H2H data updated: 2026-09-01 00:00 UTC

Stefan Kozlov vs J.J. Wolf H2H: 0-1

J.J. Wolf holds a 1–0 lead over Stefan Kozlov in their ATP head-to-head. Across 1 main-draw meeting, J.J. Wolf leads 1–0 on hard courts. Most recently, J.J. Wolf won the 2022 San Diego round of 32 6-2 7-6(6).

Want to explore more matchups? Advanced rivalry search lets you browse current and historical rivalries, unbeaten records, or every matchup for a player.

Stefan Kozlov
United States Age 28 Right-Handed 183 cm / 6'0"
H2H
0 – 1
1 main draw meetings
J.J. Wolf
United States Age 27 Right-Handed 183 cm / 6'0"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
J.J. Wolf #73 6-2 7-6(6) Stefan Kozlov #108 Match data Sep 22, 2022* R32 San Diego ATP 250 Hard

Estimated match date where the exact historical date is unavailable. Arrows show an edition's recorded category and documented modern equivalent; unresolved editions keep their recorded category. Asterisked totals include editions mapped from documented historical predecessor categories. Mapping details.

Career Comparison

Player Current Peak Pts Elo W L Win % GS 1000 including documented historical predecessor categories Finals 500 including documented historical predecessor categories 250 including documented historical predecessor categories Titles
Stefan Kozlov #297 #103 558 1,673 9 26 25.7% 0 0 0 0 0 0
J.J. Wolf #253 #39 1,025 1,849 45 55 45.0% 0 0 0 0 0 0

Career Progression by Age

Seasons are aligned by the age each player spent most of that calendar year. GS and Titles are cumulative career totals through that season.

Age Stefan Kozlov J.J. Wolf
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
15 2013 0–1 0.0% #1083 1,489 0 0 — — — — — — —
16 2014 0–1 0.0% #467 1,453 0 0 — — — — — — —
17 2015 0–2 0.0% #351 1,420 0 0 — — — — — — —
18 2016 3–2 60.0% #116 1,481 0 0 — — — — — — —
19 2017 2–9 18.2% #167 1,549 0 0 — — — — — — —
20 2018 0–1 0.0% #316 1,528 0 0 — — — — — — —
21 — — — — — — — 2020 2–3 40.0% #127 1,605 0 0
22 2020 0–1 0.0% #371 1,514 0 0 2021 0–3 0.0% #174 1,557 0 0
23 2021 0–1 0.0% #159 1,550 0 0 2022 15–13 53.6% #66 1,799 0 0
24 2022 4–8 33.3% #198 1,529 0 0 2023 26–25 51.0% #53 1,780 0 0
25 — — — — — — — 2024 2–9 18.2% #261 1,629 0 0
27 — — — — — — — 2026 0–2 0.0% #253 1,604 0 0

Surface Results by Age

Seasons are aligned by the age each player spent most of that calendar year. Results cover completed main-draw matches. Bold green marks the higher win percentage when both players have at least 5 matches on that surface at the aligned age.

Age Stefan Kozlov J.J. Wolf
Yr HardClayGrass Yr HardClayGrass
W L M Win % W L M Win % W L M Win % W L M Win % W L M Win % W L M Win %
15 2013 — — — — — — — — 0 1 1 0.0% — — — — — — — — — — — — —
16 2014 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — —
17 2015 0 2 2 0.0% — — — — — — — — — — — — — — — — — — — — —
18 2016 — — — — — — — — 3 2 5 60.0% — — — — — — — — — — — — —
19 2017 0 6 6 0.0% — — — — 2 3 5 40.0% — — — — — — — — — — — — —
20 2018 — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — —
21 — — — — — — — — — — — — — 2020 2 3 5 40.0% — — — — — — — —
22 2020 0 1 1 0.0% — — — — — — — — 2021 0 3 3 0.0% — — — — — — — —
23 2021 0 1 1 0.0% — — — — — — — — 2022 14 12 26 53.8% 1 1 2 50.0% — — — —
24 2022 4 6 10 40.0% — — — — 0 2 2 0.0% 2023 18 17 35 51.4% 5 5 10 50.0% 3 3 6 50.0%
25 — — — — — — — — — — — — — 2024 1 6 7 14.3% 1 3 4 25.0% — — — —
27 — — — — — — — — — — — — — 2026 0 2 2 0.0% — — — — — — — —
Career — 4 17 21 19.0% 0 1 1 0.0% 5 8 13 38.5% — 35 43 78 44.9% 7 9 16 43.8% 3 3 6 50.0%

Performance Progression by Age

Seasons are aligned by the age each player spent most of that calendar year. Sample is shown as matches with detailed serve and return statistics / total main draw matches. Bold green marks the stronger value when both stat samples contain at least 5 matches; lower is better for DFs/M.

Age Stefan Kozlov J.J. Wolf
Yr Sample Aces/M DFs/M 1st Sv% 1st Pts% 2nd Pts% BP Saved% BP Conv% Svc Pts% Ret Pts% Yr Sample Aces/M DFs/M 1st Sv% 1st Pts% 2nd Pts% BP Saved% BP Conv% Svc Pts% Ret Pts%
15 2013 1/1 4.0 3.0 43.5% 74.5% 42.6% 62.5% 44.4% 56.5% 36.0% — —/— — — — — — — — — —
16 2014 1/1 2.0 4.0 56.4% 61.3% 50.0% 63.6% 16.7% 56.4% 35.5% — —/— — — — — — — — — —
17 2015 2/2 0.5 3.0 44.3% 48.1% 35.6% 27.8% 67.5% 41.3% 42.2% — —/— — — — — — — — — —
18 2016 5/5 4.2 4.8 55.8% 67.8% 41.9% 67.2% 40.4% 56.9% 38.4% — —/— — — — — — — — — —
19 2017 11/11 3.6 4.1 58.0% 65.2% 44.1% 53.2% 35.0% 56.5% 32.9% — —/— — — — — — — — — —
20 2018 1/1 2.0 5.0 50.9% 65.5% 35.7% 20.0% 50.0% 50.9% 28.0% — —/— — — — — — — — — —
21 — —/— — — — — — — — — — 2020 5/5 7.2 5.4 54.5% 71.7% 44.5% 47.6% 45.0% 59.1% 34.6%
22 2020 1/1 1.0 5.0 68.5% 54.1% 57.1% 36.4% 50.0% 55.1% 31.7% 2021 3/3 8.0 3.7 56.0% 75.0% 53.1% 56.7% 15.9% 65.3% 29.5%
23 2021 1/1 1.0 1.0 76.4% 54.8% 61.5% 42.9% 25.0% 56.4% 32.7% 2022 28/28 6.8 3.1 59.6% 69.8% 47.6% 56.9% 41.0% 61.1% 35.6%
24 2022 12/12 1.6 4.8 72.4% 60.0% 43.6% 59.6% 35.7% 55.2% 36.0% 2023 51/51 7.2 3.0 57.1% 74.1% 52.6% 61.5% 48.7% 64.8% 35.1%
25 — —/— — — — — — — — — — 2024 11/11 5.2 3.0 55.4% 65.5% 43.9% 49.3% 19.3% 56.0% 30.8%
27 — —/— — — — — — — — — — 2026 2/2 4.0 3.0 61.0% 65.5% 40.0% 35.5% 42.5% 56.0% 31.0%
Career — 35/35 2.6 4.3 62.0% 62.4% 43.9% 54.8% 38.2% 55.1% 35.3% — 100/100 6.9 3.2 57.5% 71.7% 49.6% 57.5% 42.0% 62.4% 34.5%

Advanced Statistics Comparison by Age

Seasons are aligned by the age each player spent most of that calendar year. Metrics are precomputed from eligible main-draw results; point-stat values use the available detailed sample. Bold green marks the stronger value when both underlying samples are sufficient. Lower is better for Schedule because a negative value means a tougher schedule. Career Schedule is normalized per 100 matches.

Age Stefan Kozlov J.J. Wolf
Yr Elo P+ Serve+ Return+ PD TPW% Hard Elo Clay Elo Grass Elo Set Win % Set Margin Dec. Set Tiebreak Pressure+ Schedule Yr Elo P+ Serve+ Return+ PD TPW% Hard Elo Clay Elo Grass Elo Set Win % Set Margin Dec. Set Tiebreak Pressure+ Schedule
15 2013 1490 100.2 -4.35 +1.56 0.828 46.1% — — — 33.3% -1.33 0–1 1–0 — +0.13 — — — — — — — — — — — — — — — —
16 2014 1454 100.0 +0.67 0.00 0.813 45.3% — — — 0.0% -3.00 — — — -0.04 — — — — — — — — — — — — — — — —
17 2015 1420 101.3 -5.76 -0.97 0.718 41.8% — — — 0.0% -3.50 — — — +0.21 — — — — — — — — — — — — — — — —
18 2016 1481 107.5 -3.43 +1.33 0.891 48.1% — — +119 54.5% +0.09 1–0 — — -0.03 2017 1490 99.6 — — — — — — — — — — — — —
19 2017 1550 118.7 -5.47 -0.25 0.757 44.9% -74 — +123 21.7% -1.70 2–1 (67%) 0–3 (0%) — +0.21 2018 1507 107.1 — — — — — — — — — — — — —
20 2018 1528 106.2 +0.19 -0.20 0.570 40.2% — — — 0.0% -3.50 — — — -0.08 2019 1505 105.3 — — — — — — — — — — — — —
21 2019 1514 100.9 — — — — — — — — — — — — — 2020 1605 126.4 -1.37 +1.12 0.846 46.8% +38 — — 42.9% -0.50 — 0–1 — -0.12
22 2020 1514 104.1 -1.24 +2.90 0.705 43.9% — — — 33.3% -2.33 0–1 1–0 — -0.06 2021 1557 116.1 -3.14 +1.22 0.850 47.5% +19 — — 33.3% -1.22 0–3 (0%) 2–0 — -0.03
23 2021 1550 110.6 +2.69 +0.42 0.749 44.9% — — — 0.0% -3.00 — — — +0.04 2022 1799 143.6 -1.16 +0.24 0.914 48.5% +5 — — 51.5% -0.12 5–3 (63%) 5–5 (50%) — -0.89
24 2022 1530 118.4 -4.38 +0.86 0.803 45.9% +20 — — 32.3% -1.48 2–0 1–1 — -0.54 2023 1780 143.3 +0.70 -0.62 0.999 50.1% -5 -194 -134 52.8% +0.18 5–8 (38%) 11–8 (58%) — +1.36
25 2023 1458 91.9 — — — — — — — — — — — — — 2024 1629 108.6 -4.15 -2.83 0.700 43.4% +1 -34 — 18.2% -2.41 1–0 0–1 — +0.47
26 2024 1433 92.7 — — — — — — — — — — — — — 2025 1608 — — — — — — — — — — — — — —
27 2025 1436 101.4 — — — — — — — — — — — — — 2026 1604 108.4 -2.88 +0.19 0.705 44.5% — — — 16.7% -1.83 — 0–1 — -0.02
28 2026 1418 97.5 — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
Career — 1674 113.0 -4.10 +0.48 0.784 45.4% -15 — +121 28.4% -1.58 5–3 (63%) 3–4 (43%) 104.8 -0.46 — 1850 138.2 -0.64 -0.46 0.916 48.6% +3 -148 -134 47.2% -0.27 11–14 (44%) 18–16 (53%) 102.5 +0.77

Career Rivalries

Each player's five most-played main-draw opponents. The current matchup is highlighted when it appears in a player's top five.