H2H data updated: 2026-09-02 00:00 UTC

Stefan Kozlov vs Jason Jung

Compare the head-to-head record, career totals, season-by-season performance, and match log for Stefan Kozlov vs Jason Jung.

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Stefan Kozlov
United States Age 28 Right-Handed 183 cm / 6'0"
H2H
0 – 0
0 main draw meetings
Jason Jung
Chinese Taipei Age 37 Right-Handed 178 cm / 5'10"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Stefan Kozlov #253 6-3 3-6 5-2 (ret.) Jason Jung #165 Match data Oct 7, 2021* Q1 Q Indian Wells Open Masters 1000 Hard

1 qualifying meeting shown in the table; qualifying is excluded from the H2H score. 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
Jason Jung #1,071 #114 500 1,668 10 22 31.2% 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 Jason Jung
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 — — — — — — —
22 2020 0–1 0.0% #371 1,514 0 0 — — — — — — —
23 2021 0–1 0.0% #159 1,550 0 0 — — — — — — —
24 2022 4–8 33.3% #198 1,529 0 0 — — — — — — —
28 — — — — — — — 2017 0–2 0.0% #239 1,465 0 0
29 — — — — — — — 2018 2–3 40.0% #121 1,531 0 0
30 — — — — — — — 2019 2–6 25.0% #127 1,559 0 0
31 — — — — — — — 2020 3–6 33.3% #132 1,600 0 0
32 — — — — — — — 2021 2–3 40.0% #178 1,537 0 0
34 — — — — — — — 2023 1–2 33.3% #244 1,528 0 0

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 Jason Jung
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 — — — — — — — — — — — — — — — —
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 — — — — — — — — — — — — — — — —
20 2018 1528 106.2 +0.19 -0.20 0.570 40.2% — — — 0.0% -3.50 — — — -0.08 — — — — — — — — — — — — — — — —
21 2019 1514 100.9 — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
22 2020 1514 104.1 -1.24 +2.90 0.705 43.9% — — — 33.3% -2.33 0–1 1–0 — -0.06 — — — — — — — — — — — — — — — —
23 2021 1550 110.6 +2.69 +0.42 0.749 44.9% — — — 0.0% -3.00 — — — +0.04 — — — — — — — — — — — — — — — —
24 2022 1530 118.4 -4.38 +0.86 0.803 45.9% +20 — — 32.3% -1.48 2–0 1–1 — -0.54 2013 1475 94.4 — — — — — — — — — — — — —
25 2023 1458 91.9 — — — — — — — — — — — — — 2014 1504 109.1 — — — — — — — — — — — — —
26 2024 1433 92.7 — — — — — — — — — — — — — 2015 1494 97.5 — — — — — — — — — — — — —
27 2025 1436 101.4 — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
28 2026 1418 97.5 — — — — — — — — — — — — — 2017 1466 99.2 -1.95 -2.05 0.694 43.9% — — — 0.0% -3.00 — — — -0.09
29 — — — — — — — — — — — — — — — — 2018 1532 109.6 -1.26 -2.42 0.819 47.0% — — +87 38.5% -0.85 1–1 0–1 — +0.05
30 — — — — — — — — — — — — — — — — 2019 1559 117.1 -2.28 -1.30 0.845 47.3% +24 — — 35.0% -0.60 1–3 (25%) 0–3 (0%) — +0.22
31 — — — — — — — — — — — — — — — — 2020 1600 135.9 -1.90 -0.10 0.889 47.4% +31 — — 37.5% -1.00 1–0 1–3 (25%) — +0.21
32 — — — — — — — — — — — — — — — — 2021 1538 108.2 -2.40 -0.54 0.941 48.6% — — +68 36.4% -0.73 1–0 1–2 (33%) — +0.76
33 — — — — — — — — — — — — — — — — 2022 1529 100.5 — — — — — — — — — — — — —
34 — — — — — — — — — — — — — — — — 2023 1528 110.8 -3.54 -0.93 0.665 41.8% -1 — — 28.6% -2.28 1–0 1–0 — +0.07
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 — 1669 117.0 -2.13 -1.03 0.837 46.8% +23 — +79 33.8% -1.06 5–4 (56%) 3–9 (25%) 99.3 +3.81

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.