Stadium: Court 1 Round: 25 Ground: Hardcourt indoor
| ITF M15 Haren | 2019/08/30 12:30 | Seifert, Stefan v Eisinga, Zachary | 5-7,6-3,3-6 |
| 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 M15 Haren | 2019/08/30 18:10 | Galarza, Juan Ignacio v Ryan Nijboer | 7-5,6-7,7-6 |
| ITF M15 Haren | 2019/08/29 13:10 | Guy Den Heijer v Ryan Nijboer | 3-6,3-6 |
| ITF M15 Haren | 2019/08/28 09:00 | Mannapov, Alexander v Ryan Nijboer | 3-6,2-6 |
| ITF M15 Oldenzaal | 2019/08/17 14:35 | Jesper De Jong v Ryan Nijboer | 6-4,1-6,6-4 |
| ITF M15 Oldenzaal | 2019/08/16 09:55 | van Beem, Colin v Ryan Nijboer | 6-7,2-6 |
| ITF M15 Oldenzaal | 2019/08/15 13:50 | Knoop, Herman Meeuwes Mattheo v Ryan Nijboer | 3-6,4-6 |
| ITF M15 Oldenzaal | 2019/08/14 11:15 | van Der Horst, Tim v Ryan Nijboer | 2-6,1-6 |
| Challenger Amersfoort | 2019/07/15 16:30 | Ryan Nijboer v Sebastian Fanselow | 4-6,2-6 |