Stadium: C Round: 26 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 Finland F4 | 2016/11/15 23:00 | Aaro Pollanen v Matvey Khomentovskiy | 2-6,4-6 |
| ITF Finland F4 | 2016/11/14 23:00 | Aaro Pollanen v Otto Virtanen | 6-2,6-0 |
| ITF Estonia F4 | 2016/11/08 23:00 | Aaro Pollanen v Evgeny Tyurnev | 2-6,4-6 |
| ITF Estonia F4 | 2016/11/07 23:00 | Bart Stevens v Aaro Pollanen | 6-2,4-6,4-6 |
| ITF Estonia F2 | 2016/10/24 11:00 | Aaro Pollanen v Ivan Nedelko | 7-6,2-6,5-7 |
| ITF Estonia F2 | 2016/10/23 08:00 | Alex Hedman v Aaro Pollanen | 6-2,5-7,3-6 |
| ITF Finland F3 | 2016/08/15 22:00 | Mauricio Echazu v Aaro Pollanen | 6-2,7-5 |
| ITF Finland F2 Qual | 2016/08/07 11:00 | Jacob Kahoun v Aaro Pollanen | 7-6,6-3 |