Stadium: Court 10 Round: 25 Ground: Clay
| UTR Pro Tennis Series Amsterdam | 2021/12/12 09:30 | Rik Muller v Zachary Eisinga | 3-6,3-6 |
| UTR Pro Tennis Series Amsterdam | 2021/12/11 07:00 | Max Van Nunen v Zachary Eisinga | 6-4,1-6,4-6 |
| UTR Pro Tennis Series Amsterdam | 2021/12/10 07:00 | Tim Sandkaulen v Zachary Eisinga | 6-1,6-7,7-5 |
| UTR Pro Tennis Series Amsterdam | 2021/12/09 08:30 | Tibo Colson v Zachary Eisinga | 6-2,6-3 |
| UTR Pro Tennis Series Amsterdam | 2021/12/07 07:00 | Sem Verbeek v Zachary Eisinga | 6-0,6-1 |
| UTR Pro Tennis Series Amsterdam | 2021/12/06 11:30 | Zachary Eisinga v Jurriaan Bol | 2-6,6-4,6-1 |
| ITF M15 Sharm El Sheikh | 2021/11/08 11:30 | Zachary Eisinga v Louis Allen | 5-7,7-5,8-10 |
| ITF M15 Sharm El Sheikh | 2021/11/07 17:00 | Zachary Eisinga v Danyil Chornous | 6-1,6-2 |
| Challenger Maia | 2021/12/14 13:25 | Edoardo Lavagno v Tiago Cacao | 6-1,2-6,7-6 |
| Challenger Maia | 2021/12/09 14:30 | Tiago Cacao v Gastao Elias | 2-6,6-2,3-6 |
| Challenger Maia | 2021/12/07 16:00 | Tiago Cacao v David Pichler | 2-6,6-1,6-4 |
| Challenger Antalya | 2021/12/01 07:00 | Duje Ajdukovic v Tiago Cacao | 6-2,6-1 |
| Challenger Antalya | 2021/11/30 07:55 | Tiago Cacao v Aleksandre Metreveli | 6-3,6-2 |
| Challenger Antalya | 2021/11/29 13:00 | Jakub Paul v Tiago Cacao | 1-6,4-6 |
| Challenger Antalya | 2021/11/29 08:55 | Tiago Cacao v Lucas Gerch | 6-1,3-6,6-2 |
| ITF M15 Antalya | 2021/11/24 06:30 | Tiago Cacao v Cezar Cretu | 5-7,3-6 |