Round: 25 Ground: Hardcourt indoor
| Challenger Charlottesville | 2015/11/05 00:05 | Henri Laaksonen v Harrison, Ryan | 7-5,7-5 |
| Challenger Charlottesville | 2015/11/02 23:30 | Tennys Sandgren v Harrison, Ryan | 5-7,3-6 |
| Challenger Las Vegas | 2015/10/20 21:00 | Michael Mmoh v Harrison, Ryan | 6-2,6-3 |
| Challenger Fairfield | 2015/10/12 23:30 | Darian King v Harrison, Ryan | 6-4,7-5 |
| Challenger Tiburon | 2015/09/29 20:25 | Harrison, Ryan v Baughman, Deiton | 6-3,6-3 |
| Challenger Columbus | 2015/09/27 15:00 | Harrison, Ryan v Novikov, Dennis | 4-6,6-3,3-6 |
| Challenger Columbus | 2015/09/26 17:00 | Smyczek, Tim v Harrison, Ryan | 6-7,7-6,1-6 |
| Challenger Columbus | 2015/09/25 17:00 | Harrison, Ryan v Henri Laaksonen | 6-3,6-3 |
| Challenger Charlottesville | 2015/11/04 16:00 | Nielsen, Frederik v Kavcic, Blaz | 6-3,5-7,6-4 |
| Challenger Las Vegas | 2015/10/24 21:20 | de Bakker, Thiemo v Kavcic, Blaz | 7-6,4-6,6-4 |
| Challenger Las Vegas | 2015/10/23 20:25 | Donaldson, Jared v Kavcic, Blaz | 6-3,5-7,1-6 |
| Challenger Las Vegas | 2015/10/21 18:00 | Kavcic, Blaz v Smyczek, Tim | 7-6,6-4 |
| Challenger Las Vegas | 2015/10/19 21:30 | Bester, Philip v Kavcic, Blaz | 5-7,0-6 |
| Challenger Fairfield | 2015/10/16 21:00 | Taylor Fritz v Kavcic, Blaz | 6-4,6-1 |
| Challenger Fairfield | 2015/10/15 19:40 | Jason Jung v Kavcic, Blaz | 5-7,3-6 |
| Umag, Croatia | 2015/07/23 17:30 | Kavcic, Blaz v Bautista-Agut, Roberto | 1-6,2-6 |