Select tournament type
| 1/16-finals | Kozlov S. | Zink T. | 2:0 (6:4, 6:1) | details | 06.01.2026 | ||
| Quarter-finals | Gomez J. S. | Kozlov S. | 2:1 (4:6, 6:4, 7:5) | details | 28.11.2025 | ||
| 1/8-finals | Jorda Sanchis D. | Kozlov S. | 0:2 (4:6, 4:6) | details | 27.11.2025 | ||
| 1/16-finals | Torres J. B. | Kozlov S. | 1:2 (0:6, 6:4, 3:6) | details | 25.11.2025 | ||
| 1/16-finals | Habib H. | Kozlov S. | CAN. | details | 18.11.2025 | ||
| Final | Kozlov S. | Cassone M. | 2:0 (7:63, 7:5) | details | 16.11.2025 | ||
| Semi-finals | Stebe C. | Kozlov S. | 0:1 RET. (0:6, 0:4) | details | 15.11.2025 | ||
| Quarter-finals | Blanch Dar. | Kozlov S. | 1:2 (2:6, 7:67, 3:6) | details | 15.11.2025 | ||
| 1/8-finals | Kozlov S. | Zink T. | 2:0 (6:3, 6:3) | details | 13.11.2025 | ||
| 1/16-finals | Kozlov S. | Borg L. | 2:0 (6:1, 6:0) | details | 11.11.2025 | ||
| 1/8-finals | Kozlov S. | Clarke J. | 1:2 (2:6, 6:2, 3:6) | details | 05.11.2025 | ||
| 1/16-finals | Kozlov S. | Rolland D. | 2:1 (7:61, 2:6, 6:1) | details | 03.11.2025 | ||
| Final | Kozlov S. | Huang T. | 1:2 (6:1, 5:7, 2:6) | details | 04.08.2025 | ||
| Semi-finals | Kozlov S. | Ramanathan R. | 1:1 RET. (6:1, 64:7, 5:3) | details | 03.08.2025 | ||
| 1/16-finals | Krueger M. | Kozlov S. | 2:1 (6:1, 3:6, 6:1) | details | 07.07.2025 | ||
| Final | Kozlov S. | Tudorica A. N. | 0:2 (5:7, 3:6) | details | 02.06.2025 | ||
| Semi-finals | Kozlov S. | Milavsky D. | 2:1 (6:3, 67:7, 6:3) | details | 02.06.2025 | ||
| 1/8-finals | Andrade A. | Kozlov S. | 2:1 (6:1, 4:6, 7:5) | details | 29.05.2025 | ||
| 1/16-finals | Kozlov S. | Dougaz A. | 2:1 (5:7, 6:3, 6:2) | details | 28.05.2025 | ||
| Final | Kozlov S. | Ejupovic E. | 2:0 (6:4, 7:65) | details | 28.05.2025 | ||
| Semi-finals | Kozlov S. | Pannu K. | 2:1 (7:63, 2:6, 6:2) | details | 27.05.2025 | ||
| Final | Rodriguez Taverna S. | Kozlov S. | 1:2 (7:64, 4:6, 4:6) | details | 18.05.2025 | ||
| Semi-finals | Kozlov S. | McKennon M. | 2:1 (2:6, 6:1, 6:4) | details | 18.05.2025 | ||
| Quarter-finals | Kozlov S. | Mayo A. | 2:0 (6:4, 6:4) | details | 17.05.2025 | ||
| 1/8-finals | Kozlov S. | Nefve A. | 2:0 (6:4, 6:4) | details | 15.05.2025 | ||
| 1/16-finals | Kozlov S. | Sanchez Ballinas M. | 2:0 (6:1, 6:1) | details | 15.05.2025 | ||
| Quarter-finals | Spizzirri E. | Kozlov S. | 2:0 (6:3, 7:5) | details | 25.04.2025 | ||
| 1/8-finals | Kozlov S. | Blancaneaux G. | 1:0 RET. (6:1, 3:1) | details | 24.04.2025 | ||
| 1/16-finals | Wiskandt M. | Kozlov S. | 0:2 (2:6, 1:6) | details | 22.04.2025 | ||
| Final | Sigsgaard C. | Kozlov S. | 0:2 (4:6, 4:6) | details | 21.04.2025 | ||
| Semi-finals | Fishback R. | Kozlov S. | 0:2 (5:7, 3:6) | details | 20.04.2025 | ||
| 1/8-finals | Kozlov S. | Jodar R. | 1:2 (5:7, 6:3, 2:6) | details | 02.04.2025 | ||
| 1/16-finals | Tirante T. A. | Kozlov S. | 1:2 (6:4, 4:6, 2:6) | details | 01.04.2025 | ||
| Final | Kozlov S. | Basavareddy N. | 0:2 (2:6, 4:6) | details | 24.02.2025 | ||
| Semi-finals | Vale D. | Kozlov S. | 0:2 (1:6, 4:6) | details | 23.02.2025 | ||
| Semi-finals | Hijikata R. | Kozlov S. | CAN. | details | 23.02.2025 | ||
| Semi-finals | Kozlov S. | Svajda Z. | 0:2 (3:6, 0:6) | details | 08.02.2025 | ||
| Quarter-finals | Wolf J.J. | Kozlov S. | 2:0 (6:1, 6:3) | details | 01.02.2025 | ||
| 1/8-finals | Kozlov S. | Bigun K. | 2:0 (6:2, 6:3) | details | 30.01.2025 | ||
| 1/16-finals | Braswell M. | Kozlov S. | 1:2 (6:4, 3:6, 4:6) | details | 28.01.2025 | ||
| 1/16-finals | Moller E. | Kozlov S. | 2:0 (6:3, 7:5) | details | 22.01.2025 | ||
| Final | Massard L. | Kozlov S. | 1:2 (6:4, 2:6, 4:6) | details | 21.01.2025 | ||
| Semi-finals | Kozlov S. | Misolic F. | 2:0 (6:3, 6:4) | details | 20.01.2025 | ||
| 1/8-finals | Escobar G./Reyes-Varela M. A. | Kozlov S./Rodriguez Taverna S. | 2:0 (6:4, 6:2) | details | 26.11.2025 | ||
| 1/8-finals | Kozlov S./McCormick T. | Hernandez A./Pacheco Mendez R. | CAN. | details | 19.11.2025 | ||
| 1/8-finals | Kozlov S./Perez B. | Harper P./Mitsui S. | 1:2 (6:4, 3:6, 5:10) | details | 12.11.2025 | ||
| 1/8-finals | Kozlov B./Kozlov S. | Krueger M./Maginley J. | 0:2 (4:6, 3:6) | details | 06.11.2025 | ||
| 1/8-finals | Goldhoff G./Hilderbrand T. | Kozlov S./Vance J. | 2:0 (6:3, 6:1) | details | 05.06.2025 | ||
| 1/8-finals | Kozlov B./Kozlov S. | Hach Verdugo H./Mejia N. | 1:2 (3:6, 6:3, 9:11) | details | 23.04.2025 | ||
| 1/8-finals | Kozlov B./Kozlov S. | Goldhoff G./Hilderbrand T. | 0:2 (1:6, 1:6) | details | 29.01.2025 | ||