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

Stefan Kozlov vs Hyeon Chung

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

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Stefan Kozlov
United States Age 28 Right-Handed 183 cm / 6'0"
H2H
0 – 0
0 main draw meetings
Hyeon Chung
South Korea Age 30 Right-Handed 188 cm / 6'2"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Stefan Kozlov #115 6-2 6-2 Hyeon Chung #90 Match data Feb 27, 2017 Q1 Q Mexican Open ATP 500 Hard

1 qualifying meeting shown in the table; qualifying is excluded from the H2H score. 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
Hyeon Chung #493 #19 1,897 2,023 71 67 51.4% 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 Hyeon Chung
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 2013 0–1 0.0% — 1,494 0 0
18 2016 3–2 60.0% #116 1,481 0 0 — — — — — — —
19 2017 2–9 18.2% #167 1,549 0 0 2015 9–9 50.0% #51 1,703 0 0
20 2018 0–1 0.0% #316 1,528 0 0 2016 6–13 31.6% #104 1,657 0 0
21 — — — — — — — 2017 21–18 53.8% #58 1,870 0 0
22 2020 0–1 0.0% #371 1,514 0 0 2018 29–18 61.7% #25 1,872 0 0
23 2021 0–1 0.0% #159 1,550 0 0 2019 6–8 42.9% #128 1,851 0 0
24 2022 4–8 33.3% #198 1,529 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 Hyeon Chung
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% — — — — — — — — 2013 0 1 1 0.0% — — — — — — — —
18 2016 — — — — — — — — 3 2 5 60.0% — — — — — — — — — — — — —
19 2017 0 6 6 0.0% — — — — 2 3 5 40.0% 2015 7 6 13 53.8% 1 1 2 50.0% 1 2 3 33.3%
20 2018 — — — — 0 1 1 0.0% — — — — 2016 3 8 11 27.3% 3 5 8 37.5% — — — —
21 — — — — — — — — — — — — — 2017 11 13 24 45.8% 10 5 15 66.7% — — — —
22 2020 0 1 1 0.0% — — — — — — — — 2018 27 16 43 62.8% 2 2 4 50.0% — — — —
23 2021 0 1 1 0.0% — — — — — — — — 2019 6 8 14 42.9% — — — — — — — —
24 2022 4 6 10 40.0% — — — — 0 2 2 0.0% — — — — — — — — — — — — —
Career — 4 17 21 19.0% 0 1 1 0.0% 5 8 13 38.5% — 54 52 106 50.9% 16 13 29 55.2% 1 2 3 33.3%

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 Hyeon Chung
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% 2013 1/1 0.0 1.0 64.8% 57.1% 57.9% 40.0% 0.0% 57.4% 29.8%
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% 2015 18/18 4.3 3.6 60.9% 71.8% 55.3% 47.7% 44.8% 65.4% 40.9%
20 2018 1/1 2.0 5.0 50.9% 65.5% 35.7% 20.0% 50.0% 50.9% 28.0% 2016 19/19 2.2 1.6 66.2% 65.0% 48.7% 45.6% 42.7% 59.2% 34.7%
21 — —/— — — — — — — — — — 2017 39/39 3.6 3.3 59.8% 71.2% 48.1% 62.3% 45.6% 62.2% 39.4%
22 2020 1/1 1.0 5.0 68.5% 54.1% 57.1% 36.4% 50.0% 55.1% 31.7% 2018 47/47 3.6 2.8 61.9% 70.5% 52.5% 58.3% 44.5% 63.5% 40.4%
23 2021 1/1 1.0 1.0 76.4% 54.8% 61.5% 42.9% 25.0% 56.4% 32.7% 2019 14/14 5.3 2.4 64.0% 69.0% 50.9% 48.3% 48.3% 62.4% 32.6%
24 2022 12/12 1.6 4.8 72.4% 60.0% 43.6% 59.6% 35.7% 55.2% 36.0% — —/— — — — — — — — — —
Career — 35/35 2.6 4.3 62.0% 62.4% 43.9% 54.8% 38.2% 55.1% 35.3% — 138/138 3.6 2.8 62.0% 69.8% 51.0% 55.1% 44.7% 62.6% 38.5%

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 Hyeon Chung
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 2013 1495 95.2 -0.99 +0.22 0.700 43.2% — — — 0.0% -3.00 — — — -0.06
18 2016 1481 107.5 -3.43 +1.33 0.891 48.1% — — +119 54.5% +0.09 1–0 — — -0.03 2014 1503 97.3 — — — — — — — — — — — — —
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 2015 1704 142.7 +0.87 +3.17 1.182 52.6% -1 — -141 50.0% +0.77 2–2 (50%) 1–8 (11%) — -0.15
20 2018 1528 106.2 +0.19 -0.20 0.570 40.2% — — — 0.0% -3.50 — — — -0.08 2016 1658 136.8 -2.72 -1.03 0.852 47.2% +32 -80 — 31.1% -1.09 3–2 (60%) 1–5 (17%) — -0.93
21 2019 1514 100.9 — — — — — — — — — — — — — 2017 1871 154.5 -0.71 +3.56 1.042 50.7% -103 -35 — 53.1% +0.31 5–6 (45%) 4–3 (57%) — -2.55
22 2020 1514 104.1 -1.24 +2.90 0.705 43.9% — — — 33.3% -2.33 0–1 1–0 — -0.06 2018 1873 158.0 -0.34 +4.48 1.105 51.6% -12 -40 — 60.2% +0.64 9–7 (56%) 12–9 (57%) — +0.40
23 2021 1550 110.6 +2.69 +0.42 0.749 44.9% — — — 0.0% -3.00 — — — +0.04 2019 1851 139.7 -0.94 -1.25 0.867 47.3% -11 — — 40.9% -0.52 5–2 (71%) 1–5 (17%) — -0.42
24 2022 1530 118.4 -4.38 +0.86 0.803 45.9% +20 — — 32.3% -1.48 2–0 1–1 — -0.54 2020 1829 102.1 — — — — — — — — — — — — —
25 2023 1458 91.9 — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
26 2024 1433 92.7 — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
27 2025 1436 101.4 — — — — — — — — — — — — — 2023 1811 101.3 — — — — — — — — — — — — —
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 — 2023 153.9 -0.68 +2.68 1.031 50.4% -27 -49 -141 50.1% +0.16 24–19 (56%) 19–30 (39%) 98.4 -2.69

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.