Stadion: Court 1 Round: 26 Ground: Hardcourt outdoor
| ITF - M15 - Doha | 2019/10/23 13:50 | Mikalai Haliak v Guy Den Heijer | 6-7,6-2,2-6 |
| ITF - M15 - Doha | 2019/10/16 12:00 | Guy Den Heijer v Antoine Bellier | 1-6,3-6 |
| ITF - M15 - Antalya | 2019/09/27 07:30 | Paul Woerner v Guy Den Heijer | 6-2,6-1 |
| ITF - M15 - Antalya | 2019/09/24 07:00 | Guy Den Heijer v Alejandro H Franco | 7-6,6-0 |
| ITF - M15 - Haren | 2019/08/29 13:10 | Guy Den Heijer v Ryan Nijboer | 3-6,3-6 |
| ITF - M15 - Haren | 2019/08/28 10:20 | Alec Adamson v Guy Den Heijer | 2-6,2-6 |
| ITF - M15 - Oldenzaal | 2019/08/15 15:20 | Zachary Eisinga v Guy Den Heijer | 7-6,7-5 |
| ITF - M15 - Oldenzaal | 2019/08/14 17:20 | Jannik Rother v Guy Den Heijer | 7-5,3-6,4-6 |
| ITF - M15 - Doha | 2019/10/23 16:30 | Gustav Gustav Hansson v Ricardo Rodriguez-Pace | 7-5,6-4 |
| ITF - M15 - Doha | 2019/10/16 12:00 | Marat Deviatiarov v Gustav Gustav Hansson | 6-3,5-7,7-5 |
| ITF - M15 - Antalya | 2019/10/10 07:00 | Peter Heller v Gustav Gustav Hansson | 6-4,6-3 |
| ITF - M15 - Antalya | 2019/10/09 08:35 | Mariano Alberto Hasenkopf v Gustav Gustav Hansson | 3-6,6-3,3-6 |
| ITF - M25 - Falun | 2019/09/30 12:00 | Jesper De Jong v Gustav Gustav Hansson | 7-6,6-0 |
| ITF - M25 - Stockholm | 2019/09/27 11:15 | Evgeny Tyurnev v Gustav Gustav Hansson | 6-3,7-5 |
| ITF - M25 - Stockholm | 2019/09/26 13:50 | Gustav Gustav Hansson v Christopher Heyman | 7-6,6-4 |
| ITF - M25 - Stockholm | 2019/09/25 10:45 | Aldin Setkic v Gustav Gustav Hansson | 4-6,6-7 |