| Open de Australia - Femenino | 02/08 00:00 | 23 | [51] Polona Hercog v Caroline Garcia [43] | 6-7,3-6 | |
| WTA Gippsland Trophy | 02/02 01:55 | 25 | [71] Daria Kasatkina v Polona Hercog [49] | 6-4,6-3 | |
| WTA Gippsland Trophy | 01/31 03:10 | 24 | [125] Margarita Gasparyan v Polona Hercog [49] | 6-2,3-6,3-6 | |
| WTA Abu Dabi | 01/07 07:15 | 24 | [10] Aryna Sabalenka v Polona Hercog [49] | 7-6,6-2 | |
| ITF W100 Dubái | 12/11 12:30 | 28 | [86] Sorana Cirstea v Polona Hercog [52] | 7-5,4-6,7-5 | |
| ITF W100 Dubái | 12/10 06:30 | 27 | [73] Arantxa Rus v Polona Hercog [52] | 2-6,4-6 | |
| ITF W100 Dubái | 12/09 08:10 | 26 | [103] Aliona Bolsova Zadoinov v Polona Hercog [52] | 2-6,6-7 | |
| ITF W100 Dubái | 12/08 12:55 | 25 | [97] Viktoria Kuzmova v Polona Hercog [52] | 5-7,3-6 | |
| Open de Francia - Femenino | 10/01 11:15 | 24 | [47] Polona Hercog v Leylah Fernandez [100] | 4-6,6-3,1-6 | |
| Open de Francia - Femenino | 09/28 18:35 | 23 | [305] Diane Parry v Polona Hercog [47] | 4-6,2-6 | |
| WTA Estrasburgo | 09/21 09:35 | 25 | [50] Polona Hercog v Alize Cornet [51] | 3-6,4-6 | |
| WTA Roma | 09/18 18:50 | 26 | [50] Polona Hercog v Marketa Vondrousova [19] | 6-1,1-6,6-7 | |
| WTA Roma | 09/17 16:45 | 25 | [8] Kiki Bertens v Polona Hercog [50] | 4-6,4-6 | |
| WTA Roma | 09/15 11:50 | 24 | [102] Kaja Juvan v Polona Hercog [50] | 6-4,4-6,1-6 | |
| WTA Estambul | 09/11 13:20 | 27 | [49] Polona Hercog v Paula Badosa [94] | 6-4,3-6,4-6 | |
| WTA Estambul | 09/10 10:00 | 26 | [49] Polona Hercog v Jasmine Paolini [97] | 7-5,6-4 | |
| WTA Estambul | 09/08 16:00 | 25 | [49] Polona Hercog v Berfu Cengiz [387] | 6-2,6-3 | |
| WTA Praga | 08/11 11:35 | 25 | [2] Simona Halep v Polona Hercog [46] | 6-1,1-6,7-6 | |
| WTA Palermo | 08/03 16:05 | 25 | [45] Polona Hercog v Elisabetta Cocciaretto [156] | 6-7,3-6 | |
| WTA Doha | 02/23 15:25 | 24 | [48] Alison Van Uytvanck v Polona Hercog [43] | 6-2,6-2 | |
| WTA Dubai | 02/17 06:30 | 46 | [38] Kristina Mladenovic v Polona Hercog [43] | 6-3,6-1 | |
| WTA Dubai | 02/16 07:55 | 45 | [187] Xinyun Han v Polona Hercog [43] | 2-6,4-6 | |
| WTA Dubai | 02/15 09:35 | 44 | [210] Xiaodi You v Polona Hercog [43] | 3-6,3-6 | |
| Open de Australia - Femenino | 01/22 02:00 | 24 | [1] Ashleigh Barty v Polona Hercog [48] | 6-1,6-4 | |
| Open de Australia - Femenino | 01/21 00:00 | 23 | [48] Polona Hercog v Rebecca Peterson [44] | 6-3,6-3 | |
| WTA Moscú | 10/16 08:00 | 26 | [49] Polona Hercog v Belinda Bencic [10] | 6-1,3-6,4-6 | |
| WTA Moscú | 10/15 11:20 | 25 | [49] Polona Hercog v Katerina Siniakova [60] | 6-4,6-2 | |
| WTA Linz | 10/08 18:50 | 25 | [48] Polona Hercog v Donna Vekic [21] | 1-6,1-6 | |
| WTA Pekín | 10/02 12:05 | 26 | [51] Polona Hercog v Kiki Bertens [8] | 6-7,6-2,3-6 | |
| WTA Pekín | 10/01 08:25 | 25 | [13] Angelique Kerber v Polona Hercog [51] | 4-6,2-6 |