Player
🇺🇸 Stefan Kozlov
Career matches 610
Wins 340
Losses 270
Win rate 55.7%
Elo (current) 2,170 2026-04-22
Surface breakdown
Hard 56.9% 252W – 191L (443 matches)
Clay 56.8% 75W – 57L (132 matches)
Grass 37.1% 13W – 22L (35 matches)
Career form (last 10)
WLLWWWLLLW
Newest on left. Hover for details.
Head-to-head (top 5 opponents)
| Opponent | Played | W | L | W% |
|---|---|---|---|---|
| J.J. Wolf | 10 | 5 | 5 | 50% |
| Mitchell Krueger | 10 | 5 | 5 | 50% |
| Tennys Sandgren | 9 | 6 | 3 | 67% |
| Steve Johnson | 8 | 5 | 3 | 63% |
| Darian King | 7 | 1 | 6 | 14% |
Recent matches
1–50 of 610
| Date | Tournament | Round | Winner | Loser | Score | Surface |
|---|---|---|---|---|---|---|
| 2026-04-20 | Savannah | Round of 32 | Stefan Kozlov | Daniil Glinka | 6-2 6-3 | Clay |
| 2026-04-20 | Savannah | Round of 16 | Nick Hardt | Stefan Kozlov | 6-2 2-6 6-0 | Clay |
| 2026-04-13 | Tallahassee | Round of 32 | Alex Rybakov | Stefan Kozlov | 7-6(3) 6-2 | Clay |
| 2026-04-13 | Tallahassee | 2nd Round Qualifying | Stefan Kozlov | Kilian Feldbausch | 6-1 4-6 7-6(2) | Clay |
| 2026-04-13 | Tallahassee | 1st Round Qualifying | Stefan Kozlov | Strong Kirchheimer | 6-0 6-4 | Clay |
| 2026-04-06 | Mexico City | Round of 32 | Stefan Kozlov | Raphael Perot | 6-3 6-1 | Clay |
| 2026-04-06 | Mexico City | Round of 16 | James Duckworth | Stefan Kozlov | 6-3 6-2 | Clay |
| 2026-03-30 | San Luis Potosi | Round of 32 | Alan Magadan | Stefan Kozlov | 6-3 7-6(7) | Clay |
| 2026-03-23 | Morelia | Round of 32 | Andres Martin | Stefan Kozlov | 6-2 6-2 | Hard |
| 2026-03-16 | Morelos | Round of 32 | Stefan Kozlov | Alan Magadan | 6-4 6-4 | Hard |
| 2026-03-16 | Morelos | Round of 16 | Michael Mmoh | Stefan Kozlov | 7-5 6-2 | Hard |
| 2026-03-10 | Phoenix | Round of 32 | Jay Friend | Stefan Kozlov | 6-2 4-6 6-3 | Hard |
| 2026-03-10 | Phoenix | 2nd Round Qualifying | Stefan Kozlov | Marc Polmans | 6-1 3-6 6-4 | Hard |
| 2026-03-10 | Phoenix | 1st Round Qualifying | Stefan Kozlov | Nathan Ponwith | 7-5 6-4 | Hard |
| 2026-02-23 | Acapulco | 1st Round Qualifying | Patrick Kypson | Stefan Kozlov | 7-6(3) 6-0 | Hard |
| 2026-02-16 | Metepec | Round of 32 | Stefan Kozlov | Tristan Mccormick | 6-3 6(4)-7 6-4 | Hard |
| 2026-02-16 | Metepec | Round of 16 | Stefan Kozlov | Karl Poling | 6-4 7-6(4) | Hard |
| 2026-02-16 | Metepec | Quarterfinals | Rodrigo Pacheco Mendez | Stefan Kozlov | 6-4 6-2 | Hard |
| 2026-02-02 | Cleveland | Round of 32 | Stefan Kozlov | Cedrik Marcel Stebe | 3-6 6-2 6-3 | Hard |
| 2026-02-02 | Cleveland | Round of 16 | Stefan Kozlov | Raphael Perot | 7-6(5) 3-6 6-3 | Hard |
| 2026-02-02 | Cleveland | Quarterfinals | Keegan Smith | Stefan Kozlov | 6-3 6-2 | Hard |
| 2026-01-27 | San Diego | Round of 32 | Sho Shimabukuro | Stefan Kozlov | 6-2 4-6 7-6(5) | Hard |
| 2026-01-19 | Oeiras | Round of 32 | Stefan Kozlov | Alexis Galarneau | 7-6(2) 2-6 6-1 | Hard |
| 2026-01-19 | Oeiras | Round of 16 | Francesco Passaro | Stefan Kozlov | 6-3 1-6 6-1 | Hard |
| 2026-01-19 | Oeiras | 2nd Round Qualifying | Stefan Kozlov | Mikhail Kukushkin | 6-4 6-2 | Hard |
| 2026-01-19 | Oeiras | 1st Round Qualifying | Stefan Kozlov | Robert Strombachs | 6-3 5-0 RET | Hard |
| 2026-01-12 | Glasgow | Round of 32 | Harry Wendelken | Stefan Kozlov | 6-1 3-6 6-4 | Hard |
| 2026-01-05 | Nottingham | Round of 32 | Stefan Kozlov | Tyler Zink | 6-4 6-1 | Hard |
| 2026-01-05 | Nottingham | Round of 16 | Stefan Kozlov | Mathys Erhard | 6-2 6-4 | Hard |
| 2026-01-05 | Nottingham | Quarterfinals | Toby Samuel | Stefan Kozlov | 7-6(1) 6-4 | Hard |
| 2025-11-24 | Bogota#3041 | Round of 32 | Stefan Kozlov | Juan Bautista Torres | 6-0 4-6 6-3 | Clay |
| 2025-11-24 | Bogota#3041 | Round of 16 | Stefan Kozlov | David Jorda Sanchis | 6-4 6-4 | Clay |
| 2025-11-24 | Bogota#3041 | Quarter-Finals | Juan Sebastian Gomez | Stefan Kozlov | 4-6 6-4 7-5 | Clay |
| 2025-11-10 | Champaign | Semi-Finals | Stefan Kozlov | Cedrik Marcel Stebe | 6-0 4-0 RET | Hard |
| 2025-11-10 | Champaign | Round of 32 | Stefan Kozlov | Leo Borg | 6-1 6-0 | Hard |
| 2025-11-10 | Champaign | Round of 16 | Stefan Kozlov | Tyler Zink | 6-3 6-3 | Hard |
| 2025-11-10 | Champaign | Quarter-Finals | Stefan Kozlov | Darwin Blanch | 6-2 6(7)-7 6-3 | Hard |
| 2025-11-10 | Champaign | Finals | Stefan Kozlov | Murphy Cassone | 7-6(3) 7-5 | Hard |
| 2025-11-03 | Knoxville | Round of 32 | Stefan Kozlov | Dominique Rolland | 7-6(1) 2-6 6-1 | Hard |
| 2025-11-03 | Knoxville | Round of 16 | Jay Clarke | Stefan Kozlov | 6-2 2-6 6-3 | Hard |
| 2025-08-04 | Chicago | 2nd Round Qualifying | Tsung Hao Huang | Stefan Kozlov | 1-6 7-5 6-2 | Hard |
| 2025-08-04 | Chicago | 1st Round Qualifying | Stefan Kozlov | Ramkumar Ramanathan | 6-1 6(4)-7 5-3 RET | Hard |
| 2025-07-07 | Newport | Round of 32 | Mitchell Krueger | Stefan Kozlov | 6-1 3-6 6-1 | Grass |
| 2025-06-02 | Tyler | 2nd Round Qualifying | Alvin Nicholas Tudorica | Stefan Kozlov | 7-5 6-3 | Hard |
| 2025-06-02 | Tyler | 1st Round Qualifying | Stefan Kozlov | Daniel Milavsky | 6-3 6(7)-7 6-3 | Hard |
| 2025-05-26 | Little Rock | Round of 32 | Stefan Kozlov | Aziz Dougaz | 5-7 6-3 6-2 | Hard |
| 2025-05-26 | Little Rock | Round of 16 | Andy Andrade | Stefan Kozlov | 6-1 4-6 7-5 | Hard |
| 2025-05-26 | Little Rock | 2nd Round Qualifying | Stefan Kozlov | Elmar Ejupovic | 6-4 7-6(5) | Hard |
| 2025-05-26 | Little Rock | 1st Round Qualifying | Stefan Kozlov | Kiranpal Pannu | 7-6(3) 2-6 6-2 | Hard |
| 2025-05-12 | M25 Xalapa | F | Stefan Kozlov | Santiago Fa Rodriguez Taverna | 6-7 6-4 6-4 | Hard |
Aliases
6
atp
- S. Kozlov
- Stefan Kozlov (ke64)
atp_short
- S. Kozlov (ke64)
itf
- Stefan Kozlov (800335858)
sackmann
- Stefan Kozlov (111578)
variant
- S Kozlov