | Gian Luca Tanner v Maik Steiner | 6-4,6-2 |
| ITF M15 Antalya | 2021/06/02 11:30 | Maik Steiner v Giacomo Dambrosi | 3-6,3-6 |