Stadium: Hard Court 5 Round: 26 Ground: Hardcourt outdoor
| ITF Turkey F1 | 2018/01/09 09:15 | Marc Sieber v Vadim Alekseenko | 6-2,6-0 |
| ITF Turkey F1 | 2018/01/08 07:30 | Marc Sieber v Darko Bojanovic | 6-1,6-0 |
| ITF Turkey F1 | 2018/01/07 07:30 | Marc Sieber v Masayoshi Ono | 6-2,6-2 |
| Challenger Bratislava Qual | 2017/11/05 09:00 | Danylo Kalenichenko v Marc Sieber | 7-6,6-3 |
| Challenger Bratislava Qual | 2017/11/04 09:00 | Altug Celikbilek v Marc Sieber | 7-5,1-6,0-6 |
| Challenger Eckental Qual | 2017/10/30 11:20 | Robin Kern v Marc Sieber | 6-4,6-2 |
| Challenger Eckental Qual | 2017/10/29 16:10 | Nikola Cacic v Marc Sieber | 2-6,6-3,1-6 |
| Challenger Eckental Qual | 2017/10/28 17:10 | Andriej Kapas v Marc Sieber | 6-4,4-6,3-6 |
| ITF Slovakia F2 | 2017/08/04 08:00 | Patrik Nema v Nik Razborsek | 6-3,6-4 |
| ITF Slovakia F2 | 2017/08/03 08:00 | Samm Butler v Nik Razborsek | 2-6,1-6 |
| ITF Slovakia F2 | 2017/08/02 14:40 | David Juras v Nik Razborsek | 1-6,0-6 |
| ITF Slovakia F1 | 2017/07/28 11:55 | Danylo Kalenichenko v Nik Razborsek | 7-6,6-2 |
| ITF Slovakia F1 | 2017/07/27 12:25 | Andrew Watson v Nik Razborsek | 4-6,2-6 |
| ITF Slovakia F1 | 2017/07/26 13:30 | Mike Urbanija v Nik Razborsek | 2-6,2-6 |
| ITF Germany F5 | 2017/06/29 10:35 | George Von Massow v Nik Razborsek | 2-6,6-0,6-1 |
| ITF Germany F5 | 2017/06/28 09:00 | Nik Razborsek v Tom Schonenberg | 6-2,6-3 |