Stadium: M (CC) Round: 62 Ground: Clay
| ITF M15 Oldenzaal | 2021/08/15 07:30 | Eisinga, Zachary v Peters, Flemming | 6-0,6-3 |
| ITF M25 The Hague | 2021/06/27 08:00 | Dax Donders v Eisinga, Zachary | 6-2,7-5 |
| ITF M25 Alkmaar | 2021/06/21 14:25 | Dermiens, Guillaume v Eisinga, Zachary | 4-6,7-5,13-11 |
| ITF M25 Alkmaar | 2021/06/20 12:30 | Lodewijk Weststrate v Eisinga, Zachary | 2-6,1-6 |
| ITF M15 Cairo | 2021/05/04 08:00 | Eisinga, Zachary v Dimitrov, Martin | 1-6,6-7 |
| ITF M15 Cairo | 2021/05/03 08:00 | Eisinga, Zachary v Ali Alshati | 3-6,6-0,10-8 |
| ITF M15 Cairo | 2021/04/28 10:00 | Eisinga, Zachary v Shintaro Mochizuki | 4-6,2-6 |
| ITF M15 Cairo | 2021/04/19 10:30 | Eisinga, Zachary v Fares Zakaria | 2-6,6-3,3-10 |
| ITF M15 Oldenzaal | 2021/08/15 08:30 | Verwater, Yannick v van Baal, Aloys Johannes Willem | 3-6,1-6 |
| ITF M25 The Hague | 2021/06/27 08:00 | van Baal, Aloys Johannes Willem v Raphael Collignon | 4-6,3-6 |
| ITF M15 Skopje | 2021/06/07 09:00 | Max Houkes v van Baal, Aloys Johannes Willem | 6-2,6-2 |
| ITF M15 Skopje | 2021/05/30 07:00 | van Baal, Aloys Johannes Willem v Tom Gentzsch | 1-6,7-5,7-10 |
| ITF - M15 Monastir | 2021/03/28 10:30 | van Baal, Aloys Johannes Willem v Pietro Pampanin | 4-6,2-6 |
| ITF M15 Cairo | 2020/11/29 10:30 | van Baal, Aloys Johannes Willem v Dzhavakian, Yurii | 6-2,4-6,5-10 |
| ITF M15 Alkmaar | 2020/08/23 11:00 | Ivanov, Vladimir v van Baal, Aloys Johannes Willem | 6-2,7-5 |
| ITF - M15 Monastir | 2020/03/09 08:00 | van Baal, Aloys Johannes Willem v Tim Handel | 1-6,1-6 |