Round: 26 Ground: Hardcourt outdoor
| ITF Poland F3 | 2017/06/27 14:10 | Siimar, Mattias v Kris Krawcewicz | 6-3,6-2 |
| ITF Poland F3 Qual | 2017/06/26 09:00 | Karl Friberg v Siimar, Mattias | 4-6,6-2,0-6 |
| ITF Poland F3 Qual | 2017/06/25 08:00 | Orkin, Elliott v Siimar, Mattias | 5-7,1-6 |
| ITF Italy F16 Qual | 2017/06/04 13:05 | Wilson Leite v Siimar, Mattias | 6-4,6-0 |
| ITF Italy F16 Qual | 2017/06/03 08:30 | Dagnino, Paolo v Siimar, Mattias | 2-6,3-6 |
| Coupe Davis | 2017/04/09 09:00 | Siimar, Mattias v Lucas Catarina | 4-6,6-4,6-7 |
| Coupe Davis | 2017/02/05 08:00 | Lloyd Harris v Siimar, Mattias | 7-5,6-3 |
| ITF Egypt F2 | 2017/01/23 08:00 | Salaba, Libor v Siimar, Mattias | 7-6,6-3 |
| ITF Poland F3 | 2017/06/27 13:40 | Piotr Grynkowski v Eriksson, Markus | 2-6,2-6 |
| ITF Poland F2 | 2017/06/25 12:00 | Eriksson, Markus v Stanek, Robin | 7-5,6-1 |
| ITF Poland F2 | 2017/06/24 15:50 | Eriksson, Markus v Pawel Juszczak | 6-1,6-3 |
| ITF Poland F2 | 2017/06/23 10:00 | Eriksson, Markus v David Poljak | 6-4,6-3 |
| ITF Poland F2 | 2017/06/23 09:30 | Eriksson, Markus v David Poljak | 6-4,5-3 |
| ITF Poland F2 | 2017/06/21 11:30 | Eriksson, Markus v Ameal, Juan Ignacio | 4-6,6-1,6-2 |
| ITF Poland F2 | 2017/06/19 13:50 | Eriksson, Markus v Matuszewski, Piotr | 4-6,6-3,6-4 |
| Challenger Lyon Qual | 2017/06/10 17:15 | Maxime Chazal v Eriksson, Markus | 7-5,6-3 |