Stadium: Indoor Round: 27 Ground: Clay
| 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 |
| Kaarst, Doubles M-ITF-GER-02B | 2019/02/09 15:10 | Sijsling I / van de Zandschulp B v Rosenkranz M / Whitehouse M | 6-4,6-4 |
| Kaarst, Doubles M-ITF-GER-02B | 2019/02/08 15:00 | Gengel M / Nouza P v Sijsling I / van de Zandschulp B | 4-6,2-6 |
| Kaarst, Doubles M-ITF-GER-02B | 2019/02/07 19:55 | Sijsling I / van de Zandschulp B v Kowalczyk M / Matuszewski P | 6-3,6-2 |
| ITF France F5 MD | 2018/03/12 16:40 | Delage P / Dussin L v Sijsling I / van de Zandschulp B | 4-6,6-0,7-10 |
| ITF Serbia F5 MD | 2018/09/05 15:00 | Klok D / Liska T v Ilic L / Milenkovic N | 6-4,6-2 |
| ITF Serbia F5 MD | 2018/09/04 09:30 | Gazo S / Obradovic D v Ilic L / Milenkovic N | 2-6,2-6 |
| ITF Serbia F8 MD | 2016/09/21 13:45 | Serdarusic N / Zukas M v Ilic L / Milenkovic N | 6-4,6-0 |
| ITF Serbia F8 MD | 2016/09/20 12:45 | Ilic L / Milenkovic N v Delic D / Delic M | 6-4,6-7,10-6 |