Round: 62 Ground: Clay
| ITF Poland F4 Qual | 2017/07/01 13:00 | Mattias Siimar v Alessandro Ingarao | 6-1,6-3 |
| ITF Poland F3 | 2017/06/28 09:00 | Mattias Siimar v Markus Eriksson | 2-6,1-6 |
| ITF Poland F3 | 2017/06/27 14:10 | Mattias Siimar v Kris Krawcewicz | 6-3,6-2 |
| ITF Poland F3 Qual | 2017/06/26 09:00 | Karl Friberg v Mattias Siimar | 4-6,6-2,0-6 |
| ITF Poland F3 Qual | 2017/06/25 08:00 | Elliott Orkin v Mattias Siimar | 5-7,1-6 |
| ITF Italy F16 Qual | 2017/06/04 13:05 | Wilson Leite v Mattias Siimar | 6-4,6-0 |
| ITF Italy F16 Qual | 2017/06/03 08:30 | Paolo Dagnino v Mattias Siimar | 2-6,3-6 |
| Davis Cup | 2017/04/09 09:00 | Mattias Siimar v Lucas Catarina | 4-6,6-4,6-7 |
| ITF Poland F3 Qual | 2017/06/25 08:00 | Lev Kazakov v Kristofer Siimar | 7-5,6-3 |
| ITF Poland F1 | 2017/06/11 08:00 | Kristofer Siimar v Linus Frost | 1-6,6-3,0-6 |
| Davis Cup | 2017/04/09 11:10 | Kristofer Siimar v Thomas Oger | 4-6,4-6 |
| ITF Estonia F3 | 2016/11/01 13:25 | Kristofer Siimar v Vladimir Ivanov | 0-6,4-6 |
| ITF Estonia F2 | 2016/10/24 15:00 | Dzmitry Zhyrmont v Kristofer Siimar | 6-0,6-0 |
| ITF Estonia F1 | 2015/11/09 08:00 | Vitaly Kozyukov v Kristofer Siimar | 6-2,6-3 |
| ITF Estonia F3 | 2015/11/03 15:00 | Kenneth Raisma v Kristofer Siimar | 6-2,6-0 |
| ITF Lithuania F1 | 2015/07/21 10:25 | Claudio Fortuna v Kristofer Siimar | 7-5,6-0 |