Stadium: M Round: 27 Ground: Carpet indoor
| ITF Finland F4 Qual | 2017/11/14 10:30 | Boy Westerhof v Evgeny Tyurnev | 5-7,4-6 |
| Challenger Alphen | 2017/09/07 10:00 | Boy Westerhof v Julien Cagnina | 4-6,3-6 |
| Challenger Alphen | 2017/09/06 10:00 | Boy Westerhof v Matteo Viola | 3-6,6-4,6-3 |
| ITF Netherlands F7 | 2017/09/01 11:00 | Jelle Sels v Boy Westerhof | 6-4,6-2 |
| ITF Netherlands F7 | 2017/08/31 12:45 | Michiel de Krom v Boy Westerhof | 0-6,6-3,4-6 |
| ITF Netherlands F7 | 2017/08/29 15:00 | Mats Hermans v Boy Westerhof | 3-6,2-6 |
| ITF Netherlands F6 | 2017/08/26 10:00 | Gijs Brouwer v Boy Westerhof | 7-6,7-6 |
| ITF Netherlands F6 | 2017/08/25 09:30 | Boy Westerhof v Jelle Sels | 4-6,7-5,6-4 |
| Challenger Andria | 2017/11/22 15:10 | Zdenek Kolar v Igor Sijsling | 6-3,6-3 |
| Challenger Andria | 2017/11/21 12:40 | Constant Lestienne v Igor Sijsling | 4-6,6-2,4-6 |
| Challenger Bratislava | 2017/11/07 12:30 | Igor Sijsling v Niels Desein | 4-6,2-6 |
| Challenger Eckental | 2017/11/02 12:30 | Igor Sijsling v Jerzy Janowicz | 6-7,3-6 |
| Challenger Eckental | 2017/10/31 16:55 | Evan Furness v Igor Sijsling | 3-6,2-6 |
| Challenger Ismaning | 2017/10/18 13:20 | Igor Sijsling v Tristan Lamasine | 6-4,1-6,6-7 |
| Challenger Ismaning | 2017/10/16 15:00 | Alex De Minaur v Igor Sijsling | 4-6,1-6 |
| Challenger Ortisei | 2017/10/10 10:30 | Igor Sijsling v Marc Sieber | 1-6,4-6 |