Round: 27 Ground: Clay
| Davis Cup | 2017/04/09 09:00 | Mattias Siimar v Lucas Catarina | 4-6,6-4,6-7 |
| 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 USA F12 | 2017/04/05 15:00 | Luca Gelhardt v Alexander Sarkissian | 2-6,1-6 |
| ITF USA F12 Qual | 2017/04/03 15:00 | Nicholas Shamma v Luca Gelhardt | 3-6,4-6 |
| ITF USA F10 | 2017/03/16 18:00 | Luca Gelhardt v Sebastian Fanselow | 2-6,0-6 |
| ITF USA F10 | 2017/03/15 18:00 | Ricardo Rodriguez-Pace v Luca Gelhardt | 6-7,3-6 |
| ITF USA F10 Qual | 2017/03/13 17:00 | Benjamin Hannestad v Luca Gelhardt | 3-6,5-7 |
| ITF USA F10 Qual | 2017/03/11 19:00 | Jack Vance v Luca Gelhardt | 0-6,1-6 |
| ITF USA F9 | 2017/02/26 16:00 | Luca Gelhardt v Filip Cristian Jianu | 3-6,6-0,1-6 |
| ITF USA F9 | 2017/02/24 15:00 | Luca Gelhardt v Hleb Maslau | 6-2,6-1 |