| UTR Pro California | 2023/12/23 16:00 | Ryan Seggerman v Boris Kozlov | 6-7,1-6 |
| UTR Pro California | 2023/12/23 01:10 | Markos Kalovelonis v Boris Kozlov | 1-6,2-6 |
| UTR Pro California | 2023/12/20 01:23 | Spencer Johnson v Boris Kozlov | 4-6,2-6 |
| UTR Pro California | 2023/12/19 16:00 | Dominique Rolland v Boris Kozlov | 3-6,0-6 |
| UTR Pro California | 2023/12/18 17:30 | Boris Kozlov v Juan Carlos Aguilar | 2-6,3-6 |
| UTR Pro Florida | 2023/12/15 13:00 | Roberto Cid Subervi v Boris Kozlov | 6-0,3-6,6-1 |
| UTR Pro Florida | 2023/12/12 17:00 | Adrien Burdet v Boris Kozlov | 1-6,7-6,6-0 |
| UTR Pro Florida | 2023/12/11 15:30 | John Chin v Boris Kozlov | 5-7,3-6 |
| UTR Pro California | 2023/12/23 18:10 | Samuel Sippel v Alejandro Jacome | 6-0,6-2 |
| UTR Pro California | 2023/12/20 21:40 | Samuel Sippel v Chase Thompson | 6-2,6-4 |
| UTR Pro California | 2023/12/19 21:45 | Pawit Sornlaksup v Samuel Sippel | 3-6,7-5,6-3 |
| UTR Pro California | 2023/12/18 22:48 | Rahul Sachdev v Samuel Sippel | 4-6,2-6 |
| UTR Pro California | 2023/12/17 21:45 | Lawee Sherif v Samuel Sippel | 3-6,3-6 |
| UTR Pro Tennis Series California | 2022/12/22 23:10 | Samuel Sippel v Philip Hjorth | 5-7,6-2,6-5 |
| UTR Pro Tennis Series California | 2022/12/21 17:00 | Maxwell McKennon v Samuel Sippel | 6-3,6-3 |
| UTR Pro Tennis Series California | 2022/12/20 17:00 | Stefan Menichella v Samuel Sippel | 6-4,5-7,7-5 |