Round: 62 Ground: Clay
| Davis Cup | 2017/02/05 08:00 | Lloyd Harris v Mattias Siimar | 7-5,6-3 |
| ITF Egypt F2 | 2017/01/23 08:00 | Libor Salaba v Mattias Siimar | 7-6,6-3 |
| ITF Egypt F2 | 2017/01/22 10:30 | Mattias Siimar v Nicolas Uryson | 6-2,6-7,6-4 |
| ITF Estonia F3 | 2016/11/01 12:05 | Alexander Vasilenko v Mattias Siimar | 6-1,6-3 |
| ITF Estonia F2 | 2016/10/27 14:30 | Kenneth Raisma v Mattias Siimar | 6-1,6-4 |
| ITF Estonia F2 | 2016/10/24 13:00 | Verneri Tuomi v Mattias Siimar | 3-6,0-6 |
| ITF Estonia F1 | 2016/07/26 22:00 | Yann Wojcik v Mattias Siimar | 7-5,7-6 |
| ITF Estonia F1 | 2016/07/25 22:00 | Mattias Siimar v Karl Kiur Saar | 2-6,6-3,6-3 |
| ITF Turkey F7 | 2017/02/19 06:30 | Piotr Grynkowski v Pavel Krainik | 1-6,4-6 |
| ITF Turkey F6 | 2017/02/12 07:00 | Domagoj Biljesko v Piotr Grynkowski | 6-4,6-4 |
| ITF Turkey F6 | 2017/02/11 06:00 | Piotr Grynkowski v Kevin Lynch | 6-2,4-6,6-2 |
| ITF Turkey F42 | 2016/10/17 07:30 | Volodymyr Uzhylovskyi v Piotr Grynkowski | 6-4,6-2 |
| ITF Turkey F42 | 2016/10/16 07:30 | Polat Gulcur v Piotr Grynkowski | 1-6,6-7 |
| ITF Turkey F41 | 2016/10/13 10:25 | Vadym Ursu v Piotr Grynkowski | 6-3,6-2 |
| ITF Turkey F41 | 2016/10/11 09:10 | Piotr Grynkowski v Peter Bothwell | 6-3,1-6,6-4 |
| ITF Hungary F4 | 2016/09/05 08:00 | Piotr Grynkowski v Rudolfs Mednis | 2-6,7-5,1-6 |