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