Stadium: Estadio Lorenzo Molina Round: 14 Ground: Clay
| UTR Pro California | 2023/12/23 20:40 | Kozlov, Boris v Samuel Sippel | 2-6,3-5 |
| UTR Pro California | 2023/12/23 16:00 | Seggerman, Ryan v Kozlov, Boris | 6-7,1-6 |
| UTR Pro California | 2023/12/23 01:10 | 칼로벨로니스, 마르코스 v Kozlov, Boris | 1-6,2-6 |
| UTR Pro California | 2023/12/20 01:23 | Spencer Johnson v Kozlov, Boris | 4-6,2-6 |
| UTR Pro California | 2023/12/19 16:00 | Dominique Rolland v Kozlov, Boris | 3-6,0-6 |
| UTR Pro California | 2023/12/18 17:30 | Kozlov, Boris v Aguilar, Juan Carlos | 2-6,3-6 |
| UTR Pro Florida | 2023/12/15 13:00 | 시드 수베르비, 로베르토 v Kozlov, Boris | 6-0,3-6,6-1 |
| UTR Pro Florida | 2023/12/12 17:00 | Burdet, Adrien v Kozlov, Boris | 1-6,7-6,6-0 |