Stefan Kozlov
🇺🇸USA· #294· 28y· Right-handed· ATP
30–25 · last 52 weeks
7–6 on clay in the last 52 weeks, his best surface. Down from #260 in March.
Next match
vsAidan Kim#628
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Form & record· last 52 weeks
- 30–25
- Record
- 55%
- Win rate
- Last 5
- 2–8
- Last 10
Hard 20–18Clay 7–6Grass 3–1
Record by season
| Season | Total | Hard | Clay | Grass | Indoor |
|---|---|---|---|---|---|
| All | 367–28257% | 173–14754% | 83–5958% | 18–2443% | 93–5264% |
| 2026 | 22–2349% | 7–1335% | 5–550% | 3–175%† | 7–464% |
| 2025 | 28–1270% | 12–667% | 6–275% | 0–10%† | 10–377% |
| 2024 | 37–1966% | 16–964% | 17–868% | — | 4–267% |
| 2023 | 6–1233% | 1–614% | — | — | 5–645% |
| 2022 | 21–3438% | 14–1844% | 0–50% | 3–633% | 4–544% |
† fewer than 5 matches
Recent matches
San Diego 2 Challenger · ChallengerHard · 2026
Tiburon Challenger · ChallengerHard · 2026
Brownsburg Challenger · ChallengerHard · 2026
Washington · ATP 500Hard · 2026
Bloomfield Hills Challenger · ChallengerHard · 2026
Pozoblanco Challenger · ChallengerHard · 2026
Newport Challenger · ChallengerGrass · 2026
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Level
Opponent rank
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Record · last 52 weeks
- 30–25
- Record
- 55%
- Win rate
- 23.1
- Avg games
- −0.5
- Avg spread
Surface & Conditions
| Category | W–L | Win | Spread | Games | Hold |
|---|---|---|---|---|---|
| HardOpp ~#307 | 20–18 | 53% | −0.1 | 23.4 | 74%(36) |
| ClayOpp ~#420 | 7–6 | 54% | −1.5 | 21.2 | 70%(13) |
| GrassOpp ~#271 | 3–1 | 75% | −1.0 | 26.5 | 67%(4) |
Level & Opponents
| Category | W–L | Win | Spread | Games | Hold |
|---|---|---|---|---|---|
| ATP 500Opp ~#89 | 0–2 | 0% | +7.0 | 19.0 | 50%(2) |
| ChallengerOpp ~#347 | 30–23 | 57% | −0.8 | 23.3 | 73%(51) |
| vs 51–100 | 0–2 | 0% | +7.0 | 18.0 | 53%(2) |
| vs 100+ | 27–23 | 54% | −0.6 | 23.4 | 73%(49) |
| vs Unranked | 3–0 | 100% | −5.5 | 21.5 | 73%(2) |
| vs LeftiesOpp ~#320 | 5–4 | 56% | −0.6 | 23.1 | 77%(8) |
| vs RightiesOpp ~#328 | 21–20 | 51% | −0.2 | 22.7 | 71%(40) |
Event & Format
| Category | W–L | Win | Spread | Games | Hold |
|---|---|---|---|---|---|
| First match of eventOpp ~#318 | 9–6 | 60% | −2.2 | 23.1 | 75%(15) |
| Later roundsOpp ~#328 | 10–13 | 43% | +1.3 | 23.7 | 68%(22) |
Serve
| Metric | L5 | L10 | L52 Wks |
|---|---|---|---|
| Hold % | 67% | 67% | 72% |
| Break % | 22% | 26% | 30% |
L52 Wks:Ace rate 3.7%1st-serve points won 67%Dominance ratio 1.13
53 matches with serve stats
Workload & retirements
| Situation | Value |
|---|---|
| Matches, last 7 days | 1 · 77 min |
| Matches, last 14 days | 2 · 236 min |
| Days since last match | 7 |
| Retired, last 52 Wks | 0 |
| Retired, career | 13 |
Averages exclude retirements and defaults