Profile
Stefan Kozlov
Stats
| Current Rank | 433 |
| Best Rank | 103 (17 Jul 2022) |
| Titles | 9  |
| Grand Slams | 0 |
| Main Tour | 0 |
| Masters | 0 |
| Tour Finals | 0 |
| Challengers | 5 |
| Futures | 4 |
Recent Form
L
W
L
W
L
L
W
W
L
W
| Age | 27(31 Jan 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 |
| Prize Money | $371,951 |
Performance Breakdown
Surface Breakdown
W/L
| Overall | 56.2% | 324 / 253 |
| Hard | 54.4% | 156 / 131 |
| Clay | 58.4% | 73 / 52 |
| Indoor | 63.0% | 80 / 47 |
| Grass | 39.5% | 15 / 23 |
Round Breakdown
W/L
| Final | 50.0% | 9 / 9 |
| Semi-final | 63.3% | 19 / 11 |
| Quarter-final | 47.6% | 30 / 33 |
| 3rd Round | 50.0% | 3 / 3 |
| 2nd Round | 61.1% | 66 / 42 |
| 1st Round | 56.0% | 108 / 85 |
| Qualies Final | 61.4% | 27 / 17 |
| Qualies Round 2 | 54.5% | 12 / 10 |
| Qualies Round 1 | 53.8% | 50 / 43 |
Tournament Level Breakdown
W/L
| 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% | 189 / 138 |
| Futures | 70.1% | 96 / 41 |
Opponent Rank Breakdown
W/L
| 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 |
| opponent | score | h2h | |||
 Cuernavaca Challenger 30 Mar 25 | |||||
| R2 |  Stats | 7-5 3-6 6-2 | H2H | ||
| R1 | Stats | 4-6 6-4 6-2 | H2H | ||
| Abierto Mexicano Telcel - Acapulco 23 Feb 25 | |||||
| QF | Stats | 6-2 6-4 | H2H | ||
| Q1 | Stats | 6-1 6-4 | H2H | ||
| Delray Beach Open - Delray Beach 09 Feb 25 | |||||
| Q1 | Stats | 6-3 6-0 | H2H | ||
 Cleveland Challenger 26 Jan 25 | |||||
| QF | Stats | 6-1 6-3 | H2H | ||
| R2 | WC | Stats | 6-2 6-3 | H2H | |
| R1 | Stats | 4-6 6-3 6-4 | H2H | ||
| Quimper Challenger 19 Jan 25 | |||||
| R1 | Stats | 6-3 7-5 | H2H | ||
| QF | Stats | 4-6 6-2 6-4 | H2H | ||
| Q1 | Stats | 6-3 6-4 | H2H | ||
| Champaign Challenger 10 Nov 24 | |||||
| R1 | Stats | 1-6 7-6(3) 6-4 | H2H | ||
| Sioux Falls Challenger 20 Oct 24 | |||||
| R2 | w/o | H2H | |||
| R1 | Stats | 7-6(3) 4-6 6-4 | H2H | ||
| Lincoln Challenger 04 Aug 24 | |||||
| R1 | Stats | 2-6 6-4 6-2 | H2H | ||
| QF | Stats | 6-3 6-1 | H2H | ||
| Q1 | Stats | 6-4 7-6(4) | H2H | ||
| Lexington Challenger 28 Jul 24 | |||||
| R1 | Stats | 6-4 3-6 6-3 | H2H | ||
| QF | Stats | 7-6(3) 0-6 7-5 | H2H | ||
| Q1 | Stats | 6-2 6-3 | H2H | ||
Match Stats
Service Stats
| Aces per Game | 0.17 | 20 / 118 |
| Double Faults Per Game | 0.27 | 32 / 118 |
| 1st Serve % | 62.1% | 479 / 771 |
| 1st Serve Win% | 64.3% | 308 / 479 |
| 2nd Serve Win% | 44.9% | 131 / 292 |
| Serve Points Win% | 56.9% | 439 / 771 |
Return Stats
| Opponent Aces / Game | 0.28 | 33 / 118 |
| Opponent Double Faults / Game | 0.35 | 42 / 118 |
| Opponent 1st Serve % | 60.6% | 486 / 802 |
| 1st Return Win % | 33.3% | 162 / 486 |
| 2nd Return Win % | 57.0% | 180 / 316 |
| Return Points Win% | 42.6% | 342 / 802 |
Break Points (Serve)
| Break Points Saved / Game | 0.35 | 41 / 118 |
| Break Points Faced / Game | 0.69 | 82 / 118 |
| Break Points Save % | 50.0% | 41 / 82 |
| Service Hold % | 65.4% | 77 / 118 |
Break Points (Return)
| Break Points Won / Game | 0.33 | 39 / 118 |
| Opponent Break Points / Game | 0.78 | 93 / 118 |
| Break Points Won % | 41.9% | 39 / 93 |
| Opponent Hold % | 67.1% | 79 / 118 |
Surface Summary
| year | sum. | hard | clay | i.hard | grass |
| 2025 | 6/5 | 2/3 | 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 |
Singles Titles/Finals
Titles
No Titles
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| 1 |  | Jannik Sinner | 9930 PTS |
| 2 |  | Carlos Alcaraz | 7720 PTS |
| 3 |  | Alexander Zverev | 7595 PTS |
| 4 | | Taylor Fritz | 5280 PTS |
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| Tennis Events This Week | |||
|---|---|---|---|
| Barcelona Open Banc Sabadell - Barcelona Spain | ||
| BMW Open - Munich Germany | ||
 | Abidjan 1 Challenger Cote d'Ivoire | ||
 | Busan Challenger Korea, Rep. | ||
 | Oeiras 4 Challenger Portugal | ||
 | San Luis Potosi Challenger Mexico | ||
| Tallahassee Challenger United States | ||
 | M15 Monastir Tunisia | ||
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