| ITF W25 Ceuta | 09/23 10:30 | 28 | [234] Lesley P Kerkhove v Katarina Kozarov [345] | 0-6,4-6 | |
| ITF W25 Ceuta | 09/22 11:25 | 27 | Katarina Kozarov v Clara Vlasselaer | 7-6,6-3 | |
| ITF W25 Ceuta | 09/21 09:10 | 26 | Katarina Kozarov v Laia Petretic | 3-6,6-0,6-0 | |
| ITF W25 Ceuta | 09/19 09:00 | 25 | [345] Katarina Kozarov v Cadence Brace [481] | 4-6,6-3,6-3 | |
| ITF W25 Valladolid | 08/30 10:40 | 25 | [351] Katarina Kozarov v Kubareva, Anna [429] | Retired | |
| ITF W25 Vigo | 08/22 08:00 | 25 | Katarina Kozarov v Urszula Radwanska | Cancelled | |
| WTA Barranquilla | 08/14 20:30 | 25 | [360] Katarina Kozarov v Valentini Grammatikopoulou [164] | 3-6,2-6 | |
| WTA Barranquilla | 08/13 20:30 | 14 | [354] Katarina Kozarov v Yuliana Lizarazo [130] | 6-2,7-5 | |
| ITF W80 Brasilia | 08/07 18:00 | 25 | [166] Natalija Stevanovic v Katarina Kozarov [360] | 3-6,6-3,6-2 | |
| ITF W60 Feira De Santana | 08/03 12:00 | 26 | [325] Jana Kolodynska v Katarina Kozarov [360] | 6-7,6-3,6-3 | |
| ITF W60 Feira De Santana | 08/02 13:50 | 25 | [360] Katarina Kozarov v Rencheli, Abigail [489] | 6-3,7-6 | |
| ITF W60 Evansville | 07/19 16:00 | 25 | Katarina Kozarov v Varvara Lepchenko | 4-6,2-6 | |
| ITF W60 Saskatoon | 07/15 18:30 | 28 | [377] Katarina Kozarov v Emina Bektas [140] | 3-6,2-6 | |
| ITF W60 Saskatoon | 07/14 17:15 | 27 | [377] Katarina Kozarov v Alana Smith [463] | 3-6,7-5,6-3 | |
| ITF W60 Saskatoon | 07/13 16:00 | 26 | [418] Jessica Failla v Katarina Kozarov [377] | 6-7,5-7 | |
| ITF W60 Saskatoon | 07/11 16:00 | 25 | Orly Ogilvy v Katarina Kozarov | 0-6,1-6 | |
| ITF W25 Wichita | 06/22 23:00 | 26 | [478] Katarina Kozarov v Stacey Fung [259] | 2-6,5-7 | |
| ITF W25 Wichita | 06/21 20:00 | 25 | [478] Katarina Kozarov v Paris Corley [483] | 7-6,6-3 | |
| ITF W25 Colorado Springs | 06/18 15:55 | 29 | Allie Kiick v Katarina Kozarov | 3-6,1-6 | |
| ITF W25 Colorado Springs | 06/17 15:50 | 28 | [482] Katarina Kozarov v Saki Imamura [497] | 6-4,6-2 | |
| ITF W25 Colorado Springs | 06/16 17:15 | 27 | Ayana Akli v Katarina Kozarov | 3-6,6-4,5-7 | |
| ITF W25 Colorado Springs | 06/15 16:40 | 26 | Lopez, Qavia v Katarina Kozarov | 2-6,2-6 | |
| ITF W25 Colorado Springs | 06/14 17:05 | 25 | Mia Horvit v Katarina Kozarov | 2-6,4-6 | |
| ITF W25 Setubal | 06/08 12:15 | 26 | Aliona Falei v Katarina Kozarov | 2-6,6-2,6-3 | |
| ITF W25 Setubal | 06/07 11:10 | 25 | [495] Katarina Kozarov v Karman Kaur Thandi [268] | 6-3,6-2 | |
| ITF W25 Yecla | 06/02 12:05 | 27 | Katarina Kozarov v Lucia Peyre | 3-6,6-7 | |
| ITF W25 Yecla | 06/01 16:00 | 26 | [458] Zongyu Li v Katarina Kozarov [495] | 4-6,6-7 | |
| ITF W25 Yecla | 05/31 10:35 | 25 | Katarina Kozarov v Riya Bhatia | 6-0,6-3 | |
| Bethany Beach, Singles W-ITF-USA-17A | 05/18 13:50 | 26 | Poznikhirenko, Ganna v Katarina Kozarov | 7-5,3-6,6-3 | |
| Bethany Beach, Singles W-ITF-USA-17A | 05/17 18:20 | 25 | Luciana Perry v Katarina Kozarov | 3-6,1-6 |