| WTA Pekín | 09/28 07:45 | 24 | [52] Polona Hercog v Julia Goerges [25] | 6-7,7-6,6-4 | |
| WTA Wuhan | 09/23 11:55 | 25 | [7] Petra Kvitova v Polona Hercog [52] | 7-6,6-3 | |
| WTA Wuhan | 09/22 03:00 | 24 | [78] Jessica Pegula v Polona Hercog [51] | 0-6,1-6 | |
| WTA Seoul | 09/17 03:00 | 25 | [51] Polona Hercog v Ana Bogdan [143] | 3-6,6-3,1-6 | |
| WTA Zhengzhou | 09/13 03:00 | 26 | [2] Karolina Pliskova v Polona Hercog [53] | 6-3,7-5 | |
| WTA Zhengzhou | 09/10 06:15 | 25 | Polona Hercog v Meiling Wang | 6-3,6-4 | |
| US Open - Femenino | 08/27 18:05 | 23 | [35] Danielle Collins v Polona Hercog [57] | 6-3,4-6,6-4 | |
| WTA Nueva York | 08/19 17:50 | 25 | [56] Polona Hercog v Aliaksandra Sasnovich [45] | 3-6,2-6 | |
| WTA Cincinnati | 08/10 17:40 | 45 | Polona Hercog v Viktorija Golubic | Cancelled | |
| WTA Toronto | 08/05 17:40 | 24 | [54] Polona Hercog v Julia Goerges [25] | 3-6,6-1,6-7 | |
| WTA Toronto | 08/04 17:50 | 45 | [53] Polona Hercog v Andrea Petkovic [77] | 6-4,6-3 | |
| WTA Toronto | 08/03 17:35 | 44 | [53] Polona Hercog v Allie Kiick [130] | 6-3,6-0 | |
| Wimbledon - Femenino | 07/05 16:15 | 25 | [60] Polona Hercog v Cori Gauff [313] | 6-3,6-7,5-7 | |
| Wimbledon - Femenino | 07/03 18:20 | 24 | [16] Madison Keys v Polona Hercog [60] | 2-6,4-6 | |
| Wimbledon - Femenino | 07/01 10:00 | 23 | [60] Polona Hercog v Viktoria Kuzmova [47] | 4-6,7-6,7-5 | |
| WTA Eastbourne | 06/26 13:45 | 26 | [60] Polona Hercog v Simona Halep [7] | 1-6,6-4,3-6 | |
| WTA Eastbourne | 06/25 15:10 | 25 | [82] Pauline Parmentier v Polona Hercog [60] | 6-2,2-6,6-7 | |
| WTA Eastbourne | 06/24 17:05 | 24 | [60] Polona Hercog v Barbora Strycova [50] | Retired | |
| WTA Eastbourne | 06/22 10:00 | 64 | [61] Polona Hercog v Pauline Parmentier [81] | 4-6,6-1,6-4 | |
| WTA Eastbourne | 06/21 11:10 | 45 | [61] Polona Hercog v Jil Teichmann [94] | 7-5,6-4 | |
| WTA Hertogenbosch | 06/13 14:45 | 26 | [62] Polona Hercog v Alison Riske [61] | 4-6,6-7 | |
| WTA Hertogenbosch | 06/11 10:35 | 25 | [112] Christina McHale v Polona Hercog [62] | 4-6,4-6 | |
| WTA Hertogenbosch | 06/11 09:00 | 25 | Petra Martic v Polona Hercog | Cancelled | |
| Open de Francia - Femenino | 05/31 15:15 | 25 | [7] Sloane Stephens v Polona Hercog [71] | 6-3,5-7,6-4 | |
| Open de Francia - Femenino | 05/29 09:00 | 24 | [80] Jennifer Brady v Polona Hercog [71] | 3-6,7-6,4-6 | |
| Open de Francia - Femenino | 05/26 17:25 | 23 | [71] Polona Hercog v Aliaksandra Sasnovich [34] | 4-6,6-2,8-6 | |
| WTA Roma | 05/13 16:00 | 24 | [14] Madison Keys v Polona Hercog [71] | 6-4,7-6 | |
| WTA Roma | 05/12 09:00 | 46 | [70] Polona Hercog v Viktorija Golubic [77] | 7-5,4-6,6-4 | |
| WTA Roma | 05/11 08:00 | 45 | [56] Yafan Wang v Polona Hercog [70] | 2-6,4-6 | |
| WTA Madrid | 05/05 12:50 | 24 | [8] Sloane Stephens v Polona Hercog [71] | 6-2,7-6 |