Stadium: S+S Court Round: 54 Ground: Clay
| ITF - M25 Marburg | 2021/07/05 10:35 | Christoph Negritu v Dax Donders | 7-6,7-6 |
| Challenger - Heilbronn | 2021/05/09 11:55 | Christoph Negritu v Aleksandar Vukic | 5-7,2-6 |
| ITF - M15 Monastir | 2021/04/25 08:30 | Igor Marcondes v Christoph Negritu | 2-6,2-6 |
| ITF - M15 Monastir | 2021/04/24 09:30 | Omar Giacalone v Christoph Negritu | 4-6,2-6 |
| ITF - M15 Monastir | 2021/04/22 10:35 | Christoph Negritu v Christian Langmo | 7-5,7-6 |
| ITF - M15 Monastir | 2021/04/20 11:15 | Danylo Kalenichenko v Christoph Negritu | 2-6,4-6 |
| ITF - M15 Monastir | 2021/04/14 12:05 | Christoph Negritu v Savva Polukhin | 5-7,4-6 |
| ITF - M15 Monastir | 2021/04/10 08:30 | Franco Agamenone v Christoph Negritu | 6-1,6-3 |
| 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 |
| ITF - M15 - Antalya | 2021/06/01 07:00 | Maik Steiner v Francisco Llanes | 7-5,6-4 |
| ITF - M15 - Antalya | 2021/05/31 09:30 | Maik Steiner v Federico Marchetti | 6-1,7-6 |