Stadium: Court Valongo 1 Round: 44 Ground: Hardcourt outdoor
| ITF M15 Las Palmas | 2021/04/26 10:30 | Mark Owen Endler v Aaron Cohen | 4-6,4-6 |
| ITF M15 Las Palmas | 2021/04/25 11:00 | Gabriele Moghini v Mark Owen Endler | 5-7,6-3,9-11 |
| ITF M25 Meerbusch | 2021/04/13 09:30 | Mark Owen Endler v Niels Visker | 1-6,2-6 |
| ITF M25 Meerbusch | 2021/04/12 10:00 | Alessio Vasquez Gehrke v Mark Owen Endler | 6-7,3-6 |
| ITF M25 Meerbusch | 2021/04/11 12:30 | Mark Owen Endler v Julian Peter | 6-1,6-0 |
| Challenger Gran Canaria | 2021/02/23 10:00 | Alex Molcan v Mark Owen Endler | 6-0,6-1 |
| ITF M25 Villena | 2021/02/01 10:30 | Javier Molino v Mark Owen Endler | 6-4,5-7,10-6 |
| ITF M15 Manacor | 2021/01/10 12:30 | Mark Owen Endler v Andrew Paulson | 3-6,0-6 |
| ITF M25 Wroclaw | 2021/06/27 14:00 | Dominik Langmajer v Mateusz Terczynski | 1-6,3-6 |
| ITF M15 Gaiba | 2021/06/07 09:45 | Francesco Vilardo v Dominik Langmajer | 7-5,6-3 |
| ITF M15 Jerusalem | 2021/05/09 08:30 | Alexandros Skorilas v Dominik Langmajer | 6-2,6-0 |
| ITF M15 Sharm El Sheikh | 2021/03/21 13:00 | Dominik Langmajer v Kousuke Ogura | 3-6,2-6 |
| ITF M15 Sharm El Sheikh | 2021/03/14 07:00 | Dominik Langmajer v Emiliano Troche | 2-6,4-6 |
| ITF M15 Sharm El Sheikh | 2021/03/07 07:00 | Dominik Langmajer v Alexandros Skorilas | 3-6,1-6 |
| ITF M15 Sharm El Sheikh | 2020/11/01 09:30 | Dominik Langmajer v Simon Beaupain | 3-6,2-6 |
| ITF M15 Sharm El Sheikh | 2020/10/28 12:40 | Dominik Langmajer v Alexey Zakharov | 3-6,2-6 |