Stadium: Court 10 Round: 27 Ground: Clay
| ITF M15 Haren | 2019/08/29 10:40 | Kristjan Tamm v Seifert, Stefan | 3-6,3-6 |
| ITF M15 Haren | 2019/08/28 09:00 | Seifert, Stefan v Vilaro, Alejo | 6-1,6-3 |
| Chiswick, Singles W-ITF-GBR-09A | 2019/08/09 12:35 | Jurij Rodionov v Seifert, Stefan | 6-4,6-4 |
| Chiswick, Singles W-ITF-GBR-09A | 2019/08/08 09:00 | Pauwels, Maxime v Seifert, Stefan | 5-7,2-6 |
| Chiswick, Singles W-ITF-GBR-09A | 2019/08/07 09:00 | Seifert, Stefan v Vilardo, Francesco | 6-3,6-1 |
| Chiswick, Singles W-ITF-GBR-09A | 2019/08/05 18:00 | Seifert, Stefan v Michael Shaw | 6-2,6-7,10-7 |
| Chiswick, Singles W-ITF-GBR-09A | 2019/08/05 11:00 | Seifert, Stefan v Jhun, Alexander | 6-2,6-0 |
| ITF Greece F8 | 2018/11/15 08:00 | Seifert, Stefan v Rapp, Austin | 0-6,2-6 |
| ITF M15 Haren | 2019/08/29 10:45 | Eisinga, Zachary v Mats Rosenkranz | 6-3,7-6 |
| ITF M15 Haren | 2019/08/27 14:15 | Max Houkes v Eisinga, Zachary | 3-6,1-6 |
| ITF M15 Oldenzaal | 2019/08/16 09:00 | Eisinga, Zachary v Stevens, Bart | 2-6,6-3,5-7 |
| ITF M15 Oldenzaal | 2019/08/15 15:20 | Eisinga, Zachary v Guy Den Heijer | 7-6,7-5 |
| ITF M15 Oldenzaal | 2019/08/14 11:00 | Niels Lootsma v Eisinga, Zachary | 7-6,3-6,1-6 |
| ITF M15 Eupen | 2019/08/06 08:00 | Eisinga, Zachary v Hiramatsu, Shinnosuke | 6-4,2-6,9-11 |
| ITF M15 Eupen | 2019/08/05 09:00 | Hellfritsch, Lucas v Eisinga, Zachary | 7-6,6-7,4-10 |
| ITF M15 Alkmaar | 2019/06/27 09:55 | Eisinga, Zachary v Andrea Bolla | 6-7,3-6 |