| Coupe Davis | 02/02 12:30 | 26 | Adrian Mannarino v de Bakker, Thiemo | 6-7,3-6,3-6 | |
| ITF Egypt F2 | 01/27 08:00 | 28 | de Bakker, Thiemo v Aslan Karatsev | 6-7,4-6 | |
| ITF Egypt F2 | 01/26 08:00 | 27 | Karim-Mohamed Maamoun v de Bakker, Thiemo | 5-7,5-7 | |
| ITF Egypt F2 | 01/25 08:00 | 26 | David Poljak v de Bakker, Thiemo | 1-6,2-6 | |
| ITF Egypt F2 | 01/23 08:00 | 25 | Manafov, Vladyslav v de Bakker, Thiemo | 7-6,1-6,2-6 | |
| ITF Egypt F1 | 01/18 08:00 | 26 | de Bakker, Thiemo v Marcora, Roberto | 5-7,6-7 | |
| ITF Egypt F1 | 01/16 08:00 | 25 | de Bakker, Thiemo v Taweel, Issam Haitham | 6-2,6-4 | |
| ITF Egypt F30 | 10/18 18:10 | 25 | David Jorda Sanchis v de Bakker, Thiemo | 3-6,6-4,6-1 | |
| ITF Egypt F29 | 10/15 14:30 | 29 | Gijs Brouwer v de Bakker, Thiemo | 3-6,6-7 | |
| ITF Egypt F29 | 10/14 16:35 | 28 | [478] Antoine Escoffier v de Bakker, Thiemo [422] | 2-6,3-6 | |
| ITF Egypt F29 | 10/13 14:00 | 27 | [432] Viktor Durasovic v de Bakker, Thiemo [422] | 4-6,2-6 | |
| ITF Egypt F29 | 10/12 14:00 | 26 | Michiel de Krom v de Bakker, Thiemo | 1-6,3-6 | |
| ITF Egypt F29 | 10/11 15:45 | 25 | Vidal Azorin, Jose Fco v de Bakker, Thiemo | 5-7,4-6 | |
| Coupe Davis | 09/17 12:25 | 26 | [408] de Bakker, Thiemo v Lukas Rosol [192] | 3-6,6-4,6-4,6-4 | |
| Coupe Davis | 09/15 12:00 | 26 | [408] de Bakker, Thiemo v Jiri Vesely [59] | 6-4,3-6,6-4,4-6,4-6 | |
| Challenger Alphen | 09/07 18:35 | 26 | [374] de Bakker, Thiemo v Maden, Yannick [185] | 5-7,7-6,1-6 | |
| Challenger Alphen | 09/05 18:00 | 25 | [374] de Bakker, Thiemo v Daniel Masur [259] | 6-4,6-4 | |
| ITF Netherlands F6 | 08/27 13:35 | 29 | Gijs Brouwer v de Bakker, Thiemo | 2-6,3-6 | |
| ITF Netherlands F6 | 08/26 14:00 | 28 | de Bakker, Thiemo v Kocevar-Desman, Tom | 6-3,6-3 | |
| ITF Netherlands F6 | 08/25 15:15 | 27 | Griekspoor, Scott v de Bakker, Thiemo | 1-6,6-7 | |
| ITF Netherlands F6 | 08/24 16:00 | 26 | [497] Stanek, Robin v de Bakker, Thiemo [377] | 6-7,3-6 | |
| ITF Netherlands F6 | 08/22 16:00 | 25 | Van Terheijden, Tim v de Bakker, Thiemo | 5-7,6-3,3-6 | |
| ITF Netherlands F5 | 08/17 09:30 | 26 | Griekspoor, Scott v de Bakker, Thiemo | 6-4,1-6,6-4 | |
| ITF Netherlands F5 | 08/16 12:50 | 25 | Press, Frederik v de Bakker, Thiemo | 3-6,4-6 | |
| Challenger Scheveningen | 07/22 12:10 | 28 | [465] de Bakker, Thiemo v Garcia-Lopez, Guillermo [163] | Retired | |
| Challenger Scheveningen | 07/21 16:30 | 27 | [465] de Bakker, Thiemo v Stefanos Tsitsipas [167] | 6-1,6-4 | |
| Challenger Scheveningen | 07/19 16:40 | 26 | [465] de Bakker, Thiemo v Bellotti, Riccardo [239] | 6-4,6-7,6-2 | |
| Challenger Scheveningen | 07/18 16:30 | 25 | [42] Haase, Robin v de Bakker, Thiemo [465] | 6-7,4-6 | |
| ITF Netherlands F4 | 07/12 16:15 | 25 | Hajek, Petr v de Bakker, Thiemo | Retired | |
| ITF Netherlands F4 | 07/12 06:30 | - | Hajek, Petr v de Bakker, Thiemo | 6-5 |