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

Martin Klizan vs John Isner H2H: 1-1

Martin Klizan and John Isner are tied 1–1 in their ATP head-to-head. Across 2 main-draw meetings, they are tied 1–1 on hard courts. Most recently, Martin Klizan won the 2014 Australian Open first round 6-2 7-6(6) RET.

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Martin Klizan
Slovakia Age 37 Left-Handed 191 cm / 6'3"
H2H
1 – 1
2 main draw meetings
John Isner
USA Age 41 Right-Handed 208 cm / 6'10"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Martin Klizan #106 6-2 7-6(6) (ret.) John Isner #13 Match data Jan 15, 2014* R128 Australian Open Grand Slam Hard
John Isner #10 4-6 6-3 7-5 Martin Klizan #50 Match data Aug 22, 2012* R32 Winston-Salem Open 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
Martin Klizan #831 #24 1,445 1,979 128 147 46.5% 0 0 0 2 4 6
John Isner #660 #8 3,720 2,068 470 294 61.5% 0 1 0 0 15 16

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 Martin Klizan John Isner
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
17 2007 1–1 50.0% #395 1,524 0 0 — — — — — — —
19 2009 0–1 0.0% #234 1,542 0 0 — — — — — — —
20 2010 1–2 33.3% #155 1,607 0 0 — — — — — — —
21 2011 0–2 0.0% #117 1,600 0 0 — — — — — — —
22 2012 16–14 53.3% #30 1,792 0 1 2007 8–5 61.5% #106 1,656 0 0
23 2013 12–24 33.3% #108 1,690 0 1 2008 11–19 36.7% #144 1,607 0 0
24 2014 23–16 59.0% #34 1,930 0 2 2009 27–18 60.0% #34 1,829 0 0
25 2015 24–27 47.1% #43 1,797 0 3 2010 38–20 65.5% #19 1,884 0 1
26 2016 14–15 48.3% #35 1,752 0 5 2011 34–19 64.2% #18 2,020 0 3
27 2017 10–15 40.0% #141 1,757 0 5 2012 41–19 68.3% #14 1,977 0 5
28 2018 18–9 66.7% #41 1,917 0 6 2013 38–22 63.3% #14 1,984 0 7
29 2019 9–18 33.3% #141 1,701 0 6 2014 37–21 63.8% #19 1,935 0 9
30 2020 0–2 0.0% #151 1,648 0 6 2015 45–23 66.2% #11 2,028 0 10
31 — — — — — — — 2016 30–20 60.0% #19 2,021 0 10
32 — — — — — — — 2017 36–21 63.2% #17 1,985 0 12
33 — — — — — — — 2018 32–22 59.3% #10 1,958 0 14
34 — — — — — — — 2019 29–17 63.0% #19 1,922 0 15
35 2025 0–1 0.0% #835 1,555 0 6 2020 10–7 58.8% #25 1,845 0 15
36 — — — — — — — 2021 23–11 67.6% #24 1,945 0 16
37 — — — — — — — 2022 22–16 57.9% #41 1,925 0 16
38 — — — — — — — 2023 9–14 39.1% #172 1,711 0 16

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 Martin Klizan John Isner
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 %
17 2007 1 1 2 50.0% — — — — — — — — — — — — — — — — — — — — —
19 2009 — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — —
20 2010 0 1 1 0.0% 1 1 2 50.0% — — — — — — — — — — — — — — — — —
21 2011 0 1 1 0.0% 0 1 1 0.0% — — — — — — — — — — — — — — — — —
22 2012 10 6 16 62.5% 5 5 10 50.0% 1 3 4 25.0% 2007 8 4 12 66.7% — — — — 0 1 1 0.0%
23 2013 4 13 17 23.5% 7 9 16 43.8% 1 2 3 33.3% 2008 9 12 21 42.9% 1 3 4 25.0% 1 4 5 20.0%
24 2014 8 8 16 50.0% 13 6 19 68.4% 2 2 4 50.0% 2009 25 17 42 59.5% 2 1 3 66.7% — — — —
25 2015 12 14 26 46.2% 12 11 23 52.2% 0 2 2 0.0% 2010 29 13 42 69.0% 8 6 14 57.1% 1 1 2 50.0%
26 2016 8 12 20 40.0% 6 2 8 75.0% 0 1 1 0.0% 2011 26 13 39 66.7% 2 5 7 28.6% 6 1 7 85.7%
27 2017 5 8 13 38.5% 5 5 10 50.0% 0 2 2 0.0% 2012 27 12 39 69.2% 6 5 11 54.5% 8 2 10 80.0%
28 2018 6 5 11 54.5% 12 4 16 75.0% — — — — 2013 26 14 40 65.0% 8 5 13 61.5% 4 3 7 57.1%
29 2019 4 9 13 30.8% 5 8 13 38.5% 0 1 1 0.0% 2014 27 14 41 65.9% 6 5 11 54.5% 4 2 6 66.7%
30 2020 0 1 1 0.0% 0 1 1 0.0% — — — — 2015 31 14 45 68.9% 10 6 16 62.5% 4 3 7 57.1%
31 — — — — — — — — — — — — — 2016 22 13 35 62.9% 5 5 10 50.0% 3 2 5 60.0%
32 — — — — — — — — — — — — — 2017 23 14 37 62.2% 7 4 11 63.6% 6 3 9 66.7%
33 — — — — — — — — — — — — — 2018 20 16 36 55.6% 7 5 12 58.3% 5 1 6 83.3%
34 — — — — — — — — — — — — — 2019 24 16 40 60.0% — — — — 5 1 6 83.3%
35 2025 — — — — 0 1 1 0.0% — — — — 2020 9 6 15 60.0% 1 1 2 50.0% — — — —
36 — — — — — — — — — — — — — 2021 18 8 26 69.2% 5 2 7 71.4% 0 1 1 0.0%
37 — — — — — — — — — — — — — 2022 11 10 21 52.4% 7 4 11 63.6% 4 2 6 66.7%
38 — — — — — — — — — — — — — 2023 6 10 16 37.5% 0 2 2 0.0% 3 2 5 60.0%
Career — 58 79 137 42.3% 66 55 121 54.5% 4 13 17 23.5% — 341 206 547 62.3% 75 59 134 56.0% 54 29 83 65.1%

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 271/275 of Martin Klizan's and 756/764 of John Isner'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 Martin Klizan John Isner
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%
17 2007 2/2 4.5 5.0 50.7% 64.2% 50.8% 61.7% 45.0% 58.5% 41.6% — —/— — — — — — — — — —
19 2009 1/1 2.0 3.0 44.4% 64.3% 37.1% 44.4% 30.0% 49.2% 43.2% — —/— — — — — — — — — —
20 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 2012 29/30 3.9 3.5 56.1% 71.1% 50.5% 56.3% 48.2% 62.1% 41.4% 2007 13/13 19.6 3.1 67.2% 78.2% 59.4% 65.5% 19.8% 71.9% 26.6%
23 2013 36/36 6.0 3.9 54.7% 67.3% 48.8% 60.3% 40.6% 58.8% 36.4% 2008 29/30 15.0 3.4 66.9% 77.1% 52.3% 60.0% 26.1% 68.8% 27.4%
24 2014 36/39 5.7 3.2 56.9% 73.3% 52.4% 61.3% 44.3% 63.9% 37.9% 2009 45/45 14.5 2.5 67.1% 75.0% 57.4% 65.9% 29.5% 69.1% 30.0%
25 2015 51/51 4.8 3.6 57.5% 68.9% 48.4% 56.2% 42.0% 60.3% 34.4% 2010 58/58 17.8 2.3 69.1% 76.5% 55.9% 68.0% 39.3% 70.1% 29.9%
26 2016 29/29 4.6 4.4 58.0% 69.6% 49.4% 58.1% 49.6% 60.7% 38.5% 2011 53/53 15.2 2.8 69.2% 78.0% 55.6% 62.5% 40.1% 71.2% 31.5%
27 2017 25/25 3.3 3.3 64.7% 67.0% 50.6% 58.0% 40.2% 61.2% 36.6% 2012 56/60 16.7 2.2 67.9% 78.2% 57.0% 72.2% 33.2% 71.6% 31.1%
28 2018 27/27 4.5 2.4 62.1% 70.2% 55.5% 59.1% 54.5% 64.5% 37.8% 2013 60/60 16.3 1.7 67.7% 79.4% 57.8% 66.5% 33.7% 72.2% 31.1%
29 2019 27/27 4.3 4.5 58.1% 67.0% 47.9% 55.1% 48.2% 58.9% 35.1% 2014 57/58 17.4 1.8 67.8% 79.1% 57.8% 73.0% 27.3% 72.1% 30.2%
30 2020 2/2 5.0 1.5 55.6% 68.0% 47.9% 51.4% 32.5% 59.0% 34.8% 2015 68/68 18.5 1.8 70.3% 80.2% 58.6% 74.8% 37.5% 73.8% 29.6%
31 — —/— — — — — — — — — — 2016 50/50 23.2 2.7 69.2% 82.4% 55.3% 68.3% 35.9% 73.9% 30.7%
32 — —/— — — — — — — — — — 2017 57/57 19.7 2.2 70.6% 80.6% 56.5% 63.6% 41.2% 73.5% 29.1%
33 — —/— — — — — — — — — — 2018 54/54 22.4 2.4 69.1% 81.3% 56.7% 70.1% 30.6% 73.7% 29.7%
34 — —/— — — — — — — — — — 2019 46/46 21.8 1.7 71.0% 81.4% 58.6% 70.1% 34.2% 74.7% 29.8%
35 2025 1/1 0.0 4.0 64.0% 72.0% 42.0% 56.0% 60.0% 62.0% 29.0% 2020 17/17 21.9 3.5 71.5% 78.6% 54.9% 84.1% 25.0% 72.2% 28.8%
36 — —/— — — — — — — — — — 2021 33/34 20.6 2.1 68.5% 79.0% 55.9% 62.7% 34.5% 71.8% 28.4%
37 — —/— — — — — — — — — — 2022 37/38 22.6 2.8 68.8% 80.3% 54.1% 64.9% 36.6% 72.1% 27.7%
38 — —/— — — — — — — — — — 2023 23/23 20.9 2.9 67.7% 79.7% 57.4% 72.2% 18.8% 72.3% 28.0%
Career — 271/275 4.7 3.7 58.0% 69.2% 50.0% 57.8% 45.2% 60.9% 37.0% — 756/764 18.8 2.3 68.9% 79.2% 56.7% 68.4% 33.7% 72.2% 29.8%

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 Martin Klizan John Isner
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
17 2007 1524 104.9 -2.40 -0.79 1.001 50.8% — — — 50.0% +0.50 — 0–1 — +0.04 — — — — — — — — — — — — — — — —
18 2008 1506 98.1 — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
19 2009 1543 104.5 -2.83 -2.96 0.851 46.0% — — — 0.0% -2.00 — — — +0.11 — — — — — — — — — — — — — — — —
20 2010 1607 113.5 +0.26 +1.44 0.780 45.9% — — — 33.3% -0.78 1–1 — — -0.14 — — — — — — — — — — — — — — — —
21 2011 1601 108.6 -3.98 +3.39 0.648 40.3% — — — 0.0% -3.25 — — — -0.28 — — — — — — — — — — — — — — — —
22 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 2007 1656 138.0 +5.43 -3.75 0.947 49.4% +37 — — 54.1% -0.19 5–1 (83%) 12–7 (63%) — +0.01
23 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 2008 1608 128.0 +4.14 -6.69 0.881 48.3% +39 -96 -116 41.0% -0.51 4–8 (33%) 13–12 (52%) — +0.16
24 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 2009 1830 145.6 +4.72 -4.63 0.972 50.0% +1 -280 — 57.0% +0.23 12–6 (67%) 26–12 (68%) — +0.93
25 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 2010 1885 154.2 +5.86 -4.84 1.002 50.5% +41 -194 — 58.8% +0.34 19–9 (68%) 32–16 (67%) — +2.28
26 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 2011 2020 160.4 +7.13 -3.98 1.097 51.5% +30 -361 -297 61.6% +0.53 11–11 (50%) 32–20 (62%) — +1.83
27 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 2012 1978 157.8 +7.12 -4.36 1.092 51.3% +43 -260 -71 62.7% +0.43 15–10 (60%) 38–18 (68%) — +3.35
28 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 2013 1985 159.0 +7.64 -3.71 1.119 51.3% +52 -198 -94 59.5% +0.36 18–11 (62%) 36–17 (68%) — +3.48
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 2014 1935 157.9 +7.20 -4.42 1.079 50.8% +50 -99 -27 61.8% +0.44 12–6 (67%) 41–21 (66%) — +3.24
30 2020 1649 111.4 -0.19 -1.33 0.847 45.8% — — — 20.0% -2.00 0–1 0–1 — -0.18 2015 2029 168.0 +8.71 -4.22 1.132 51.6% +54 -121 -120 62.7% +0.57 12–9 (57%) 39–25 (61%) — +3.80
31 2021 1541 88.8 — — — — — — — — — — — — — 2016 2021 163.0 +8.76 -3.60 1.179 51.8% +44 -140 -79 58.6% +0.48 9–10 (47%) 31–30 (51%) — +1.41
32 — — — — — — — — — — — — — — — — 2017 1986 158.3 +8.00 -5.60 1.094 51.2% +14 -91 -60 60.0% +0.42 11–9 (55%) 40–24 (63%) — +3.24
33 — — — — — — — — — — — — — — — — 2018 1959 158.8 +8.37 -4.32 1.129 51.3% -23 -61 +77 57.0% +0.42 14–11 (56%) 37–32 (54%) — +2.48
34 — — — — — — — — — — — — — — — — 2019 1922 154.7 +8.16 -3.97 1.178 51.7% -6 — +115 61.2% +0.47 8–7 (53%) 29–23 (56%) — +3.19
35 2025 1556 101.9 -0.23 -0.93 0.763 47.0% — — — 33.3% -0.67 0–1 — — +0.01 2020 1846 134.4 +4.91 -4.34 1.035 50.7% +22 — — 60.9% +0.50 3–3 (50%) 14–7 (67%) — +1.74
36 — — — — — — — — — — — — — — — — 2021 1945 152.3 +6.93 -5.43 1.006 50.2% 0 +9 — 62.5% +0.27 10–5 (67%) 21–9 (70%) — +0.90
37 — — — — — — — — — — — — — — — — 2022 1926 145.5 +6.21 -5.79 0.996 49.8% -21 +13 +80 55.1% -0.02 11–8 (58%) 30–17 (64%) — +1.11
38 — — — — — — — — — — — — — — — — 2023 1711 125.8 +5.40 -5.66 1.012 49.9% +36 — +244 45.3% -0.14 3–6 (33%) 11–17 (39%) — +1.74
Career — 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 — 2068 162.0 +7.10 -4.58 1.071 50.9% +25 -137 -39 58.7% +0.34 177–130 (58%) 482–307 (61%) 111.1 +4.58

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.