H2H data updated: 2026-09-13 00:00 UTC

Klara Koukalova vs Ai Sugiyama H2H: 0-1

Ai Sugiyama holds a 1–0 lead over Klara Koukalova in their WTA head-to-head. Across 1 main-draw meeting, Ai Sugiyama leads 1–0 on grass. Most recently, Ai Sugiyama won the 2004 Wimbledon round of 64 6-4 6-4.

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Klara Koukalova
CZE Age 44 Right-Handed 166 cm / 5'5"
H2H
0 – 1
1 main-draw meetings
Ai Sugiyama
JPN Age 51 Right-Handed 163 cm / 5'4"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Ai Sugiyama #12 6-4 6-4 Klara Koukalova #60 Match data Jun 25, 2004* R64 Wimbledon Grand Slam Grass

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
Klara Koukalova #566 #20 1,860 1,803 275 288 48.8% 0 0 0 0 3 3
Ai Sugiyama #97 #8 2,400 1,951 416 366 53.2% 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 Klara Koukalova Ai Sugiyama
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
16 — — — — — — — 1992 1–4 20.0% #184 1,477 0 0
17 — — — — — — — 1993 3–8 27.3% #145 1,486 0 0
18 — — — — — — — 1994 9–11 45.0% #72 1,556 0 0
19 2001 5–4 55.6% #139 1,519 0 0 1995 16–17 48.5% #46 1,665 0 0
20 2002 4–5 44.4% #117 1,527 0 0 1996 24–19 55.8% #28 1,751 0 0
21 2003 14–19 42.4% #63 1,537 0 0 1997 31–25 55.4% #21 1,837 0 1
22 2004 26–23 53.1% #46 1,611 0 0 1998 37–21 63.8% #18 1,862 0 3
23 2005 32–19 62.7% #35 1,764 0 2 1999 27–23 54.0% #24 1,807 0 3
24 2006 10–22 31.2% #117 1,546 0 2 2000 20–25 44.4% #32 1,679 0 3
25 2007 12–12 50.0% #63 1,578 0 2 2001 28–25 52.8% #30 1,718 0 3
26 2008 21–22 48.8% #72 1,574 0 2 2002 35–26 57.4% #24 1,755 0 3
27 2009 8–17 32.0% #90 1,533 0 2 2003 44–25 63.8% #10 1,915 0 5
28 2010 20–20 50.0% #41 1,656 0 2 2004 33–23 58.9% #17 1,808 0 6
29 2011 29–25 53.7% #41 1,713 0 2 2005 28–27 50.9% #29 1,741 0 6
30 2012 24–22 52.2% #28 1,721 0 2 2006 28–25 52.8% #26 1,743 0 6
31 2013 27–25 51.9% #35 1,675 0 2 2007 17–21 44.7% #38 1,633 0 6
32 2014 29–27 51.8% #40 1,611 0 3 2008 26–22 54.2% #31 1,713 0 6
33 2015 14–22 38.9% #99 1,549 0 3 2009 9–19 32.1% #97 1,627 0 6
34 2016 0–4 0.0% #400 1,486 0 3 — — — — — — —

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 Klara Koukalova Ai Sugiyama
Yr HardClayGrassCarpet Yr HardClayGrassCarpet
W L M Win % W L M Win % W L M Win % W L M Win % W L M Win % W L M Win % W L M Win % W L M Win %
16 — — — — — — — — — — — — — — — — — 1992 0 3 3 0.0% — — — — — — — — 1 1 2 50.0%
17 — — — — — — — — — — — — — — — — — 1993 2 3 5 40.0% — — — — 0 2 2 0.0% 1 3 4 25.0%
18 — — — — — — — — — — — — — — — — — 1994 6 7 13 46.2% — — — — 0 2 2 0.0% 3 2 5 60.0%
19 2001 — — — — 5 3 8 62.5% — — — — 0 1 1 0.0% 1995 5 8 13 38.5% 6 4 10 60.0% 0 2 2 0.0% 5 3 8 62.5%
20 2002 0 2 2 0.0% 4 3 7 57.1% — — — — — — — — 1996 19 11 30 63.3% 0 3 3 0.0% 4 2 6 66.7% 1 3 4 25.0%
21 2003 3 6 9 33.3% 11 11 22 50.0% 0 1 1 0.0% 0 1 1 0.0% 1997 19 13 32 59.4% 3 5 8 37.5% 2 2 4 50.0% 7 5 12 58.3%
22 2004 8 12 20 40.0% 13 9 22 59.1% 5 2 7 71.4% — — — — 1998 24 9 33 72.7% 6 5 11 54.5% 1 2 3 33.3% 6 5 11 54.5%
23 2005 16 11 27 59.3% 11 6 17 64.7% 5 1 6 83.3% 0 1 1 0.0% 1999 18 11 29 62.1% 3 4 7 42.9% 2 2 4 50.0% 4 6 10 40.0%
24 2006 4 11 15 26.7% 4 7 11 36.4% 1 3 4 25.0% 1 1 2 50.0% 2000 11 13 24 45.8% 6 5 11 54.5% 1 2 3 33.3% 2 5 7 28.6%
25 2007 5 7 12 41.7% 7 5 12 58.3% — — — — — — — — 2001 20 14 34 58.8% 4 6 10 40.0% 2 3 5 40.0% 2 2 4 50.0%
26 2008 6 9 15 40.0% 15 10 25 60.0% 0 2 2 0.0% 0 1 1 0.0% 2002 26 16 42 61.9% 4 6 10 40.0% 5 3 8 62.5% 0 1 1 0.0%
27 2009 1 7 8 12.5% 7 9 16 43.8% 0 1 1 0.0% — — — — 2003 29 16 45 64.4% 7 4 11 63.6% 4 2 6 66.7% 4 3 7 57.1%
28 2010 12 11 23 52.2% 5 8 13 38.5% 3 1 4 75.0% — — — — 2004 22 14 36 61.1% 5 5 10 50.0% 5 2 7 71.4% 1 2 3 33.3%
29 2011 16 15 31 51.6% 10 7 17 58.8% 2 2 4 50.0% 1 1 2 50.0% 2005 20 17 37 54.1% 7 6 13 53.8% 1 3 4 25.0% 0 1 1 0.0%
30 2012 8 12 20 40.0% 8 6 14 57.1% 5 3 8 62.5% 3 1 4 75.0% 2006 22 18 40 55.0% 1 3 4 25.0% 5 3 8 62.5% 0 1 1 0.0%
31 2013 17 16 33 51.5% 7 6 13 53.8% 2 2 4 50.0% 1 1 2 50.0% 2007 10 15 25 40.0% 3 2 5 60.0% 2 3 5 40.0% 2 1 3 66.7%
32 2014 18 17 35 51.4% 4 6 10 40.0% 6 3 9 66.7% 1 1 2 50.0% 2008 20 15 35 57.1% 4 5 9 44.4% 2 2 4 50.0% — — — —
33 2015 5 14 19 26.3% 6 5 11 54.5% 3 3 6 50.0% — — — — 2009 7 13 20 35.0% 0 4 4 0.0% 2 2 4 50.0% — — — —
34 2016 0 4 4 0.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
Career — 119 154 273 43.6% 117 101 218 53.7% 32 24 56 57.1% 7 9 16 43.8% — 280 216 496 56.5% 59 67 126 46.8% 38 39 77 49.4% 39 44 83 47.0%

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 66/96 of Klara Koukalova's and 170/347 of Ai Sugiyama'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 Klara Koukalova Ai Sugiyama
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%
27 — —/— — — — — — — — — — 2003 12/69 0.8 5.8 60.8% 64.3% 45.1% 53.4% 43.3% 56.6% 48.3%
28 — —/— — — — — — — — — — 2004 11/56 1.2 4.5 60.8% 64.1% 45.3% 64.6% 47.8% 56.5% 48.7%
29 — —/— — — — — — — — — — 2005 7/55 1.4 5.0 65.8% 58.7% 40.3% 46.6% 51.4% 53.1% 42.6%
30 — —/— — — — — — — — — — 2006 37/53 1.3 3.7 67.8% 60.4% 43.2% 56.7% 47.8% 54.8% 44.7%
31 — —/— — — — — — — — — — 2007 36/38 1.2 5.6 62.8% 58.7% 42.4% 52.3% 50.3% 52.7% 47.1%
32 2014 31/56 1.8 5.0 55.4% 61.0% 41.7% 47.6% 48.1% 51.9% 43.5% 2008 41/48 0.9 5.3 63.3% 60.9% 43.5% 52.1% 43.6% 54.4% 45.4%
33 2015 31/36 0.7 5.5 55.6% 60.9% 46.7% 43.3% 48.1% 54.4% 42.6% 2009 26/28 0.8 4.9 65.4% 58.3% 42.7% 43.8% 45.1% 52.8% 41.1%
34 2016 4/4 0.3 7.3 56.6% 57.9% 44.2% 56.5% 65.5% 52.2% 36.5% — —/— — — — — — — — — —
Career — 66/563 1.2 5.4 55.5% 60.8% 44.2% 46.1% 49.2% 53.1% 42.7% — 170/782 1.1 4.9 64.3% 60.3% 43.2% 52.6% 46.7% 54.1% 45.2%

Advanced Statistics Comparison by Age

Seasons are aligned by the age each player spent most of that calendar year. Metrics use eligible main-draw results; point statistics use matches with detailed data. 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 Klara Koukalova Ai Sugiyama
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
16 — — — — — — — — — — — — — — — — 1992 1478 102.6 — — — — +34 — — 30.8% -1.31 1–2 (33%) 0–2 — +0.31
17 — — — — — — — — — — — — — — — — 1993 1487 125.5 — — — — +44 — — 37.0% -0.89 1–4 (20%) — — -0.26
18 — — — — — — — — — — — — — — — — 1994 1557 120.7 — — — — +41 — — 47.8% +0.13 4–4 (50%) 1–2 (33%) — +1.49
19 2001 1520 104.0 — — — — — +55 — 47.8% +0.26 4–1 (80%) 0–1 — +1.03 1995 1665 135.9 — — — — -9 -11 — 49.3% +0.23 4–7 (36%) 3–0 (100%) 101.9 +0.28
20 2002 1527 105.4 — — — — — +71 — 50.0% -0.42 2–4 (33%) 1–0 — +0.68 1996 1751 143.7 — — — — -8 -156 -152 54.3% +0.29 5–5 (50%) 3–3 (50%) 99.1 +0.30
21 2003 1537 119.8 — — — — -60 +108 — 44.4% -0.35 7–8 (47%) 1–3 (25%) 99.1 +0.56 1997 1837 150.1 — — — — +27 -234 -204 51.5% 0.00 14–8 (64%) 11–8 (58%) 106.9 -1.35
22 2004 1612 117.6 — — — — -110 +85 +30 49.5% -0.07 8–7 (53%) 6–4 (60%) 103.5 +0.67 1998 1862 153.1 — — — — +57 -206 -239 60.3% +0.68 12–5 (71%) 9–4 (69%) 107.7 +0.41
23 2005 1764 126.4 — — — — -90 +7 -18 55.5% +0.09 15–4 (79%) 9–2 (82%) 118.0 +1.13 1999 1808 151.0 — — — — +46 -168 -203 53.0% +0.21 8–7 (53%) 4–4 (50%) 99.6 -1.12
24 2006 1547 107.1 — — — — +14 +77 +135 37.0% -1.05 2–7 (22%) 3–3 (50%) 92.0 +0.20 2000 1679 137.5 — — — — +24 +5 -92 46.1% -0.54 5–7 (42%) 7–5 (58%) 99.7 -0.80
25 2007 1579 115.5 — — — — -13 +59 — 50.0% +0.06 3–5 (38%) 3–4 (43%) 98.3 +0.21 2001 1719 138.7 — — — — +19 -57 -121 53.7% +0.17 10–11 (48%) 6–2 (75%) 102.9 -0.48
26 2008 1574 111.3 — — — — -45 +84 — 48.5% -0.08 10–9 (53%) 3–5 (38%) 100.5 +0.48 2002 1755 141.6 — — — — +15 -109 -67 56.1% +0.32 9–8 (53%) 8–6 (57%) 100.6 -0.40
27 2009 1534 110.3 — — — — -72 +97 — 35.0% -0.95 5–5 (50%) 4–5 (44%) 100.5 -0.40 2003 1915 154.1 +1.48 +3.41 1.113 52.2% -8 -157 -164 58.3% +0.63 22–10 (69%) 7–7 (50%) 105.4 +1.81
28 2010 1657 126.4 — — — — -49 -66 +4 46.2% -0.20 10–5 (67%) 5–6 (45%) 106.2 +0.89 2004 1808 144.1 +0.61 +2.40 1.121 52.5% -4 -67 +28 57.5% +0.58 8–7 (53%) 4–8 (33%) 97.4 +2.38
29 2011 1713 131.7 — — — — -15 -60 -54 50.4% -0.03 13–6 (68%) 7–4 (64%) 109.2 +0.80 2005 1742 133.4 -1.10 -0.52 0.908 47.7% +17 -41 -12 51.1% +0.11 11–16 (41%) 6–4 (60%) 94.4 +2.95
30 2012 1721 128.0 — — — — -45 -9 -3 51.0% +0.17 10–6 (63%) 5–7 (42%) 103.3 -0.68 2006 1744 138.5 -0.78 +0.79 0.988 49.8% +9 -91 +46 50.8% +0.14 10–8 (56%) 2–14 (13%) 94.4 +0.98
31 2013 1676 139.6 — — — — -9 +65 +31 51.7% +0.15 9–9 (50%) 6–9 (40%) 95.7 -1.87 2007 1633 125.5 -2.23 +2.56 0.996 50.0% -7 +43 +130 47.3% -0.13 8–9 (47%) 5–4 (56%) 98.7 +1.74
32 2014 1612 127.9 -2.87 -0.03 0.906 47.8% +13 +61 +151 50.8% -0.13 10–8 (56%) 11–4 (73%) 104.3 -0.55 2008 1713 136.4 -0.29 +1.82 0.995 49.6% +26 -71 +32 48.5% -0.19 8–5 (62%) 5–5 (50%) 105.2 +0.32
33 2015 1549 110.8 -2.79 +1.36 0.935 48.1% -28 +101 +170 40.5% -0.84 2–6 (25%) 3–4 (43%) 95.0 -0.51 2009 1627 135.9 -1.68 -1.34 0.871 46.9% +43 -37 +108 35.6% -0.86 2–5 (29%) 4–3 (57%) 100.4 -0.98
34 2016 1486 101.6 -2.24 -1.27 0.765 45.0% -28 — — 27.3% -1.55 0–3 (0%) 0–1 — +0.16 — — — — — — — — — — — — — — — —
Career — 1804 125.9 -2.79 +0.55 0.910 47.8% -34 +51 +56 47.9% -0.19 110–93 (54%) 67–62 (52%) 106.6 +0.50 — 1952 148.1 -0.87 +1.32 0.986 49.6% +18 -90 -55 52.1% +0.15 142–128 (53%) 85–81 (51%) 103.0 +0.97

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.