Stadium: Court 1 Round: 25 Ground: Clay
| ITF M25 Alkmaar | 2021/06/21 14:25 | Guillaume Dermiens v Zachary Eisinga | 4-6,7-5,13-11 |
| ITF M25 Alkmaar | 2021/06/20 12:30 | Lodewijk Weststrate v Zachary Eisinga | 2-6,1-6 |
| ITF M15 Cairo | 2021/05/04 08:00 | Zachary Eisinga v Martin Dimitrov | 1-6,6-7 |
| ITF M15 Cairo | 2021/05/03 08:00 | Zachary Eisinga v Ali Alshati | 3-6,6-0,10-8 |
| ITF M15 Cairo | 2021/04/28 10:00 | Zachary Eisinga v Shintaro Mochizuki | 4-6,2-6 |
| ITF M15 Cairo | 2021/04/19 10:30 | Zachary Eisinga v Fares Zakaria | 2-6,6-3,3-10 |
| ITF M15 Cairo | 2021/04/18 07:00 | Zachary Eisinga v Anton Magnusson | 6-2,4-6,10-2 |
| ITF M15 Alkmaar | 2020/08/24 08:30 | Raphael Collignon v Zachary Eisinga | 6-4,6-3 |
| ITF M15 Bergamo | 2021/06/24 08:00 | Marvin Netuschil v Daniele Capecchi | 6-1,6-0 |
| ITF M15 Bergamo | 2021/06/23 09:00 | Andrea Basso v Marvin Netuschil | 6-1,2-6,2-6 |
| ITF M15 Troisdorf | 2021/05/13 13:25 | Marvin Netuschil v Sebastian Fanselow | 2-6,1-6 |
| ITF M15 Troisdorf | 2021/05/12 13:30 | Marvin Netuschil v Amaury Raynel | 6-1,6-3 |
| ITF M15 LPD Gran Canaria | 2021/04/28 09:55 | Johan Nikles v Marvin Netuschil | 6-3,6-2 |
| ITF M25 Meerbusch | 2021/04/14 10:30 | Alexander Erler v Marvin Netuschil | 6-3,6-2 |
| ITF M25 Meerbusch | 2021/04/13 11:30 | Marvin Netuschil v Mats Hermans | 6-4,6-1 |
| ITF M25 Meerbusch | 2021/04/12 13:00 | Marvin Netuschil v Patric Prinoth | 6-1,6-1 |