H2H data updated: 2026-09-04 00:00 UTC

Stefan Kozlov vs Brydan Klein

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

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Stefan Kozlov
United States Age 28 Right-Handed 183 cm / 6'0"
H2H
0 – 0
0 main draw meetings
Brydan Klein
GBR Age 36 Right-Handed 188 cm / 6'2"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Stefan Kozlov #133 6-7(9) 6-2 7-6(4) Brydan Klein #239 Match data Jul 24, 2017 Q2 Q Atlanta ATP 250 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
Brydan Klein #1,586 #169 428 1,517 3 10 23.1% 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 Brydan Klein
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 2008 0–1 0.0% #251 1,435 0 0
19 2017 2–9 18.2% #167 1,549 0 0 2009 2–3 40.0% #202 1,500 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 — — — — — — —
25 — — — — — — — 2015 0–1 0.0% #184 1,473 0 0
26 — — — — — — — 2016 0–2 0.0% #322 1,460 0 0
27 — — — — — — — 2017 1–3 25.0% #282 1,475 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 Brydan Klein
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% 2008 0 1 1 0.0% — — — — — — — —
19 2017 0 6 6 0.0% — — — — 2 3 5 40.0% 2009 1 2 3 33.3% — — — — 1 1 2 50.0%
20 2018 — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — —
22 2020 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — —
23 2021 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — —
24 2022 4 6 10 40.0% — — — — 0 2 2 0.0% — — — — — — — — — — — — —
25 — — — — — — — — — — — — — 2015 — — — — — — — — 0 1 1 0.0%
26 — — — — — — — — — — — — — 2016 — — — — — — — — 0 2 2 0.0%
27 — — — — — — — — — — — — — 2017 1 2 3 33.3% — — — — 0 1 1 0.0%
Career — 4 17 21 19.0% 0 1 1 0.0% 5 8 13 38.5% — 2 5 7 28.6% — — — — 1 5 6 16.7%

Performance Progression by Age

Seasons are aligned by the age each player spent most of that calendar year. Detailed serve and return statistics available for 35/35 of Stefan Kozlov's and 12/13 of Brydan Klein's main draw matches. 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 Brydan Klein
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% 2008 1/1 4.0 7.0 55.8% 63.5% 52.0% 54.5% 50.0% 58.4% 33.0%
19 2017 11/11 3.6 4.1 58.0% 65.2% 44.1% 53.2% 35.0% 56.5% 32.9% 2009 4/5 5.8 4.0 57.7% 69.6% 42.9% 42.6% 42.5% 58.7% 36.9%
20 2018 1/1 2.0 5.0 50.9% 65.5% 35.7% 20.0% 50.0% 50.9% 28.0% — —/— — — — — — — — — —
22 2020 1/1 1.0 5.0 68.5% 54.1% 57.1% 36.4% 50.0% 55.1% 31.7% — —/— — — — — — — — — —
23 2021 1/1 1.0 1.0 76.4% 54.8% 61.5% 42.9% 25.0% 56.4% 32.7% — —/— — — — — — — — — —
24 2022 12/12 1.6 4.8 72.4% 60.0% 43.6% 59.6% 35.7% 55.2% 36.0% — —/— — — — — — — — — —
25 — —/— — — — — — — — — — 2015 1/1 8.0 7.0 63.5% 63.8% 37.0% 54.5% — 54.1% 21.2%
26 — —/— — — — — — — — — — 2016 2/2 7.0 5.0 62.5% 69.6% 46.1% 53.6% 75.0% 60.6% 23.7%
27 — —/— — — — — — — — — — 2017 4/4 7.8 5.0 55.9% 74.7% 39.8% 50.6% 43.5% 59.6% 33.5%
Career — 35/35 2.6 4.3 62.0% 62.4% 43.9% 54.8% 38.2% 55.1% 35.3% — 12/13 6.7 5.0 58.2% 70.3% 42.7% 49.1% 45.3% 58.9% 32.0%

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 Brydan Klein
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 2007 1473 99.4 — — — — — — — — — — — — —
18 2016 1481 107.5 -3.43 +1.33 0.891 48.1% — — +119 54.5% +0.09 1–0 — — -0.03 2008 1435 96.7 +0.28 -3.70 0.793 46.7% — — — 0.0% -2.00 — — — +0.04
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 2009 1500 106.1 -1.08 -0.58 0.893 47.2% -41 — — 35.7% -0.64 1–0 0–1 — -0.13
20 2018 1528 106.2 +0.19 -0.20 0.570 40.2% — — — 0.0% -3.50 — — — -0.08 2010 1433 95.4 — — — — — — — — — — — — —
21 2019 1514 100.9 — — — — — — — — — — — — — 2011 1409 98.3 — — — — — — — — — — — — —
22 2020 1514 104.1 -1.24 +2.90 0.705 43.9% — — — 33.3% -2.33 0–1 1–0 — -0.06 2012 1419 100.0 — — — — — — — — — — — — —
23 2021 1550 110.6 +2.69 +0.42 0.749 44.9% — — — 0.0% -3.00 — — — +0.04 2013 1391 94.4 — — — — — — — — — — — — —
24 2022 1530 118.4 -4.38 +0.86 0.803 45.9% +20 — — 32.3% -1.48 2–0 1–1 — -0.54 2014 1407 101.3 — — — — — — — — — — — — —
25 2023 1458 91.9 — — — — — — — — — — — — — 2015 1473 102.7 +1.03 -2.29 0.462 38.6% — — — 0.0% -3.67 — — — -0.05
26 2024 1433 92.7 — — — — — — — — — — — — — 2016 1460 105.7 -0.03 -3.31 0.602 44.1% — — — 0.0% -1.80 — 0–1 — -0.13
27 2025 1436 101.4 — — — — — — — — — — — — — 2017 1476 105.0 -1.32 -2.66 0.829 46.4% -11 — — 27.3% -1.45 1–1 1–2 (33%) — +0.31
28 2026 1418 97.5 — — — — — — — — — — — — — 2018 1467 100.9 — — — — — — — — — — — — —
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 — 1518 102.4 -0.70 -2.13 0.777 45.6% -26 — — 22.2% -1.41 2–1 (67%) 1–4 (20%) 98.5 +0.31

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.