Stefan Kozlov
Instagram profile (opens in new tab)Peak ranking
103 (Jul 18, 2022)
Elo peak
1674 (49.2%ile)
Career record
9–26 (25.7%)
Career titles
0
Prize money
$1,121,946
Recent ATP Matches full match log →
Qualifying matches are shown here but excluded from main-draw summaries and leaderboards.
| Date | Tournament | Category | Round | Surface | Opponent | Score | Result | H2H | Match |
|---|---|---|---|---|---|---|---|---|---|
| Feb 21, 2026 | Abierto Mexicano Telcel Presentado Por HSBC | ATP 500 | Q1 | Hard | Patrick Kypson | 6-7(3) 0-6 | L | H2H | Match data |
| Feb 24, 2025* | Abierto Mexicano Telcel Presentado Por HSBC | ATP 500 | Q2 | Hard | Nishesh Basavareddy | 2-6 4-6 | L | H2H | Match data |
| Feb 24, 2025* | Abierto Mexicano Telcel Presentado Por HSBC | ATP 500 | Q1 | Hard | Duarte Vale | 6-1 6-4 | W | H2H | Match data |
| Feb 10, 2025* | Delray Beach Open | ATP 250 | Q1 | Hard | Zachary Svajda | 3-6 0-6 | L | H2H | Match data |
| Apr 1, 2024 | Houston | ATP 250 | Q1 | Clay | Denis Yevseyev | 2-6 0-6 | L | H2H | Match data |
Rivals full rivalries list →
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Steve Johnson | 3 | 2 | 5 | Jul 14, 2022 | H2H |
| Sam Querrey | 0 | 2 | 2 | Aug 15, 2017 | H2H |
| Donald Young | 0 | 2 | 2 | Mar 11, 2017 | H2H |
| J.J. Wolf | 0 | 1 | 1 | Sep 22, 2022 | H2H |
| Daniil Medvedev | 0 | 1 | 1 | Aug 31, 2022 | H2H |
Career Results
| Season | Age | Type | W | L | M | Win % | Start Rank | End Rank |
|---|---|---|---|---|---|---|---|---|
| 2013 | 15 | ATP | 0 | 1 | 1 | 0.0% | 1,402 | 1,083 |
| 2014 | 16 | Qualifying | 1 | 4 | 5 | 20.0% | — | — |
| 2014 | 16 | ATP | 0 | 1 | 1 | 0.0% | 1,081 | 467 |
| 2015 | 17 | Qualifying | 0 | 2 | 2 | 0.0% | — | — |
| 2015 | 17 | ATP | 0 | 2 | 2 | 0.0% | 466 | 351 |
| 2016 | 18 | Qualifying | 1 | 5 | 6 | 16.7% | — | — |
| 2016 | 18 | ATP | 3 | 2 | 5 | 60.0% | 351 | 116 |
| 2017 | 19 | Qualifying | 9 | 6 | 15 | 60.0% | — | — |
| 2017 | 19 | ATP | 2 | 9 | 11 | 18.2% | 116 | 167 |
| 2018 | 20 | Qualifying | 5 | 7 | 12 | 41.7% | — | — |
| 2018 | 20 | ATP | 0 | 1 | 1 | 0.0% | 167 | 316 |
| 2019 | 21 | Qualifying | 0 | 1 | 1 | 0.0% | — | — |
| 2020 | 22 | Qualifying | 1 | 1 | 2 | 50.0% | — | — |
| 2020 | 22 | ATP | 0 | 1 | 1 | 0.0% | 431 | 371 |
| 2021 | 23 | Qualifying | 5 | 3 | 8 | 62.5% | — | — |
| 2021 | 23 | ATP | 0 | 1 | 1 | 0.0% | 374 | 159 |
| 2022 | 24 | Qualifying | 6 | 10 | 16 | 37.5% | — | — |
| 2022 | 24 | ATP | 4 | 8 | 12 | 33.3% | 159 | 198 |
| 2023 | 25 | Qualifying | 1 | 5 | 6 | 16.7% | — | — |
| 2024 | 26 | Qualifying | 0 | 2 | 2 | 0.0% | — | — |
| 2025 | 27 | Qualifying | 1 | 2 | 3 | 33.3% | — | — |
| 2026 | 28 | Qualifying | 0 | 1 | 1 | 0.0% | — | — |
| Career | — | 9 | 26 | 35 | 25.7% | — | — |
Career Results by Surface
| Season | Age | Type | Hard | Clay | Grass | Total | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | |||
| 2013 | 15 | ATP | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% |
| 2014 | 16 | Qualifying | 1 | 4 | 5 | 20.0% | — | — | — | — | — | — | — | — | 1 | 4 | 5 | 20.0% |
| 2014 | 16 | ATP | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% |
| 2015 | 17 | Qualifying | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — | 0 | 2 | 2 | 0.0% |
| 2015 | 17 | ATP | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — | 0 | 2 | 2 | 0.0% |
| 2016 | 18 | Qualifying | 1 | 2 | 3 | 33.3% | 0 | 1 | 1 | 0.0% | 0 | 2 | 2 | 0.0% | 1 | 5 | 6 | 16.7% |
| 2016 | 18 | ATP | — | — | — | — | — | — | — | — | 3 | 2 | 5 | 60.0% | 3 | 2 | 5 | 60.0% |
| 2017 | 19 | Qualifying | 5 | 4 | 9 | 55.6% | 1 | 1 | 2 | 50.0% | 3 | 1 | 4 | 75.0% | 9 | 6 | 15 | 60.0% |
| 2017 | 19 | ATP | 0 | 6 | 6 | 0.0% | — | — | — | — | 2 | 3 | 5 | 40.0% | 2 | 9 | 11 | 18.2% |
| 2018 | 20 | Qualifying | 2 | 5 | 7 | 28.6% | 2 | 1 | 3 | 66.7% | 1 | 1 | 2 | 50.0% | 5 | 7 | 12 | 41.7% |
| 2018 | 20 | ATP | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | 0 | 1 | 1 | 0.0% |
| 2019 | 21 | Qualifying | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% |
| 2020 | 22 | Qualifying | 1 | 1 | 2 | 50.0% | — | — | — | — | — | — | — | — | 1 | 1 | 2 | 50.0% |
| 2020 | 22 | ATP | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% |
| 2021 | 23 | Qualifying | 5 | 3 | 8 | 62.5% | — | — | — | — | — | — | — | — | 5 | 3 | 8 | 62.5% |
| 2021 | 23 | ATP | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% |
| 2022 | 24 | Qualifying | 4 | 6 | 10 | 40.0% | 0 | 1 | 1 | 0.0% | 2 | 3 | 5 | 40.0% | 6 | 10 | 16 | 37.5% |
| 2022 | 24 | ATP | 4 | 6 | 10 | 40.0% | — | — | — | — | 0 | 2 | 2 | 0.0% | 4 | 8 | 12 | 33.3% |
| 2023 | 25 | Qualifying | 1 | 5 | 6 | 16.7% | — | — | — | — | — | — | — | — | 1 | 5 | 6 | 16.7% |
| 2024 | 26 | Qualifying | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% | — | — | — | — | 0 | 2 | 2 | 0.0% |
| 2025 | 27 | Qualifying | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — | 1 | 2 | 3 | 33.3% |
| 2026 | 28 | Qualifying | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 0 | 1 | 1 | 0.0% |
| Career | — | — | 4 | 17 | 21 | 19.0% | 0 | 1 | 1 | 0.0% | 5 | 8 | 13 | 38.5% | 9 | 26 | 35 | 25.7% |
Career Results by Opponent Rank
| Season | Age | 1-10 | 11-30 | 31-100 | 100+ | Total | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | W | L | M | Win % | ||
| 2013 | 15 | 0 | 0 | — | — | 0 | 0 | — | — | 0 | 0 | — | — | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% |
| 2014 | 16 | 0 | 0 | — | — | 0 | 0 | — | — | 0 | 1 | 1 | 0.0% | 0 | 0 | — | — | 0 | 1 | 1 | 0.0% |
| 2015 | 17 | 0 | 0 | — | — | 0 | 0 | — | — | 0 | 1 | 1 | 0.0% | 0 | 1 | 1 | 0.0% | 0 | 2 | 2 | 0.0% |
| 2016 | 18 | 0 | 0 | — | — | 0 | 0 | — | — | 2 | 2 | 4 | 50.0% | 1 | 0 | 1 | 100.0% | 3 | 2 | 5 | 60.0% |
| 2017 | 19 | 0 | 1 | 1 | 0.0% | 1 | 3 | 4 | 25.0% | 1 | 1 | 2 | 50.0% | 0 | 3 | 3 | 0.0% | 2 | 8 | 10 | 20.0% |
| 2018 | 20 | 0 | 0 | — | — | 0 | 0 | — | — | 0 | 1 | 1 | 0.0% | 0 | 0 | — | — | 0 | 1 | 1 | 0.0% |
| 2020 | 22 | 0 | 0 | — | — | 0 | 0 | — | — | 0 | 1 | 1 | 0.0% | 0 | 0 | — | — | 0 | 1 | 1 | 0.0% |
| 2021 | 23 | 0 | 0 | — | — | 0 | 0 | — | — | 0 | 1 | 1 | 0.0% | 0 | 0 | — | — | 0 | 1 | 1 | 0.0% |
| 2022 | 24 | 0 | 3 | 3 | 0.0% | 0 | 1 | 1 | 0.0% | 3 | 4 | 7 | 42.9% | 1 | 0 | 1 | 100.0% | 4 | 8 | 12 | 33.3% |
| Career | 0 | 4 | 4 | 0.0% | 1 | 4 | 5 | 20.0% | 6 | 12 | 18 | 33.3% | 2 | 5 | 7 | 28.6% | 9 | 25 | 34 | 26.5% | |
Opponent ranking data available for 34/35 (97.1%) of Stefan Kozlov's ATP main draw matches.
Performance Stats
| Season | Age | Sample | Aces/M | DFs/M | 1st Sv% | 1st Sv Pts% | 2nd Sv Pts% | BP Saved% | BP Conv% | Svc Pts% | Ret Pts% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2013 | 15 | 1 | 4.0 | 3.0 | 43.5% | 74.5% | 42.6% | 62.5% | 44.4% | 56.5% | 36.0% |
| 2014 | 16 | 1 | 2.0 | 4.0 | 56.4% | 61.3% | 50.0% | 63.6% | 16.7% | 56.4% | 35.5% |
| 2015 | 17 | 2 | 0.5 | 3.0 | 44.3% | 48.1% | 35.6% | 27.8% | 67.5% | 41.3% | 42.2% |
| 2016 | 18 | 5 | 4.2 | 4.8 | 55.8% | 67.8% | 41.9% | 67.2% | 40.4% | 56.9% | 38.4% |
| 2017 | 19 | 11 | 3.6 | 4.1 | 58.0% | 65.2% | 44.1% | 53.2% | 35.0% | 56.5% | 32.9% |
| 2018 | 20 | 1 | 2.0 | 5.0 | 50.9% | 65.5% | 35.7% | 20.0% | 50.0% | 50.9% | 28.0% |
| 2020 | 22 | 1 | 1.0 | 5.0 | 68.5% | 54.1% | 57.1% | 36.4% | 50.0% | 55.1% | 31.7% |
| 2021 | 23 | 1 | 1.0 | 1.0 | 76.4% | 54.8% | 61.5% | 42.9% | 25.0% | 56.4% | 32.7% |
| 2022 | 24 | 12 | 1.6 | 4.8 | 72.4% | 60.0% | 43.6% | 59.6% | 35.7% | 55.2% | 36.0% |
| Career | 35 | 2.6 | 4.3 | 62.0% | 62.4% | 43.9% | 54.8% | 38.2% | 55.1% | 35.3% |
Advanced Stats
| Season | Age | ELO | ELO % | Hard % | Clay % | Grass % | Set Win % | Set Margin | SoS % | Deep Run % | Dec. Set W% | TB W | TB L | TB W% |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2013 | 15 | 1490 | 50 | — | — | — | 33.3% | -1.33 | 68 | 0 | — | 1 | 0 | — |
| 2014 | 16 | 1454 | 13 | — | — | — | 0.0% | -3.00 | 54 | 0 | — | 0 | 0 | — |
| 2015 | 17 | 1420 | 4 | — | — | — | 0.0% | -3.50 | 67 | 0 | — | 0 | 0 | — |
| 2016 | 18 | 1482 | 28 | — | — | 43 | 54.5% | -0.03 | 71 | 50 | — | 0 | 0 | — |
| 2017 | 19 | 1550 | 60 | 7 | — | 68 | 21.7% | -2.00 | 61 | 0 | 67 | 0 | 3 | 0 |
| 2018 | 20 | 1528 | 51 | — | — | — | 0.0% | -3.50 | 31 | 0 | — | 0 | 0 | — |
| 2019 | 21 | 1514 | 46 | — | — | — | — | — | 18 | — | — | 0 | 0 | — |
| 2020 | 22 | 1514 | 38 | — | — | — | 33.3% | -2.33 | 48 | 0 | — | 1 | 0 | — |
| 2021 | 23 | 1550 | 58 | — | — | — | 0.0% | -3.00 | 36 | 0 | — | 0 | 0 | — |
| 2022 | 24 | 1530 | 57 | 55 | — | — | 32.3% | -1.56 | 75 | 13 | — | 1 | 1 | — |
| 2023 | 25 | 1458 | 10 | — | — | — | — | — | 3 | — | — | 0 | 0 | — |
| 2024 | 26 | 1433 | 4 | — | — | — | — | — | 10 | — | — | 0 | 0 | — |
| 2025 | 27 | 1436 | 3 | — | — | — | — | — | 28 | — | — | 0 | 0 | — |
| 2026 | 28 | 1422 | 3 | — | — | — | — | — | 2 | — | — | 0 | 0 | — |
| Career | 1520 | 49 | 30 | — | 54 | 28.4% | -1.95 | 64 | 8 | 62 | 3 | 4 | 43 |
Tournament Results by Category
Results show best round reached per tournament per season.
Grand Slams
| Season | Age | AO | RG | W | USO |
|---|---|---|---|---|---|
| 2014 | 16 | — | — | — | Q2 |
| 2015 | 17 | — | — | — | Q1 |
| 2016 | 18 | — | Q1 | Q1 | Q1 |
| 2017 | 19 | Q1 | Q2 | Q2 | Q1 |
| 2018 | 20 | Q3 | Q1 | Q2 | — |
| 2019 | 21 | — | — | — | Q1 |
| 2021 | 23 | — | — | — | Q1 |
| 2022 | 24 | R64 | Q1 | R128 | R128 |
| 2023 | 25 | Q1 | — | — | — |
Masters 1000
| Season | Age | CIN | IW | MIA |
|---|---|---|---|---|
| 2014 | 16 | — | Q1 | — |
| 2015 | 17 | Q1 | — | — |
| 2016 | 18 | Q2 | — | — |
| 2017 | 19 | R64 | R128 | Q2 |
| 2018 | 20 | — | Q1 | Q1 |
| 2021 | 23 | — | Q2 | — |
| 2022 | 24 | Q1 | Q2 | Q1 |
| 2023 | 25 | — | Q1 | — |
ATP 500
| Season | Age | ACO | WAS |
|---|---|---|---|
| 2014 | 16 | — | Q1 |
| 2017 | 19 | R32 | R64 |
| 2018 | 20 | — | Q1 |
| 2021 | 23 | R32 | — |
| 2022 | 24 | R16 | R64 |
| 2025 | 27 | Q2 | — |
| 2026 | 28 | Q1 | — |
ATP 250
| Season | Age | ATL | BRI | DAL | DLB | HER | HOU | NWP | QUE | SDG | WSA | MEM | SYD | VAL |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2013 | 15 | — | — | — | — | — | — | R32 | — | — | — | — | — | — |
| 2014 | 16 | — | — | — | Q1 | — | — | — | — | — | — | — | — | R32 |
| 2015 | 17 | — | — | — | R32 | — | — | — | — | — | — | R32 | — | — |
| 2016 | 18 | — | — | — | — | QF | — | R16 | Q1 | — | — | — | — | — |
| 2017 | 19 | R32 | Q1 | — | R32 | R16 | — | R32 | R16 | — | — | — | — | — |
| 2018 | 20 | — | — | — | Q1 | — | R32 | — | — | — | — | — | — | — |
| 2020 | 22 | — | — | — | R32 | — | — | — | — | — | — | — | — | — |
| 2021 | 23 | — | — | — | Q2 | — | — | — | — | — | — | — | — | — |
| 2022 | 24 | Q1 | — | — | QF | Q1 | — | R32 | Q1 | R32 | — | — | Q1 | — |
| 2023 | 25 | — | — | Q2 | Q1 | — | — | — | — | — | Q1 | — | — | — |
| 2024 | 26 | — | — | — | Q1 | — | Q1 | — | — | — | — | — | — | — |
| 2025 | 27 | — | — | — | Q1 | — | — | — | — | — | — | — | — | — |
ATP Ranking History full ranking history →
Career high
103
Career-high date
Jul 18, 2022
First top 100
—
First top 50
—
First top 20
—
First top 10
—
Ranking History Matrix
| Season | Age | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2013 | 15 | 1394 | 1413 | 1425 | 1417 | 1451 | 1466 | 1491 | — | — | 1292 | 1084 | 1083 |
| 2014 | 16 | 1080 | 1080 | 1051 | 870 | 855 | 849 | 857 | 851 | 763 | 444 | 467 | 467 |
| 2015 | 17 | 455 | 410 | 417 | 431 | 373 | 365 | 356 | 369 | 368 | 494 | 353 | 351 |
| 2016 | 18 | 316 | 337 | 289 | 206 | 213 | 176 | 159 | 154 | 152 | 144 | 116 | 116 |
| 2017 | 19 | 122 | 115 | 122 | 147 | 144 | 126 | 132 | 141 | 144 | 135 | 167 | 167 |
| 2018 | 20 | 155 | 160 | 167 | 175 | 176 | 246 | 254 | 251 | 249 | 352 | 414 | 316 |
| 2019 | 21 | 336 | 327 | 339 | 366 | 406 | 405 | 403 | 549 | 550 | 485 | 420 | 422 |
| 2020 | 22 | 367 | 374 | 386 | 386 | — | — | — | 387 | 393 | 379 | 369 | 371 |
| 2021 | 23 | 375 | 385 | 345 | 363 | 366 | 347 | 322 | 312 | 251 | 247 | 159 | 159 |
| 2022 | 24 | 151 | 122 | 120 | 122 | 112 | 107 | 113 | 111 | 127 | 132 | 201 | 198 |
| 2023 | 25 | 239 | 354 | 371 | 368 | 363 | 387 | 389 | 396 | 441 | 655 | 779 | 787 |
| 2024 | 26 | 722 | 816 | 653 | 451 | 454 | 442 | 367 | 349 | 350 | 340 | 352 | 354 |
| 2025 | 27 | 354 | 359 | 404 | 488 | 375 | 367 | 431 | 450 | 448 | 469 | 304 | 289 |
| 2026 | 28 | 285 | 259 | 260 | 256 | 292 | 317 | 296 | — | — | — | — | — |
Similar Players
Other ATP players ranked by a composite similarity score over country, era, and peak rank.
| Player | Country | Peak Rank | Peak Elo | Grand Slams | Titles | M | W | L | Win % | Active Years | Match Log |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mitchell Krueger | USA | 135 | 1,688 | 0 | 0 | 36 | 11 | 25 | 30.6% | 2014-2025 | Match log |
| Alex Kuznetsov | USA | 120 | 1,711 | 0 | 0 | 39 | 9 | 30 | 23.1% | 2004-2016 | Match log |
| Noah Rubin | USA | 125 | 1,692 | 0 | 0 | 29 | 8 | 21 | 27.6% | 2014-2021 | Match log |
| Elias Ymer | SWE | 105 | 1,696 | 0 | 0 | 97 | 29 | 68 | 29.9% | 2013-2026 | Match log |
| Alex Bolt | AUS | 125 | 1,728 | 0 | 0 | 52 | 18 | 34 | 34.6% | 2015-2026 | Match log |
| Ramkumar Ramanathan | IND | 111 | 1,640 | 0 | 0 | 41 | 14 | 27 | 34.1% | 2014-2024 | Match log |
| Peter Polansky | CAN | 110 | 1,676 | 0 | 0 | 50 | 11 | 39 | 22.0% | 2006-2019 | Match log |
| Tim van Rijthoven | NED | 101 | 1,759 | 0 | 1 | 20 | 10 | 10 | 50.0% | 2016-2024 | Match log |
| Jason Jung | TPE | 114 | 1,668 | 0 | 0 | 32 | 10 | 22 | 31.3% | 2017-2023 | Match log |
| Giovanni Lapentti | ECU | 110 | 1,617 | 0 | 0 | 28 | 8 | 20 | 28.6% | 2003-2017 | Match log |
| Vincent Millot | FRA | 135 | 1,681 | 0 | 0 | 30 | 8 | 22 | 26.7% | 2009-2018 | Match log |
| Franko Skugor | CRO | 145 | 1,635 | 0 | 0 | 27 | 7 | 20 | 25.9% | 2008-2019 | Match log |
Frequently Asked Questions
- How old is Stefan Kozlov?
- Stefan Kozlov is 28 years old, born on February 1, 1998.
- Which country is Stefan Kozlov from?
- Stefan Kozlov is from United States.
- How tall is Stefan Kozlov?
- Stefan Kozlov is 183 cm / 6'0".
- Is Stefan Kozlov left-handed or right-handed?
- Stefan Kozlov plays right-handed.
- How many Grand Slams has Stefan Kozlov won?
- Stefan Kozlov has not won a Grand Slam title.
- How many Masters 1000 titles has Stefan Kozlov won?
- Stefan Kozlov has not won a Masters 1000 title.
- What is Stefan Kozlov's highest ATP ranking?
- Stefan Kozlov's career-high ATP singles ranking is world No. 103, first achieved on July 18, 2022.
- What is Stefan Kozlov's career win-loss record?
- Stefan Kozlov has a career ATP singles record of 9 wins and 26 losses (25.7%).
- How much career prize money has Stefan Kozlov earned?
- Stefan Kozlov has earned at least $1,121,946 in career prize money from professional tennis.
- When did Stefan Kozlov play professional tennis?
- Stefan Kozlov turned professional in 2013 and was active through 2022.
- What is Stefan Kozlov's best surface?
- Stefan Kozlov's best surface is hard court with a 19.0% win rate (4W-17L).
- Who is Stefan Kozlov's biggest rival?
- Stefan Kozlov's most frequent opponent is Steve Johnson, with a head-to-head record of 3–2 across 5 meetings.