| ITF - Colorado Springs W25 | 06/15 16:40 | 26 | Qavia Lopez v Katarina Kozarov | 2-6,2-6 | |
| ITF - Colorado Springs W25 | 06/14 17:05 | 25 | Mia Horvit v Katarina Kozarov | 2-6,4-6 | |
| ITF - Setubal W25 | 06/08 12:15 | 26 | Aliona Falei v Katarina Kozarov | 2-6,6-2,6-3 | |
| ITF - Setubal W25 | 06/07 11:10 | 25 | [495] Katarina Kozarov v Karman Kaur Thandi [268] | 6-3,6-2 | |
| ITF - Yecla W25 | 06/02 12:05 | 27 | Katarina Kozarov v Lucia Peyre | 3-6,6-7 | |
| ITF - Yecla W25 | 06/01 16:00 | 26 | [458] Zongyu Li v Katarina Kozarov [495] | 4-6,6-7 | |
| ITF - Yecla W25 | 05/31 10:35 | 25 | Katarina Kozarov v Riya Bhatia | 6-0,6-3 | |
| ITF - Bethany Beach W25 | 05/18 13:50 | 26 | Ganna Poznikhirenko v Katarina Kozarov | 7-5,3-6,6-3 | |
| ITF - Bethany Beach W25 | 05/17 18:20 | 25 | Luciana Perry v Katarina Kozarov | 3-6,1-6 | |
| ITF - Naples W60 | 05/10 15:35 | 25 | [494] Katarina Kozarov v Renata Zarazua [244] | 2-6,1-6 | |
| ITF - Bonita Springs W100 | 05/02 17:50 | 54 | [414] Cadence Brace v Katarina Kozarov [498] | 6-3,6-2 | |
| ITF - Bonita Springs W100 | 05/01 14:30 | 54 | [458] Dia Evtimova v Katarina Kozarov [498] | 2-6,0-6 | |
| ITF - Kashiwa W25 | 04/05 05:50 | 25 | [493] Katarina Kozarov v Xiaodi You [289] | 4-6,3-6 | |
| ITF - Kashiwa W25 | 04/03 01:00 | 19 | Katarina Kozarov v Ayumi Koshiishi | 6-0,6-3 | |
| ITF - Kofu W25 | 03/29 00:30 | 25 | [493] Katarina Kozarov v Haruka Kaji [298] | 6-7,3-6 | |
| ITF - Kofu W25 | 03/28 07:05 | 62 | Katarina Kozarov v Yu-Yun Li | 6-2,6-1 | |
| ITF - Kofu W25 | 03/28 00:30 | 62 | Katarina Kozarov v Anri Nagata | 6-0,6-3 | |
| ITF - Jakarta W25 | 03/22 04:40 | 25 | Anastasia Kovaleva v Katarina Kozarov | Retired | |
| ITF - Jakarta W25 | 03/21 02:00 | 19 | [435] Haruna Arakawa v Katarina Kozarov [493] | 6-4,2-6,2-10 | |
| ITF - Jakarta W25 | 03/20 02:00 | 44 | Margot Phanthala v Katarina Kozarov | 2-6,1-6 | |
| ITF - Fredericton M25 | 03/09 14:55 | 26 | [488] Katarina Kozarov v Jamie Loeb [228] | 7-6,3-6,2-6 | |
| ITF - Fredericton M25 | 03/08 14:55 | 25 | Katarina Kozarov v Anna-Raphaelle Serghi | 6-1,6-3 | |
| ITF - Toronto W25 | 02/28 15:00 | 25 | Olivia Lincer v Katarina Kozarov | 3-6,6-3,6-3 | |
| ITF - Rome, GA W60 | 01/30 21:15 | 54 | [483] Maria Kononova v Katarina Kozarov [493] | Retired | |
| ITF - Petit-Bourg W25 | 01/21 17:50 | 28 | Emma Lene v Katarina Kozarov | 7-6,6-2 | |
| ITF - Petit-Bourg W25 | 01/20 17:05 | 27 | Sarah Iliev v Katarina Kozarov | 5-7,3-6 | |
| ITF - Petit-Bourg W25 | 01/19 15:50 | 26 | Nehanda Thomias v Katarina Kozarov | 1-6,2-6 | |
| ITF - Petit-Bourg W25 | 01/18 20:50 | 25 | Jaeda Daniel v Katarina Kozarov | 5-7,3-6 | |
| ITF - Malibu W25 | 01/03 23:30 | 25 | Katarina Kozarov v Madison Sieg | 2-6,6-3,11-13 | |
| ITF - Navi Mumbai W25 | 12/22 06:25 | 26 | [429] Katarina Kozarov v Diana Marcinkevica [302] | 4-6,6-2,4-6 |