Stadium: Court 4 Round: 25 Ground: Clay
| ITF - M15 L'Aquila | 2021/07/15 07:00 | Luciano Darderi v Sebastian Prechtel | 6-7,6-3,6-2 |
| ITF - M15 L'Aquila | 2021/07/14 08:00 | Sebastian Prechtel v Alessandro Procopio | 6-2,6-4 |
| ITF - M25 Velenje | 2021/07/08 08:00 | Sebastian Prechtel v Gonzalo Lama | 4-6,1-6 |
| ITF - M25 Velenje | 2021/07/07 10:45 | Sebastian Prechtel v Nemanja Malesevic | 6-3,6-3 |
| ITF - M15 Sarajevo | 2021/06/02 09:00 | Duje Kekez v Sebastian Prechtel | 6-1,6-1 |
| ITF - M25 Kiseljak | 2021/05/27 12:00 | Zsombor Piros v Sebastian Prechtel | 6-3,6-4 |
| ITF - M25 Kiseljak | 2021/05/25 13:05 | Sebastian Prechtel v Duje Kekez | 3-6,6-3,6-4 |
| ITF - M15 Šibenik | 2021/05/20 08:00 | Zsombor Piros v Sebastian Prechtel | 6-1,6-1 |
| ITF - M15 Esch/Alzette | 2021/07/20 13:00 | Jeffrey Von Der Schulenburg v Guy Den Ouden | 6-4,3-6,7-5 |
| Challenger - Amersfoort | 2021/07/11 14:00 | Guy Den Ouden v Diego Hidalgo | 3-6,6-7 |
| ITF - M25 Marburg | 2021/07/05 12:05 | Yan Sabanin v Guy Den Ouden | 7-6,6-4 |
| ITF - M25 Haag | 2021/06/28 10:15 | Guy Den Ouden v Henri Squire | 2-6,0-6 |
| ITF - M25 Alkmaar | 2021/06/23 10:35 | Deney Wassermann v Guy Den Ouden | 7-6,7-5 |
| ITF - M15 Sharm El Sheikh | 2020/11/19 10:10 | Guy Den Ouden v Miljan Zekic | 6-7,6-7 |
| ITF - M15 Sharm El Sheikh | 2020/11/18 12:45 | Juan Bautista Otegui v Guy Den Ouden | 6-1,3-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2020/11/11 08:00 | Guy Den Ouden v Jeffrey Von Der Schulenburg | 2-6,5-7 |