United States
| Age | 27 (01-02-1998) |
| Country | United States |
| Birthplace | Skopje, Macedonia |
| Height | 6'0" (183 cm) |
| Weight | 174 lbs (79 kg) |
| Plays | Right-Handed |
| Backhand | Two-Handed |
| Favorite Surface |  Grass 38% |
| Coach | Andrei Kozlov, Nicolas Todero |
| Turned Pro | 2013 |
| Player Status | Active |
Match Stats
Hard
Clay
Grass
Indoor
All
Service Stats
| Aces / Game | 0.19 | 17 / 90 |
| DFs / Game | 0.24 | 22 / 90 |
| 1st Serve % | 59.2% | 352 / 595 |
| 1st Serve Win % | 63.4% | 223 / 352 |
| 2nd Serve Win % | 46.1% | 112 / 243 |
| Service Points Win % | 56.3% | 335 / 595 |
Return Stats
| Opponent Aces / Game | 0.33 | 30 / 90 |
| Opponent Double Faults / Game | 0.43 | 39 / 90 |
| Opponent 1st Serve % | 60.6% | 378 / 624 |
| 1st Return Win % | 34.7% | 131 / 378 |
| 2nd Return Win % | 56.9% | 140 / 246 |
| Return Points Win % | 43.4% | 271 / 624 |
Break Points (Serve)
| Break Points Saved Per Game | 0.40 | 36 / 90 |
| Break Points Faced Per Game | 0.77 | 69 / 90 |
| Break Points Save % | 52.2% | 36 / 69 |
| Service Hold % | 63.3% | 57 / 90 |
Break Points (Rtn)
| Break Points Won Per Game | 0.34 | 31 / 90 |
| Opponent Break Points Per Game | 0.86 | 77 / 90 |
| BP Won % | 40.3% | 31 / 77 |
| Opp Hold % | 65.6% | 59 / 90 |
Stefan Kozlov Past Matches
 | Abierto Mexicano Telcel - Acapulco | |||||
24 Feb 2025 QF |  | 6 2 6 4 | L |  | H2H 0-0 | |
23 Feb 2025 Q1 | | 6 1 6 4 | W | | H2H 0-0 | |
| Delray Beach Open - Delray Beach | |||||
08 Feb 2025 Q1 | | 6 3 6 0 | L | | H2H 0-0 | |
 | Cleveland Challenger | |||||
01 Feb 2025 QF | | 6 1 6 3 | L | | H2H 1-0 | |
Stefan Kozlov Surface Summary
| year | All | hard | clay | indoor | grass |
| 2025 | 5-4 | 1-2 | 0-0 | 4-2 | 0-0 |
| 2024 | 37-19 | 16-9 | 17-8 | 4-2 | 0-0 |
| 2023 | 6-12 | 1-6 | 0-0 | 5-6 | 0-0 |
| 2022 | 21-34 | 14-18 | 0-5 | 4-5 | 3-6 |
| 2021 | 41-15 | 20-12 | 5-2 | 16-1 | 0-0 |
| 2020 | 13-13 | 7-8 | 0-0 | 6-5 | 0-0 |
| 2019 | 21-18 | 13-9 | 4-4 | 4-5 | 0-0 |
| 2018 | 14-26 | 5-12 | 7-6 | 1-4 | 1-4 |
| 2017 | 31-28 | 15-13 | 8-8 | 3-2 | 5-5 |
| 2016 | 58-32 | 28-16 | 10-6 | 16-5 | 4-5 |
| 2015 | 44-27 | 15-12 | 10-5 | 17-8 | 2-2 |
| 2014 | 17-15 | 15-10 | 2-3 | 0-2 | 0-0 |
| 2013 | 13-8 | 3-2 | 10-5 | 0-0 | 0-1 |
| 2012 | 2-1 | 2-1 | 0-0 | 0-0 | 0-0 |
Stefan Kozlov Performance Breakdown
Tournament Level Breakdown
| Grand Slam | 31.0% | 9 / 20 |
| Masters | 23.5% | 4 / 13 |
| Main Tour | 38.8% | 26 / 41 |
| Cups | 0.0% | 0 / 0 |
| Challengers | 57.8% | 188 / 137 |
| Futures | 70.1% | 96 / 41 |
Opponent Rank Breakdown
| Vs No.1 | 0.0% | 0 / 1 |
| Vs Top.5 | 0.0% | 0 / 2 |
| Vs Top.10 | 0.0% | 0 / 4 |
| Vs Top.20 | 0.0% | 0 / 6 |
| Vs Top.50 | 17.6% | 3 / 14 |
| Vs Top.100 | 30.4% | 17 / 39 |
Surface Breakdown
| Overall | 56.2% | 323 / 252 |
| Hard | 54.4% | 155 / 130 |
| Clay | 58.4% | 73 / 52 |
| Indoor | 63.0% | 80 / 47 |
| Grass | 39.5% | 15 / 23 |
Round Breakdown
| Final | 50.0% | 9 / 9 |
| Semi-Final | 63.3% | 19 / 11 |
| Quarter-Final | 47.6% | 30 / 33 |
| Third | 50.0% | 3 / 3 |
| Second | 61.7% | 66 / 41 |
| First | 55.7% | 107 / 85 |
| Qualifying Final | 61.4% | 27 / 17 |
| Qualifying R2 | 54.5% | 12 / 10 |
| Qualifying R1 | 53.8% | 50 / 43 |
Stefan Kozlov Titles/Finals/Semis
Title
Finals
Stefan Kozlov interesting Heads to Heads
 Stefan Kozlov | Wins VIEW H2H |  Steve Johnson | ||
Stefan Kozlov | Loss VIEW H2H |  Donald Young | ||
Stefan Kozlov | Loss VIEW H2H |  Sam Querrey | ||
Stefan Kozlov | Loss VIEW H2H |  Guido Pella | ||
Stefan Kozlov | Loss VIEW H2H |  Ivo Karlovic | ||
Stefan Kozlov | Loss VIEW H2H |  Tim Smyczek | ||
Stefan Kozlov | Loss VIEW H2H |  Rafael Nadal | ||
Stefan Kozlov | Wins VIEW H2H |  Benjamin Becker | ||
Stefan Kozlov | Loss VIEW H2H |  Michal Przysiezny | ||
Stefan Kozlov | Wins VIEW H2H |  Dustin Brown | ||
Stefan Kozlov | Loss VIEW H2H |  Adrian Menendez-Maceiras | ||
Stefan Kozlov | Loss VIEW H2H |  Marin Cilic | ||
Upcoming Tennis Predictions & Head to Heads
Milic Vrbensky Prediction H2H (0-0)
Mazza Perfetti Prediction H2H (0-0)
Added Chidekh Prediction H2H (0-2)
Arnaboldi Kopriva Prediction H2H (0-0)
Bielinskyi Ivanovski Prediction H2H (0-0)
Crisostomo Juarez Prediction H2H (0-0)
Johannus Monday Ronald Hohmann Prediction H2H (0-0)
 ATP Rankings | |||
|---|---|---|---|
| 1 | 11330 PTS | ||
| 2 | 7945 PTS | ||
| 3 | 6910 PTS | ||
| 4 | 4900 PTS | ||
| 5 | 3860 PTS | ||
| 6 | 3855 PTS | ||
| 7 | 3800 PTS | ||
| 8 | 3680 PTS | ||
| 9 | 3440 PTS | ||
| 10 | 3405 PTS | ||
 Live Tennis Events | |||
|---|---|---|---|
 | Miami Open - Miami United States | ||
 | Concepcion Challenger Chile | ||
 | Girona Challenger Spain | ||
 | Morelia Challenger Mexico | ||
 | Naples Challenger Italy | ||
| M15 Foggia Italy | ||
 | M15 Nonthaburi Thailand | ||
 | M15 Tsukuba Japan | ||
| M25 Calabasas United States | ||
 | M25 Lujan Argentina | ||
 | M25 Saint-Dizier France | ||
 | M25 Santo Domingo Dominican Republic | ||
| M25 Tarragona Spain | ||
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