Round: 44 Ground: Hardcourt outdoor
| ITF Czech Republic F10 | 2017/11/13 11:30 | Tomas Machac v Marek Semjan | 6-4,6-3 |
| Challenger Bratislava Qual | 2017/11/04 10:20 | Franko Skugor v Marek Semjan | 6-2,6-1 |
| ITF Czech Republic F8 | 2017/11/02 10:20 | Marek Semjan v Matej Vocel | 4-6,6-7 |
| ITF Czech Republic F8 | 2017/11/01 13:55 | Marek Semjan v Maxime Tchoutakian | 5-7,6-4,6-2 |
| ITF Czech Republic F8 Qual | 2017/10/31 11:10 | Marek Semjan v Marko Osmakcic | 6-4,6-4 |
| ITF Czech Republic F8 Qual | 2017/10/30 11:00 | Marek Semjan v David Mrazek | 6-4,6-2 |
| ITF Czech Republic F7 | 2017/10/25 10:45 | Marek Semjan v Robin Stanek | 3-6,7-6,3-6 |
| ITF Czech Republic F7 Qual | 2017/10/24 10:30 | Marek Semjan v Martin Fekiac | 6-4,6-7,6-3 |