| ITF M15 Oldenzaal | 2019/08/15 15:20 | Eisinga, Zachary v Guy Den Heijer | 7-6,7-5 |
| UTR Pro Tennis Series Blaricum | 2022/04/07 09:30 | Guy Den Heijer v Ivan Denisov | 2-6,6-6 |
| UTR Pro Tennis Series Blaricum | 2022/04/05 09:30 | Guy Den Heijer v Kalinin, Aleksandr | 6-4,6-1 |
| UTR Pro Tennis Series Blaricum | 2022/04/04 12:00 | Guy Den Heijer v Timmermans, Jesse | 6-4,6-4 |
| UTR Pro Tennis Series Blaricum | 2022/04/03 08:00 | Oscar Galimardanov v Guy Den Heijer | 0-6,2-6 |
| ITF - M25 Quinta Do Lago | 2022/03/25 10:00 | Makoto Ochi v Guy Den Heijer | 6-4,6-1 |
| ITF - M25 Loulé | 2022/03/17 10:00 | Alexander Donski v Guy Den Heijer | 6-3,1-6,10-7 |
| ITF - M25 Loulé | 2022/03/16 16:00 | Maximo Nagele v Guy Den Heijer | 0-6,0-6 |
| ITF M25 Portimao | 2022/03/10 14:40 | Guy Den Heijer v Jonas Forejtek | 6-3,2-6,2-6 |
| UTR Pro Tennis Series Blaricum | 2022/04/06 12:30 | Eisinga, Zachary v Sidane Pontjodikromo | 7-6,6-0 |
| UTR Pro Tennis Series Blaricum | 2022/04/05 12:30 | Eisinga, Zachary v Koch, Niklas | 5-1 |
| UTR Pro Tennis Series Blaricum | 2022/04/04 08:00 | Eisinga, Zachary v Alen Moritz Hodzic | 6-4,6-3 |
| UTR Pro Tennis Series Blaricum | 2022/04/03 12:30 | Eisinga, Zachary v Twan Van Zijl | 7-6,6-4 |
| UTR Pro Tennis Series Amsterdam | 2022/03/06 10:30 | Jesse De Jager v Eisinga, Zachary | 6-1,4-6,5-0 |
| UTR Pro Tennis Series Amsterdam | 2022/03/05 13:30 | Miko Wassermann v Eisinga, Zachary | 1-6,0-6 |
| UTR Pro Tennis Series Amsterdam | 2022/03/04 12:00 | Bielinskyi, Oleksandr v Eisinga, Zachary | 4-6,3-5 |
| UTR Pro Tennis Series Amsterdam | 2022/03/03 12:00 | Rob Van Den Berg v Eisinga, Zachary | 7-6,3-6,6-7 |