Stefan Kozlov: Ranking, Schedule & Stats
Stefan Kozlov is a professional tennis player from United States, born 1 February 1998. The American competes on the ATP Tour and plays right-handed. Kozlov stands 183 cm (6 ft 0 in) tall and weighs 77 kg (170 lb). The American's career numbers favour clay (54%, 52-44) over hard (52%, 185-172) and grass (44%, 17-22). The American was born in Skopje and is based in Pembroke Pines.
This page tracks Stefan Kozlov's upcoming schedule, latest results, recent form and surface record, with each match linking through to a detailed head-to-head and pre-match analysis. Scores update live as matches are played.
Current form
2026 season2026Kozlov has won 15 of the last 30 first sets
Kozlov has won 6 of 14 deciding sets
Kozlov has won 58% of matches on clay
Kozlov has won 3 of the last 10 matches
Ratings & strengths
Umpiry ratings · updated dailyHow a player performs in the biggest moments, across 116 matches in our records. About
Surface performanceSurfaces
2026 seasonLast 12 monthsCareer · 2013 – todayGrass is the clear edge: 2 losses in 7 matches this season.
Grass is the clear edge: 2 losses in 7 matches over the last 12 months.
Win rates are close across the career: clay 54%, hard 52%.
Ranking & projection
ATP ranking · not EloATP · not EloRecent results
Last 5Beyond today · rivals & careerBeyond today
Rivals
Most meetings
Most-played rivals. The record is Kozlov's wins–losses across all matches we have, qualifying excluded.
Season
Current seasonResults
Season breakdown
2026 · by level, surface, opponent, sets2026Career · 2013 – today
Career overview
2013 – todayTitles & finals
10 finals · 5 titles · 5 lostNo ATP tour-level final on record for Stefan Kozlov — either they have not reached one, or we do not have it in our data.
Hide finals ▴
More career statistics
Career serve & return
Absolute totals across the 496 matches we have on record. Green is Kozlov, grey is the same stat by the players they faced.
Aces
| Kozlov | 1,573 |
|---|---|
| Opponents | 2,114 |
Double faults
| Kozlov | 2,286 |
|---|---|
| Opponents | 1,848 |
1st serve in
| Kozlov | 61% 25,098 / 41,149 |
|---|---|
| Opponents | 61% 25,609 / 41,999 |
1st-serve points won
| Kozlov | 66% 16,648 / 25,098 |
|---|---|
| Opponents | 66% 16,824 / 25,609 |
Break points converted
| Kozlov | 42% 1,955 / 4,627 |
|---|---|
| Opponents | 42% 1,831 / 4,309 |
Break points saved
| Kozlov | 58% 2,478 / 4,309 |
|---|---|
| Opponents | 58% 2,672 / 4,627 |
1st-serve points won by season
| Season | Kozlov | Opponents |
|---|---|---|
| 2026 | 67% | 67% |
| 2025 | 67% | 62% |
| 2024 | 65% | 63% |
| 2023 | 64% | 67% |
| 2022 | 65% | 70% |
| 2021 | 68% | 66% |
| 2020 | 65% | 64% |
| 2019 | 66% | 64% |
| 2018 | 64% | 66% |
| 2017 | 66% | 67% |
| 2016 | 69% | 66% |
| 2015 | 65% | 64% |
| 2014 | 65% | 72% |
| Career | 66% | 66% |
Counted from the match statistics we hold, season by season — the cards above are career totals from our data provider, so the two can differ by a few tenths. Seasons with fewer than three matches on record are left out.
Career win–loss by level
| Level | W–L | Win % | Titles |
|---|---|---|---|
| Grand Slam | 1–3 | 25% | 0 |
| ATP Masters 1000 | 0–2 | 0% | 0 |
| ATP 500 | 1–8 | 11% | 0 |
| ATP 250 | 3–12 | 20% | 0 |
| Other tour level | 4–3 | 57% | — |
| Tour level | 9–28 | 24% | 0 |
| Challenger | 163–142 | 53% | 5 |
| ITF / Futures | 78–34 | 70% | 5 |
Challenger and ITF matches are shown in grey and are not part of the tour-level total.
Season breakdown
Wins and losses in one season, split by round reached, surface, tournament level and opponent ranking band.
2026 season · 23–24 · W–L 49% · 47 matches
Round played
| Qualifying | 10–7 (59%) |
|---|---|
| R32 | 9–10 (47%) |
| R16 | 3–7 (30%) |
Surface
| Hard | 7–13 (35%) |
|---|---|
| Hard (indoor) | 8–5 (62%) |
| Clay | 5–5 (50%) |
| Grass | 3–1 (75%) |
Tournament level
| Main tour | 0–2 (0%) |
|---|---|
| Challenger | 23–22 (51%) |
Opponent ranked
| vs top 100 | 0–2 (0%) |
|---|
Rounds are the round each match was played in, not a ladder: a player enters a 32-draw straight in R32, and team events (United Cup, Davis Cup) are not played through a draw at all — those have their own row. Ranking bands use the opponent's ranking on match day and are cumulative: top 100 includes top 10.
Surface record by season
Each cell is one season on one surface: the number is wins–losses, the colour is the win rate. Carpet is counted as indoor hard.
| Season | Hard | Clay | Grass | I.hard | Total |
|---|---|---|---|---|---|
| 2026 | 7–13 | 5–5 | 3–1 | 8–5 | 23–24 |
| 2025 | 12–6 | 6–2 | 0–1 | 10–3 | 28–12 |
| 2024 | 16–9 | 17–8 | · | 4–2 | 37–19 |
| 2023 | 1–6 | · | · | 5–6 | 6–12 |
| 2022 | 14–18 | 0–5 | 3–6 | 4–5 | 21–34 |
| 2021 | 20–12 | 5–2 | · | 16–1 | 41–15 |
| 2020 | 7–8 | · | · | 6–5 | 13–13 |
| 2019 | 14–9 | 4–4 | · | 4–5 | 22–18 |
| 2018 | 4–12 | 7–6 | 1–4 | 1–4 | 13–26 |
| 2017 | 15–14 | 8–8 | 5–5 | 3–2 | 31–29 |
| 2016 | 28–15 | 10–6 | 4–5 | 16–5 | 58–31 |
| 2015 | 15–12 | 10–5 | 2–2 | 17–8 | 44–27 |
| 2014 | 15–10 | 2–3 | · | 0–2 | 17–15 |
| 2013 | 3–2 | 10–5 | 0–1 | · | 13–8 |
| 2012 | 2–1 | · | · | · | 2–1 |
| Career | 173–147 54% | 84–59 59% | 18–25 42% | 94–53 64% | 369–284 57% |
Record at one tournament
Every edition entered: year, best round reached, wins and losses. Most recent first.
Charlottesville CH · Editions 7 · Record 14–6 · Titles 1
Tournament page →| Year | Best round | W | L |
|---|---|---|---|
| 2023 | R32 | 2 | 1 |
| 2022 | R16 | 1 | 1 |
| 2021 | Title | 5 | 0 |
| 2018 | Qualifying | 1 | 1 |
| 2017 | SF | 3 | 1 |
| 2015 | QF | 2 | 1 |
| 2014 | R32 | 0 | 1 |
Season statistics
Each stat is stored as a value–count pair, so seasons can be added together and the rate is always value ÷ count.
2015–2022 · 33 games summed across the range
| Stat | Value | Count | Rate |
|---|---|---|---|
| Aces | 85 | 350 service games | 0.2 / game |
| Double faults | 143 | 350 service games | 0.4 / game |
| 1st serve in | 1,463 | 2,279 serve points | 64% |
| 1st-serve points won | 919 | 1,463 1st serves in | 63% |
| 2nd-serve points won | 358 | 816 2nd serves | 44% |
| Service points won | 1,277 | 2,279 serve points | 56% |
| Return points lost | 799 | 2,206 return points | 36% |
| Break points saved | 163 | 295 faced | 55% |
Value is what happened (aces hit, points won), count is how often it could (service games, points played). Adding seasons adds both — the rate is never averaged from percentages.
More on Umpiry · discovery
More players from United States
All →Frequently asked · Stefan KozlovFrequently asked
How tall is Stefan Kozlov?
Stefan Kozlov is 183 cm (6 ft 0 in) tall.
How much does Stefan Kozlov weigh?
Stefan Kozlov weighs 77 kg (170 lb), according to Wikidata records.
When was Stefan Kozlov born?
Stefan Kozlov was born on 1 February 1998 (28 years old).
Where is Stefan Kozlov from?
Stefan Kozlov is from United States, born in Skopje on 1 February 1998.
Is Stefan Kozlov right or left-handed?
Stefan Kozlov plays right-handed.
Who is Stefan Kozlov's coach?
Stefan Kozlov is coached by Andrei Kozlov.
How good is Stefan Kozlov on clay?
Stefan Kozlov's clay-court record stands at 52-44, a 54% win rate.
How good is Stefan Kozlov on hard?
Stefan Kozlov has won 52% of hard-court matches (185-172).
How good is Stefan Kozlov on grass?
On grass, Stefan Kozlov has compiled a 17-22 record (44% wins).
Cite this
Stefan Kozlov is ranked No. 290 in the ATP singles rankings with 195 points. Umpiry, "Stefan Kozlov: Ranking, Schedule & Stats", https://umpiry.com/players/stefan-kozlov-usa?utm_source=cite (as of 1 October 2026).