Stadium: Center Court Round: 46 Ground: Synthetic indoor
| Challenger Eckental Qual | 2017/10/28 15:55 | Bury, Aliaksandr v Cacic, Nikola | 5-7,2-6 |
| ITF Turkey F39 | 2017/10/17 07:15 | Felipe Meligeni Rodrigues Alves v Cacic, Nikola | 6-4,6-3 |
| ITF Turkey F38 | 2017/10/14 07:30 | Dmitry Popko v Cacic, Nikola | 7-6,3-6,6-3 |
| ITF Turkey F38 | 2017/10/13 08:00 | Galoppini, Davide v Cacic, Nikola | 3-6,7-6,6-7 |
| ITF Turkey F38 | 2017/10/12 07:30 | Samper-Montana, Jordi v Cacic, Nikola | 1-6,6-4,6-7 |
| ITF Turkey F38 | 2017/10/11 07:30 | Cacic, Nikola v Petrone, Alessandro | 3-6,7-6,6-1 |
| Challenger Banja Luka Qual | 2017/09/09 09:55 | Cacic, Nikola v Petr Nouza | 4-6,3-6 |
| ITF Turkey F29 | 2017/08/09 06:00 | Bogajo Fernandez, Fernando v Cacic, Nikola | 6-3,6-4 |
| Challenger Eckental Qual | 2017/10/28 17:10 | Kapas, Andriej v Sieber, Marc | 6-4,4-6,3-6 |
| Brest, France, Qualifying | 2017/10/22 14:45 | Arnaboldi, Andrea v Sieber, Marc | 1-6,6-3,6-3 |
| Brest, France, Qualifying | 2017/10/21 10:55 | Vega Hernandez, David v Sieber, Marc | 2-6,4-6 |
| Challenger Ortisei | 2017/10/13 13:40 | Pierre-Hugues Herbert v Sieber, Marc | 7-6,3-6,6-3 |
| Challenger Ortisei | 2017/10/12 14:00 | Sieber, Marc v Brown, Dustin | 2-6,7-6,7-6 |
| Challenger Ortisei | 2017/10/10 10:30 | Igor Sijsling v Sieber, Marc | 1-6,4-6 |
| Challenger Ortisei Qual | 2017/10/09 08:00 | Edan Leshem v Sieber, Marc | 3-6,4-6 |
| Challenger Ortisei Qual | 2017/10/08 08:00 | Zgombic, Fran Zvonimir v Sieber, Marc | 7-5,0-6,4-6 |