J.J. Wolf vs Stefan KozlovPrediction, Head-to-Head Results, and Stats
J.J. Wolf and Stefan Kozlov have met 9 times since 2019; J.J. Wolf leads 5–4. Their first meeting came at Columbus in 2019 on hard. On hard courts Wolf leads 5–4. 1 of their meetings has been a final, with Wolf leading those 1–0. Across all meetings Wolf has taken 12 sets to Kozlov's 8. Their most recent meeting: J.J. Wolf won at Cleveland Challenger (2025).
Spread & Straight-Sets Form
Completed best-of-3 matches · Last 12 months
| Indicator | Wolf | Kozlov | ||
|---|---|---|---|---|
| Indicator | J.J. Wolf | Stefan Kozlov | ||
| Wins in straight sets | 63% | 19/30 | 55% | 16/29 |
| Wins a set when losing | 40% | 4/10 | 48% | 13/27 |
| Goes to a deciding set | 38% | 15/40 | 46% | 26/56 |
| Covers −1.5 sets as favorite | 43% | 13/30 | 42% | 13/31 |
| Covers +1.5 sets as underdog | 80% | 4/5 | 68% | 15/22 |
| Tiebreak sets won | 50% | 7/14 | 41% | 7/17 |
| Wins after taking set 1 | 93% | 25/27 | 87% | 27/31 |
| Wins 2-0 after taking set 1 | 70% | 19/27 | 52% | 16/31 |
Colored rows are higher-is-better: green above 50%, red below. Favorite/underdog set by book odds; cover rows count only matches with odds on record. Head-to-head: 7 of 9 completed meetings ended in straight sets (Wolf 5, Kozlov 2).
Style Matchup
Playing styles and historical archetype record
Wolf
👑 The Complete Package
Kozlov
🪃 Counterpuncher
Matchup analysis
The 👑 The Complete Package archetype wins about 53% vs 🪃 Counterpuncher across 1,744 matches in our dataset: a stylistic lean toward J.J. Wolf.
The Complete Package players often use elite serve & return and high bp conversion to pressure the counterpuncher's elite bp conversion.
Previous meetings
9 career meetings, newest first
Jan 31, 2025
Cleveland Challenger
H Hard · Quarterfinals
Jul 5, 2024
Bloomfield Hills Challenger
H Hard · Quarterfinals
Sep 19, 2022
San Diego Open - San Diego
H Hard · 1st Round
Nov 20, 2021
Champaign Challenger
H Hard · Semifinals
Nov 6, 2021
Charlottesville Challenger
H Hard · Semifinals
Oct 31, 2021
Las Vegas Challenger
H Hard · Final
Sep 25, 2021
Columbus Challenger
H Hard · Semifinals
Nov 12, 2019
Champaign
H Hard · Quarterfinals
Jan 8, 2019
Columbus
H Hard · Round of 64
Prop Research
Hit rates on common betting markets · Last 90 days
| Outcome | Wolf | Kozlov | ||
|---|---|---|---|---|
| Outcome | J.J. Wolf | Stefan Kozlov | ||
| 1 or more | 100% | 17/17 | 71% | 5/7 |
| 3 or more | 94% | 16/17 | 29% | 2/7 |
| 5 or more | 65% | 11/17 | 0% | 0/7 |
| 10 or more | 18% | 3/17 | 0% | 0/7 |
| 15 or more | 0% | 0/17 | 0% | 0/7 |
| 20 or more | 0% | 0/17 | 0% | 0/7 |
Player ROI
Hypothetical if you put 1u on each player to win every one of their matches · Last 90 days
| Metric | Wolf | Kozlov |
|---|---|---|
| W-L | 12–6 | 2–7 |
| Avg odds | 1.75 | 2.20 |
| ROI % | +9.8% | -60.9% |
| Units P/L | +1.76u | -5.48u |
Small sample: ROI stabilizes with more matches; fewer than 10 in the window is noisy.
Travel
Last 30 days
| Metric | Wolf | Kozlov |
|---|---|---|
| Countries | 1 | 1 |
| Events | 3 | 3 |
| Matches | 5 | 4 |
| Distance | 2,418 mi · 3,891 km | 2,418 mi · 3,891 km |
| Route | USA | USA |
Host country from each tournament in the last 30 days, including the current event even when a player arrived on a bye. Route is the order of countries visited; consecutive stops in the same country are shown once. Distance is the great-circle total between host cities, shown only when every stop in the window is geocoded. A rough fatigue signal, not a headline stat.
Common opponents
Results vs. opponents both players faced · Last 12 months
Wolf has a higher win rate against shared opponents (60% vs Kozlov's 20%).
| Opponent | Wolf | Kozlov |
|---|---|---|
| Darwin Blanch | L 64 67 16 | L 36 62 67 |
| Colton Smith | W 76 63 | L 46 26 |
| Michael Mmoh | L 26 26 | L 57 26 |
| James Duckworth | L 57 67 | L 36 26 |
| Sho Shimabukuro | W 63 36 75 | L 26 64 67 |
| Jay Dylan Hara Friend | W 63 64 | L 26 64 36 |
| Tyler Zink | W 63 63 | W 64 61 |
| Jacob Fearnley | L 67 64 36 | L 63 36 26 |
| Andres Martin | W 36 63 64 | L 26 26 |
| Raphael Perot | W 63 62 | W 63 61 |
Recent Form
Last five matches per player
Dylan Dietrich
Columbus Challenger · 1st Round
Sep 29
Darwin Blanch
San Diego 2 Challenger · 1st Round
Sep 22
Michael Mmoh
Tiburon Challenger · Semifinals
Sep 20
Sebastian Gorzny
Tiburon Challenger · Quarterfinals
Sep 18
Braden Shick
Tiburon Challenger · 2nd Round
Sep 16
Luciano Emanuel Ambrogi
Tiburon Challenger · 1st Round
Sep 14
Alexander Bublik
U.S. Open - New York · 1st Round
Aug 31
James Duckworth
Cincinnati Open - Cincinnati · 1st Round
Aug 14
Mitchell Krueger
Columbus Challenger · 2nd Round
Oct 1
James Kent Trotter
Columbus Challenger · 1st Round
Sep 29
Colton Smith
San Diego 2 Challenger · 1st Round
Sep 22
Darwin Blanch
Tiburon Challenger · 1st Round
Sep 15
Harry Wendelken
Brownsburg Challenger · 2nd Round
Aug 13
Aidan Mayo
Brownsburg Challenger · 1st Round
Aug 12
Zachary Svajda
Citi Open - Washington · 1st Round Qualifying
Jul 25
Alan Magadan
Bloomfield Hills Challenger · 1st Round
Jul 21
Rivalry momentum
Cumulative head-to-head lead over time
Win rate
Matches, sets and games won · Last 12 months · 41–56 matches
| Metric | Wolf | Kozlov |
|---|---|---|
| Matches won | 73% | 52% |
| Sets won | 66% | 51% |
| Games won | 55% | 51% |
Record by tier
Head-to-head record by tournament tier
| Stage | Wolf | Kozlov |
|---|---|---|
| Finals | 1 | 0 |
| ATP 250 | 1 | 0 |
| ATP Challenger Tour | 4 | 4 |
By surface
Head-to-head record per surface
| Surface | Wolf | Kozlov |
|---|---|---|
| Hard | 5 | 4 |
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