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

Serena Williams vs Klara Koukalova H2H: 3-2 (incl. walkovers)

Serena Williams vs Klara Koukalova: 3–1 excluding walkovers; 3–2 including 1 walkover. Across 5 main-draw results including walkovers, Serena Williams leads 3–2 on clay. Most recently, Klara Koukalova won the 2015 Bastad round of 16 W/O.

Want to explore more matchups? Advanced rivalry search lets you browse current and historical rivalries, unbeaten records, or every matchup for a player.

Serena Williams
USA Age 44 Right-Handed 175 cm / 5'9"
H2H including walkovers
3 – 2
5 main-draw results
Klara Koukalova
CZE Age 44 Right-Handed 166 cm / 5'5"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Klara Koukalova #105 (w/o) Serena Williams #1 Match data Jul 17, 2015* R16 Bastad International → modern equivalent WTA 250 Clay
Serena Williams #1 6-0 6-4 Klara Koukalova #37 Match data Jul 20, 2013* SF Bastad International → modern equivalent WTA 250 Clay
Serena Williams #2 6-3 6-7(5) 6-4 Klara Koukalova #100 Match data May 26, 2009* R128 Roland Garros Grand Slam Clay
Klara Koukalova #95 6-4 3-6 6-1 Serena Williams #1 Match data Apr 9, 2009* R32 Marbella International → modern equivalent WTA 250 Clay
Serena Williams #1 6-4 6-3 Klara Koukalova #72 Match data May 15, 2003* R32 Italian Open Tier I → modern equivalent WTA 1000 Clay

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 Olympics 1000 including documented historical predecessor categories Finals 500 including documented historical predecessor categories 250 including documented historical predecessor categories Titles
Serena Williams #320 #1 13,615 2,399 837 172 83.0% 23 1 23 6 18 2 73
Klara Koukalova #566 #20 1,860 1,803 275 288 48.8% 0 0 0 0 0 3 3

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 Serena Williams Klara Koukalova
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
15 1997 3–2 60.0% #101 1,582 0 0 — — — — — — —
16 1998 26–11 70.3% #20 1,893 0 0 — — — — — — —
17 1999 38–7 84.4% #4 2,189 1 5 — — — — — — —
18 2000 37–8 82.2% #6 2,184 1 8 — — — — — — —
19 2001 40–7 85.1% #6 2,237 1 11 2001 5–4 55.6% #139 1,519 0 0
20 2002 57–5 91.9% #1 2,339 4 19 2002 4–5 44.4% #117 1,527 0 0
21 2003 36–3 92.3% #3 2,365 6 23 2003 14–19 42.4% #63 1,537 0 0
22 2004 39–11 78.0% #7 2,225 6 25 2004 26–23 53.1% #46 1,611 0 0
23 2005 21–9 70.0% #11 2,101 7 26 2005 32–19 62.7% #35 1,764 0 2
24 2006 12–4 75.0% #95 2,063 7 26 2006 10–22 31.2% #117 1,546 0 2
25 2007 34–10 77.3% #7 2,077 8 28 2007 12–12 50.0% #63 1,578 0 2
26 2008 44–9 83.0% #2 2,126 9 32 2008 21–22 48.8% #72 1,574 0 2
27 2009 50–13 79.4% #1 2,120 11 35 2009 8–17 32.0% #90 1,533 0 2
28 2010 25–4 86.2% #4 2,158 13 37 2010 20–20 50.0% #41 1,656 0 2
29 2011 22–4 84.6% #12 2,182 13 39 2011 29–25 53.7% #41 1,713 0 2
30 2012 54–6 90.0% #3 2,302 15 46 2012 24–22 52.2% #28 1,721 0 2
31 2013 77–5 93.9% #1 2,382 17 57 2013 27–25 51.9% #35 1,675 0 2
32 2014 52–10 83.9% #1 2,272 18 64 2014 29–27 51.8% #40 1,611 0 3
33 2015 50–6 89.3% #1 2,292 21 69 2015 14–22 38.9% #99 1,549 0 3
34 2016 38–6 86.4% #2 2,208 22 71 2016 0–4 0.0% #400 1,486 0 3
35 2017 8–1 88.9% #22 2,200 23 72 — — — — — — —
36 2018 18–7 72.0% #16 2,112 23 72 — — — — — — —
37 2019 25–8 75.8% #10 2,093 23 72 — — — — — — —
38 2020 16–5 76.2% #11 2,045 23 73 — — — — — — —
39 2021 12–6 66.7% #41 1,994 23 73 — — — — — — —
40 2022 3–4 42.9% #320 1,926 23 73 — — — — — — —
44 2026 0–1 0.0% #320 1,899 23 73 — — — — — — —

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 Serena Williams Klara Koukalova
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 %
15 1997 — — — — — — — — — — — — 3 2 5 60.0% — — — — — — — — — — — — — — — — —
16 1998 16 7 23 69.6% 6 2 8 75.0% 4 2 6 66.7% — — — — — — — — — — — — — — — — — — — — —
17 1999 27 4 31 87.1% 6 3 9 66.7% — — — — 5 0 5 100.0% — — — — — — — — — — — — — — — — —
18 2000 29 5 34 85.3% 0 1 1 0.0% 5 1 6 83.3% 3 1 4 75.0% — — — — — — — — — — — — — — — — —
19 2001 32 5 37 86.5% 4 1 5 80.0% 4 1 5 80.0% — — — — 2001 — — — — 5 3 8 62.5% — — — — 0 1 1 0.0%
20 2002 28 3 31 90.3% 18 2 20 90.0% 7 0 7 100.0% 4 0 4 100.0% 2002 0 2 2 0.0% 4 3 7 57.1% — — — — — — — —
21 2003 13 0 13 100.0% 12 3 15 80.0% 7 0 7 100.0% 4 0 4 100.0% 2003 3 6 9 33.3% 11 11 22 50.0% 0 1 1 0.0% 0 1 1 0.0%
22 2004 23 6 29 79.3% 10 4 14 71.4% 6 1 7 85.7% — — — — 2004 8 12 20 40.0% 13 9 22 59.1% 5 2 7 71.4% — — — —
23 2005 16 5 21 76.2% 2 2 4 50.0% 2 1 3 66.7% 1 1 2 50.0% 2005 16 11 27 59.3% 11 6 17 64.7% 5 1 6 83.3% 0 1 1 0.0%
24 2006 12 4 16 75.0% — — — — — — — — — — — — 2006 4 11 15 26.7% 4 7 11 36.4% 1 3 4 25.0% 1 1 2 50.0%
25 2007 24 6 30 80.0% 6 3 9 66.7% 4 1 5 80.0% — — — — 2007 5 7 12 41.7% 7 5 12 58.3% — — — — — — — —
26 2008 27 5 32 84.4% 11 3 14 78.6% 6 1 7 85.7% — — — — 2008 6 9 15 40.0% 15 10 25 60.0% 0 2 2 0.0% 0 1 1 0.0%
27 2009 36 8 44 81.8% 4 4 8 50.0% 7 0 7 100.0% 3 1 4 75.0% 2009 1 7 8 12.5% 7 9 16 43.8% 0 1 1 0.0% — — — —
28 2010 10 1 11 90.9% 8 3 11 72.7% 7 0 7 100.0% — — — — 2010 12 11 23 52.2% 5 8 13 38.5% 3 1 4 75.0% — — — —
29 2011 18 2 20 90.0% — — — — 4 2 6 66.7% — — — — 2011 16 15 31 51.6% 10 7 17 58.8% 2 2 4 50.0% 1 1 2 50.0%
30 2012 26 4 30 86.7% 15 2 17 88.2% 13 0 13 100.0% — — — — 2012 8 12 20 40.0% 8 6 14 57.1% 5 3 8 62.5% 3 1 4 75.0%
31 2013 46 4 50 92.0% 28 0 28 100.0% 3 1 4 75.0% — — — — 2013 17 16 33 51.5% 7 6 13 53.8% 2 2 4 50.0% 1 1 2 50.0%
32 2014 41 6 47 87.2% 9 3 12 75.0% 2 1 3 66.7% — — — — 2014 18 17 35 51.4% 4 6 10 40.0% 6 3 9 66.7% 1 1 2 50.0%
33 2015 30 3 33 90.9% 13 3 16 81.3% 7 0 7 100.0% — — — — 2015 5 14 19 26.3% 6 5 11 54.5% 3 3 6 50.0% — — — —
34 2016 20 5 25 80.0% 11 1 12 91.7% 7 0 7 100.0% — — — — 2016 0 4 4 0.0% — — — — — — — — — — — —
35 2017 8 1 9 88.9% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
36 2018 9 5 14 64.3% 3 1 4 75.0% 6 1 7 85.7% — — — — — — — — — — — — — — — — — — — — —
37 2019 16 5 21 76.2% 3 2 5 60.0% 6 1 7 85.7% — — — — — — — — — — — — — — — — — — — — —
38 2020 15 4 19 78.9% 1 1 2 50.0% — — — — — — — — — — — — — — — — — — — — — — — — —
39 2021 8 2 10 80.0% 4 3 7 57.1% 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — —
40 2022 3 3 6 50.0% — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — —
44 2026 — — — — — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — —
Career — 533 103 636 83.8% 174 47 221 78.7% 107 17 124 86.3% 23 5 28 82.1% — 119 154 273 43.6% 117 101 218 53.7% 32 24 56 57.1% 7 9 16 43.8%

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 633/768 of Serena Williams's and 66/96 of Klara Koukalova'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 Serena Williams Klara Koukalova
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%
21 2003 13/39 3.9 2.1 61.7% 74.0% 52.8% 63.9% 58.8% 66.1% 51.8% — —/— — — — — — — — — —
22 2004 16/50 6.4 2.6 61.3% 73.3% 51.5% 64.8% 54.6% 64.9% 49.7% — —/— — — — — — — — — —
23 2005 14/30 5.9 2.6 61.2% 74.1% 52.5% 68.0% 48.3% 65.1% 47.5% — —/— — — — — — — — — —
24 2006 15/16 6.3 2.9 59.3% 74.2% 47.4% 54.7% 58.2% 63.1% 46.9% — —/— — — — — — — — — —
25 2007 42/44 6.1 2.6 59.4% 69.2% 48.1% 58.2% 57.3% 60.8% 46.0% — —/— — — — — — — — — —
26 2008 44/53 6.8 2.7 61.4% 73.4% 45.2% 60.0% 47.6% 62.7% 47.7% — —/— — — — — — — — — —
27 2009 57/63 6.2 2.8 60.8% 75.0% 50.7% 54.5% 48.2% 65.3% 46.2% — —/— — — — — — — — — —
28 2010 29/29 8.6 2.9 62.3% 77.4% 47.5% 66.0% 51.5% 66.4% 46.8% — —/— — — — — — — — — —
29 2011 25/26 8.0 2.5 59.0% 79.5% 53.0% 67.2% 50.8% 68.7% 46.9% — —/— — — — — — — — — —
30 2012 48/60 8.2 2.3 59.0% 78.7% 54.8% 66.6% 53.2% 68.8% 49.8% — —/— — — — — — — — — —
31 2013 74/82 6.1 2.2 63.0% 76.5% 53.5% 60.3% 56.0% 68.1% 52.4% — —/— — — — — — — — — —
32 2014 56/62 7.7 3.5 59.3% 76.5% 51.6% 64.4% 52.8% 66.3% 48.9% 2014 31/56 1.8 5.0 55.4% 61.0% 41.7% 47.6% 48.1% 51.9% 43.5%
33 2015 50/56 9.5 3.5 59.9% 76.7% 55.9% 67.3% 54.5% 68.4% 47.8% 2015 31/36 0.7 5.5 55.6% 60.9% 46.7% 43.3% 48.1% 54.4% 42.6%
34 2016 41/44 7.9 2.8 62.3% 77.4% 51.9% 58.8% 50.6% 68.0% 49.0% 2016 4/4 0.3 7.3 56.6% 57.9% 44.2% 56.5% 65.5% 52.2% 36.5%
35 2017 9/9 7.9 3.9 55.9% 79.6% 46.7% 57.9% 51.3% 65.7% 46.5% — —/— — — — — — — — — —
36 2018 24/25 7.1 3.4 59.2% 74.2% 48.5% 55.3% 51.9% 63.9% 44.0% — —/— — — — — — — — — —
37 2019 31/33 6.6 2.8 59.2% 76.5% 50.4% 50.4% 45.6% 65.5% 46.7% — —/— — — — — — — — — —
38 2020 20/21 8.9 2.7 61.3% 73.3% 50.7% 71.0% 49.7% 64.3% 44.9% — —/— — — — — — — — — —
39 2021 17/18 5.1 2.6 57.4% 72.6% 48.9% 43.6% 49.4% 62.4% 46.2% — —/— — — — — — — — — —
40 2022 7/7 8.0 4.7 65.0% 68.0% 35.4% 62.0% 45.8% 56.6% 40.5% — —/— — — — — — — — — —
44 2026 1/1 7.0 7.0 79.0% 62.7% 45.0% 54.6% 27.3% 59.0% 38.2% — —/— — — — — — — — — —
Career — 633/1,009 7.2 2.8 60.6% 75.5% 50.9% 60.9% 52.1% 65.8% 48.0% — 66/563 1.2 5.4 55.5% 60.8% 44.2% 46.1% 49.2% 53.1% 42.7%

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 Serena Williams Klara Koukalova
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 1997 1582 144.0 — — — — +42 — — 54.5% +0.82 1–0 1–1 — -0.18 — — — — — — — — — — — — — — — —
16 1998 1893 158.1 — — — — -62 -201 -189 64.6% +1.29 8–5 (62%) 2–3 (40%) 106.2 -1.19 — — — — — — — — — — — — — — — —
17 1999 2189 178.2 — — — — +12 -418 — 80.2% +2.10 8–5 (62%) 6–0 (100%) 108.5 -2.69 — — — — — — — — — — — — — — — —
18 2000 2185 168.9 — — — — +24 — -372 80.6% +2.43 6–1 (86%) 4–3 (57%) 102.2 +0.57 — — — — — — — — — — — — — — — —
19 2001 2238 172.8 — — — — +36 -434 -326 79.2% +2.45 7–4 (64%) 5–5 (50%) 100.5 -2.79 2001 1520 104.0 — — — — — +55 — 47.8% +0.26 4–1 (80%) 0–1 — +1.03
20 2002 2339 173.4 — — — — +18 -278 -232 87.1% +2.70 9–3 (75%) 11–1 (92%) 111.5 -2.86 2002 1527 105.4 — — — — — +71 — 50.0% -0.42 2–4 (33%) 1–0 — +0.68
21 2003 2365 170.4 +7.11 +5.95 1.527 58.7% +80 -218 -130 86.0% +2.74 6–2 (75%) 2–0 — -1.67 2003 1537 119.8 — — — — -60 +108 — 44.4% -0.35 7–8 (47%) 1–3 (25%) 99.1 +0.56
22 2004 2226 163.6 +6.68 +4.43 1.416 56.9% +107 -101 +86 74.8% +1.90 9–4 (69%) 4–3 (57%) 96.9 -0.38 2004 1612 117.6 — — — — -110 +85 +30 49.5% -0.07 8–7 (53%) 6–4 (60%) 103.5 +0.67
23 2005 2101 150.6 +5.70 +2.41 1.360 56.0% +157 -3 +122 70.0% +1.48 8–0 (100%) 1–6 (14%) 99.2 -0.26 2005 1764 126.4 — — — — -90 +7 -18 55.5% +0.09 15–4 (79%) 9–2 (82%) 118.0 +1.13
24 2006 2064 147.1 +4.12 +2.38 1.272 54.9% +120 — — 69.4% +1.75 3–1 (75%) 0–3 (0%) 96.2 -0.43 2006 1547 107.1 — — — — +14 +77 +135 37.0% -1.05 2–7 (22%) 3–3 (50%) 92.0 +0.20
25 2007 2077 165.4 +4.80 +3.80 1.173 53.4% +88 +12 +155 78.3% +1.84 6–4 (60%) 9–3 (75%) 101.7 -2.31 2007 1579 115.5 — — — — -13 +59 — 50.0% +0.06 3–5 (38%) 3–4 (43%) 98.3 +0.21
26 2008 2126 164.9 +6.89 +4.29 1.280 55.0% +42 -33 +130 80.0% +2.11 9–4 (69%) 5–2 (71%) 102.9 -1.00 2008 1574 111.3 — — — — -45 +84 — 48.5% -0.08 10–9 (53%) 3–5 (38%) 100.5 +0.48
27 2009 2120 165.8 +9.20 +3.92 1.332 55.3% +59 -117 +157 75.6% +1.76 11–6 (65%) 8–8 (50%) 98.1 -2.33 2009 1534 110.3 — — — — -72 +97 — 35.0% -0.95 5–5 (50%) 4–5 (44%) 100.5 -0.40
28 2010 2159 157.0 +8.78 +3.86 1.393 56.1% +37 -163 +212 79.1% +2.01 6–3 (67%) 10–2 (83%) 106.5 -1.14 2010 1657 126.4 — — — — -49 -66 +4 46.2% -0.20 10–5 (67%) 5–6 (45%) 106.2 +0.89
29 2011 2182 160.3 +9.93 +4.56 1.499 57.5% +57 — +125 78.9% +2.33 6–1 (86%) 3–2 (60%) 101.2 -0.27 2011 1713 131.7 — — — — -15 -60 -54 50.4% -0.03 13–6 (68%) 7–4 (64%) 109.2 +0.80
30 2012 2302 168.5 +11.57 +6.33 1.597 58.7% -26 -157 +62 88.2% +2.98 6–1 (86%) 3–2 (60%) 103.3 -2.18 2012 1721 128.0 — — — — -45 -9 -3 51.0% +0.17 10–6 (63%) 5–7 (42%) 103.3 -0.68
31 2013 2383 177.8 +12.05 +8.21 1.643 59.9% -2 -40 +41 89.7% +3.22 10–4 (71%) 3–3 (50%) 101.0 -0.69 2013 1676 139.6 — — — — -9 +65 +31 51.7% +0.15 9–9 (50%) 6–9 (40%) 95.7 -1.87
32 2014 2273 171.7 +9.98 +6.05 1.454 57.3% +55 +1 +33 83.6% +2.37 7–3 (70%) 8–0 (100%) 102.4 -0.53 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
33 2015 2293 165.1 +9.57 +5.97 1.514 57.9% +37 -12 +16 81.3% +2.24 17–2 (89%) 7–2 (78%) 105.8 -0.61 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
34 2016 2208 161.7 +10.55 +5.23 1.529 57.9% +31 +121 +136 83.0% +2.39 4–2 (67%) 8–2 (80%) 100.3 -0.68 2016 1486 101.6 -2.24 -1.27 0.765 45.0% -28 — — 27.3% -1.55 0–3 (0%) 0–1 — +0.16
35 2017 2201 137.8 +4.47 +1.79 1.354 56.0% +39 — — 89.5% +2.32 0–1 1–0 — -0.09 — — — — — — — — — — — — — — — —
36 2018 2112 148.0 +5.23 +2.07 1.220 53.7% +22 +268 +229 71.2% +1.29 3–1 (75%) 3–0 (100%) 102.0 -0.74 — — — — — — — — — — — — — — — —
37 2019 2094 156.8 +7.34 +3.63 1.352 55.6% +42 +282 +271 77.3% +2.05 7–1 (88%) — — -0.12 — — — — — — — — — — — — — — — —
38 2020 2046 143.2 +4.70 +1.29 1.259 54.8% +19 — — 70.6% +1.55 7–4 (64%) 4–3 (57%) 97.0 +0.57 — — — — — — — — — — — — — — — —
39 2021 1994 145.6 +4.15 +2.90 1.229 53.9% +132 +333 — 68.6% +1.54 3–0 (100%) 2–2 (50%) 101.9 -0.19 — — — — — — — — — — — — — — — —
40 2022 1926 119.5 +0.06 -0.90 0.934 48.7% +144 — — 47.1% -0.35 1–2 (33%) 2–1 (67%) — +0.04 — — — — — — — — — — — — — — — —
44 2026 1899 96.8 +0.09 -3.44 0.931 47.3% — — — 33.3% -1.67 0–1 1–0 — +0.12 — — — — — — — — — — — — — — — —
Career — 2399 174.5 +8.45 +4.77 1.403 56.6% +43 -85 +34 79.6% +2.21 168–65 (72%) 113–57 (66%) 110.8 -2.44 — 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

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.