Round: 25 Ground: Hardcourt outdoor
| ATP - Cincinnati | 2015/08/17 15:00 | Gilles Simon v Ivo Karlovic | 4-6,7-6,3-6 |
| ATP - Montreal | 2015/08/13 16:30 | Jeremy Chardy v Ivo Karlovic | 4-6,7-6,6-4 |
| ATP - Montreal | 2015/08/12 00:30 | Ivo Karlovic v Milos Raonic | 7-6,7-6 |
| ATP - Montreal | 2015/08/10 18:55 | Jerzy Janowicz v Ivo Karlovic | 4-6,6-7 |
| ATP - Washington | 2015/08/06 04:00 | Alexandr Dolgopolov v Ivo Karlovic | 6-4,7-6 |
| ATP - Newport | 2015/07/19 18:00 | Rajeev Ram v Ivo Karlovic | 7-6,5-7,7-6 |
| ATP - Newport | 2015/07/18 20:00 | Jack Sock v Ivo Karlovic | 6-7,4-6 |
| ATP - Newport | 2015/07/17 17:00 | Dustin Brown v Ivo Karlovic | 6-7,3-6 |
| ATP - Cincinnati | 2015/08/16 18:00 | Dominic Thiem v Martin Klizan | 6-7,6-3,6-7 |
| ATP - Montreal | 2015/08/10 16:30 | Sam Querrey v Martin Klizan | 6-3,6-3 |
| ATP - Kitzbühel | 2015/08/05 09:30 | Paul-Henri Mathieu v Martin Klizan | 6-3,7-5 |
| ATP - Hamburg | 2015/07/28 09:00 | Andreas Seppi v Martin Klizan | 6-2,6-4 |
| ATP - Umag | 2015/07/23 15:30 | Andreas Haider-Maurer v Martin Klizan | 6-4,6-4 |
| ATP - Umag | 2015/07/21 19:20 | Pablo Carreno Busta v Martin Klizan | 6-7,7-6,1-6 |
| Davis Cup | 2015/07/19 10:00 | Marius Copil v Martin Klizan | 6-7,3-6,3-6 |
| Davis Cup | 2015/07/17 14:05 | Adrian Ungur v Martin Klizan | 4-6,2-6,0-6 |