Stadium: Indoor 2 Round: 27 Ground: Clay
| ITF M25 Doboj MD | 2019/05/14 13:05 | Stojanovic L / Zhu M v Ejupovic E / Strombachs R | 4-6,3-6 |
| ITF M25 Doboj MD | 2019/05/14 14:45 | Katic D / Pjeranovic S v Sijsling I / van de Zandschulp B | 1-6,1-6 |
| Prijedor, Doubles M-ITF-BIH-01A | 2019/05/11 14:15 | Sijsling I / van de Zandschulp B v Celebic L / Fatic N | 3-6,6-3,10-4 |
| Prijedor, Doubles M-ITF-BIH-01A | 2019/05/11 12:35 | Sabanov/Sabanov v Sijsling I / van de Zandschulp B | 6-3,1-6,3-10 |
| Prijedor, Doubles M-ITF-BIH-01A | 2019/05/09 13:15 | Sijsling I / van de Zandschulp B v Ilic L / Milenkovic N | 6-4,7-5 |
| Prijedor, Doubles M-ITF-BIH-01A | 2019/05/08 13:30 | Sijsling I / van de Zandschulp B v Merino A / Pena Lopez M | 6-2,7-6 |
| ITF - M15 Sharm El Sheikh - Doubles Hommes | 2019/03/23 09:30 | Dev/Kalyanpur v Sijsling I / van de Zandschulp B | 6-7,6-2,6-10 |
| ITF - M15 Sharm El Sheikh - Doubles Hommes | 2019/03/22 10:40 | Goveas A / Samaha G v Sijsling I / van de Zandschulp B | 6-2,4-6,7-10 |
| ITF - M15 Sharm El Sheikh - Doubles Hommes | 2019/03/21 12:35 | Fortuna C / Maiga R v Sijsling I / van de Zandschulp B | 6-4,2-6,4-10 |