H2H data updated: 2026-09-03 00:00 UTC

Stefan Kozlov vs Martin Klizan H2H: 0-1

Martin Klizan holds a 1–0 lead over Stefan Kozlov in their ATP head-to-head. Across 1 main-draw meeting, Martin Klizan leads 1–0 on hard courts. Most recently, Martin Klizan won the 2014 Valencia round of 32 6-3 6-3.

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Stefan Kozlov
United States Age 28 Right-Handed 183 cm / 6'0"
H2H
0 – 1
1 main draw meetings
Martin Klizan
Slovakia Age 37 Left-Handed 191 cm / 6'3"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Martin Klizan #37 6-3 6-3 Stefan Kozlov #441 Match data Oct 23, 2014* R32 Valencia ATP 500 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
Martin Klizan #831 #24 1,445 1,979 128 147 46.5% 0 0 0 2 4 6

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 Martin Klizan
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 2007 1–1 50.0% #395 1,524 0 0
18 2016 3–2 60.0% #116 1,481 0 0 — — — — — — —
19 2017 2–9 18.2% #167 1,549 0 0 2009 0–1 0.0% #234 1,542 0 0
20 2018 0–1 0.0% #316 1,528 0 0 2010 1–2 33.3% #155 1,607 0 0
21 — — — — — — — 2011 0–2 0.0% #117 1,600 0 0
22 2020 0–1 0.0% #371 1,514 0 0 2012 16–14 53.3% #30 1,792 0 1
23 2021 0–1 0.0% #159 1,550 0 0 2013 12–24 33.3% #108 1,690 0 1
24 2022 4–8 33.3% #198 1,529 0 0 2014 23–16 59.0% #34 1,930 0 2
25 — — — — — — — 2015 24–27 47.1% #43 1,797 0 3
26 — — — — — — — 2016 14–15 48.3% #35 1,752 0 5
27 — — — — — — — 2017 10–15 40.0% #141 1,757 0 5
28 — — — — — — — 2018 18–9 66.7% #41 1,917 0 6
29 — — — — — — — 2019 9–18 33.3% #141 1,701 0 6
30 — — — — — — — 2020 0–2 0.0% #151 1,648 0 6
35 — — — — — — — 2025 0–1 0.0% #835 1,555 0 6

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 Martin Klizan
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% — — — — — — — — 2007 1 1 2 50.0% — — — — — — — —
18 2016 — — — — — — — — 3 2 5 60.0% — — — — — — — — — — — — —
19 2017 0 6 6 0.0% — — — — 2 3 5 40.0% 2009 — — — — 0 1 1 0.0% — — — —
20 2018 — — — — 0 1 1 0.0% — — — — 2010 0 1 1 0.0% 1 1 2 50.0% — — — —
21 — — — — — — — — — — — — — 2011 0 1 1 0.0% 0 1 1 0.0% — — — —
22 2020 0 1 1 0.0% — — — — — — — — 2012 10 6 16 62.5% 5 5 10 50.0% 1 3 4 25.0%
23 2021 0 1 1 0.0% — — — — — — — — 2013 4 13 17 23.5% 7 9 16 43.8% 1 2 3 33.3%
24 2022 4 6 10 40.0% — — — — 0 2 2 0.0% 2014 8 8 16 50.0% 13 6 19 68.4% 2 2 4 50.0%
25 — — — — — — — — — — — — — 2015 12 14 26 46.2% 12 11 23 52.2% 0 2 2 0.0%
26 — — — — — — — — — — — — — 2016 8 12 20 40.0% 6 2 8 75.0% 0 1 1 0.0%
27 — — — — — — — — — — — — — 2017 5 8 13 38.5% 5 5 10 50.0% 0 2 2 0.0%
28 — — — — — — — — — — — — — 2018 6 5 11 54.5% 12 4 16 75.0% — — — —
29 — — — — — — — — — — — — — 2019 4 9 13 30.8% 5 8 13 38.5% 0 1 1 0.0%
30 — — — — — — — — — — — — — 2020 0 1 1 0.0% 0 1 1 0.0% — — — —
35 — — — — — — — — — — — — — 2025 — — — — 0 1 1 0.0% — — — —
Career — 4 17 21 19.0% 0 1 1 0.0% 5 8 13 38.5% — 58 79 137 42.3% 66 55 121 54.5% 4 13 17 23.5%

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 271/275 of Martin Klizan'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 Martin Klizan
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% 2007 2/2 4.5 5.0 50.7% 64.2% 50.8% 61.7% 45.0% 58.5% 41.6%
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% 2009 1/1 2.0 3.0 44.4% 64.3% 37.1% 44.4% 30.0% 49.2% 43.2%
20 2018 1/1 2.0 5.0 50.9% 65.5% 35.7% 20.0% 50.0% 50.9% 28.0% 2010 3/3 4.7 7.3 48.1% 67.9% 41.9% 64.6% 41.1% 54.6% 35.4%
21 — —/— — — — — — — — — — 2011 2/2 1.5 5.5 60.6% 52.6% 35.0% 22.7% 29.2% 45.7% 35.2%
22 2020 1/1 1.0 5.0 68.5% 54.1% 57.1% 36.4% 50.0% 55.1% 31.7% 2012 29/30 3.9 3.5 56.1% 71.1% 50.5% 56.3% 48.2% 62.1% 41.4%
23 2021 1/1 1.0 1.0 76.4% 54.8% 61.5% 42.9% 25.0% 56.4% 32.7% 2013 36/36 6.0 3.9 54.7% 67.3% 48.8% 60.3% 40.6% 58.8% 36.4%
24 2022 12/12 1.6 4.8 72.4% 60.0% 43.6% 59.6% 35.7% 55.2% 36.0% 2014 36/39 5.7 3.2 56.9% 73.3% 52.4% 61.3% 44.3% 63.9% 37.9%
25 — —/— — — — — — — — — — 2015 51/51 4.8 3.6 57.5% 68.9% 48.4% 56.2% 42.0% 60.3% 34.4%
26 — —/— — — — — — — — — — 2016 29/29 4.6 4.4 58.0% 69.6% 49.4% 58.1% 49.6% 60.7% 38.5%
27 — —/— — — — — — — — — — 2017 25/25 3.3 3.3 64.7% 67.0% 50.6% 58.0% 40.2% 61.2% 36.6%
28 — —/— — — — — — — — — — 2018 27/27 4.5 2.4 62.1% 70.2% 55.5% 59.1% 54.5% 64.5% 37.8%
29 — —/— — — — — — — — — — 2019 27/27 4.3 4.5 58.1% 67.0% 47.9% 55.1% 48.2% 58.9% 35.1%
30 — —/— — — — — — — — — — 2020 2/2 5.0 1.5 55.6% 68.0% 47.9% 51.4% 32.5% 59.0% 34.8%
35 — —/— — — — — — — — — — 2025 1/1 0.0 4.0 64.0% 72.0% 42.0% 56.0% 60.0% 62.0% 29.0%
Career — 35/35 2.6 4.3 62.0% 62.4% 43.9% 54.8% 38.2% 55.1% 35.3% — 271/275 4.7 3.7 58.0% 69.2% 50.0% 57.8% 45.2% 60.9% 37.0%

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 Martin Klizan
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 1524 104.9 -2.40 -0.79 1.001 50.8% — — — 50.0% +0.50 — 0–1 — +0.04
18 2016 1481 107.5 -3.43 +1.33 0.891 48.1% — — +119 54.5% +0.09 1–0 — — -0.03 2008 1506 98.1 — — — — — — — — — — — — —
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 1543 104.5 -2.83 -2.96 0.851 46.0% — — — 0.0% -2.00 — — — +0.11
20 2018 1528 106.2 +0.19 -0.20 0.570 40.2% — — — 0.0% -3.50 — — — -0.08 2010 1607 113.5 +0.26 +1.44 0.780 45.9% — — — 33.3% -0.78 1–1 — — -0.14
21 2019 1514 100.9 — — — — — — — — — — — — — 2011 1601 108.6 -3.98 +3.39 0.648 40.3% — — — 0.0% -3.25 — — — -0.28
22 2020 1514 104.1 -1.24 +2.90 0.705 43.9% — — — 33.3% -2.33 0–1 1–0 — -0.06 2012 1793 136.2 -0.83 +2.99 1.092 51.5% -45 -158 -236 52.6% +0.10 4–5 (44%) 3–7 (30%) — +0.80
23 2021 1550 110.6 +2.69 +0.42 0.749 44.9% — — — 0.0% -3.00 — — — +0.04 2013 1690 141.7 -2.90 -0.83 0.884 48.1% -55 +13 -130 39.3% -0.74 4–11 (27%) 6–8 (43%) — +0.17
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 1930 145.3 +0.98 +1.95 1.050 51.1% -137 +27 -329 56.4% +0.30 10–4 (71%) 11–8 (58%) — -2.11
25 2023 1458 91.9 — — — — — — — — — — — — — 2015 1798 145.6 -2.85 -1.50 0.865 47.5% -11 +44 — 45.3% -0.62 11–6 (65%) 17–5 (77%) — -0.15
26 2024 1433 92.7 — — — — — — — — — — — — — 2016 1753 151.0 -1.88 +1.38 0.979 50.0% +2 +114 — 52.2% +0.12 6–7 (46%) 4–6 (40%) — +1.22
27 2025 1436 101.4 — — — — — — — — — — — — — 2017 1757 144.6 -1.26 +0.29 0.943 49.2% -12 +78 — 47.5% +0.03 4–5 (44%) 6–9 (40%) — -0.38
28 2026 1418 97.5 — — — — — — — — — — — — — 2018 1918 149.4 +0.58 +1.54 1.064 51.4% -96 +77 — 58.2% +0.43 8–2 (80%) 5–3 (63%) — -2.08
29 — — — — — — — — — — — — — — — — 2019 1702 134.3 -4.15 -1.03 0.853 47.6% +16 +145 — 37.1% -0.73 4–5 (44%) 7–7 (50%) — -0.18
30 — — — — — — — — — — — — — — — — 2020 1649 111.4 -0.19 -1.33 0.847 45.8% — — — 20.0% -2.00 0–1 0–1 — -0.18
31 — — — — — — — — — — — — — — — — 2021 1541 88.8 — — — — — — — — — — — — —
35 — — — — — — — — — — — — — — — — 2025 1556 101.9 -0.23 -0.93 0.763 47.0% — — — 33.3% -0.67 0–1 — — +0.01
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 — 1980 146.1 -1.61 +0.42 0.947 49.3% -39 +43 -241 47.5% -0.22 52–48 (52%) 59–55 (52%) 103.7 -1.16

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.