Stadium: Court 1 Round: 54 Ground: Clay
| ITF - M25 Trier | 2021/08/23 10:30 | Leopold Zima v Lennart Melzer | 6-1,6-1 |
| ITF - M25 Koksijde | 2021/08/15 11:40 | Lennart Melzer v Tom Clavel | 3-6,6-4,8-10 |
| ITF - M15 Esch/Alzette | 2021/07/18 09:45 | Lennart Melzer v Andreja Petrovic | 3-6,0-6 |
| ITF - M25 Bourg-en-Bresse | 2021/06/27 12:50 | Damien Wenger v Lennart Melzer | 6-1,6-0 |
| ITF - M25 La Nucia | 2021/03/14 08:00 | Jorge Martinez Martinez v Lennart Melzer | 6-0,6-1 |
| ITF - M15 La Nucia | 2021/03/08 11:00 | Lennart Melzer v Francisco Andreu Garcia | 2-6,1-6 |
| ITF - M15 - Antalya | 2021/02/28 11:00 | Lennart Melzer v Vito Dell'Elba | 3-6,2-6 |
| ITF - M15 Monastir | 2020/12/06 08:00 | Omni Kumar v Lennart Melzer | 6-0,6-0 |