H2H data updated: 2026-09-12 00:00 UTC

Sloane Stephens vs Klara Koukalova H2H: 0-1

Klara Koukalova holds a 1–0 lead over Sloane Stephens in their WTA head-to-head. Across 1 main-draw meeting, Klara Koukalova leads 1–0 on hard courts. Most recently, Klara Koukalova won the 2013 Qatar Open round of 32 4-6 7-6(5) 7-6(5).

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Sloane Stephens
United States Age 33 Right-Handed 170 cm / 5'7"
H2H
0 – 1
1 main-draw meetings
Klara Koukalova
CZE Age 44 Right-Handed 166 cm / 5'5"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Klara Koukalova #24 4-6 7-6(5) 7-6(5) Sloane Stephens #17 Match data Feb 14, 2013* R32 Qatar Open Premier 5 → modern equivalent WTA 1000 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
Sloane Stephens #209 #3 5,727 1,952 303 249 54.9% 1 1 0 1 5 8
Klara Koukalova #566 #20 1,860 1,803 275 288 48.8% 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 Sloane Stephens Klara Koukalova
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
17 2010 2–3 40.0% #204 1,519 0 0 — — — — — — —
18 2011 7–9 43.8% #96 1,580 0 0 — — — — — — —
19 2012 21–17 55.3% #38 1,709 0 0 2001 5–4 55.6% #139 1,519 0 0
20 2013 40–22 64.5% #12 1,827 0 0 2002 4–5 44.4% #117 1,527 0 0
21 2014 20–19 51.3% #36 1,732 0 0 2003 14–19 42.4% #63 1,537 0 0
22 2015 34–20 63.0% #30 1,787 0 1 2004 26–23 53.1% #46 1,611 0 0
23 2016 21–10 67.7% #35 1,755 0 4 2005 32–19 62.7% #35 1,764 0 2
24 2017 15–8 65.2% #13 1,863 1 5 2006 10–22 31.2% #117 1,546 0 2
25 2018 34–19 64.2% #6 1,920 1 6 2007 12–12 50.0% #63 1,578 0 2
26 2019 22–19 53.7% #25 1,786 1 6 2008 21–22 48.8% #72 1,574 0 2
27 2020 4–11 26.7% #39 1,641 1 6 2009 8–17 32.0% #90 1,533 0 2
28 2021 18–17 51.4% #65 1,759 1 6 2010 20–20 50.0% #41 1,656 0 2
29 2022 18–17 51.4% #37 1,785 1 7 2011 29–25 53.7% #41 1,713 0 2
30 2023 21–20 51.2% #47 1,789 1 7 2012 24–22 52.2% #28 1,721 0 2
31 2024 19–21 47.5% #74 1,688 1 8 2013 27–25 51.9% #35 1,675 0 2
32 2025 0–5 0.0% #479 1,603 1 8 2014 29–27 51.8% #40 1,611 0 3
33 2026 7–12 36.8% #209 1,699 1 8 2015 14–22 38.9% #99 1,549 0 3
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 Sloane Stephens 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 %
17 2010 1 1 2 50.0% 1 2 3 33.3% — — — — — — — — — — — — — — — — — — — — — — — — —
18 2011 6 6 12 50.0% 1 3 4 25.0% — — — — — — — — — — — — — — — — — — — — — — — — —
19 2012 12 10 22 54.5% 7 6 13 53.8% 2 1 3 66.7% — — — — 2001 — — — — 5 3 8 62.5% — — — — 0 1 1 0.0%
20 2013 29 16 45 64.4% 7 5 12 58.3% 4 1 5 80.0% — — — — 2002 0 2 2 0.0% 4 3 7 57.1% — — — — — — — —
21 2014 11 10 21 52.4% 6 6 12 50.0% 3 3 6 50.0% — — — — 2003 3 6 9 33.3% 11 11 22 50.0% 0 1 1 0.0% 0 1 1 0.0%
22 2015 20 13 33 60.6% 8 5 13 61.5% 6 2 8 75.0% — — — — 2004 8 12 20 40.0% 13 9 22 59.1% 5 2 7 71.4% — — — —
23 2016 10 6 16 62.5% 9 3 12 75.0% 2 1 3 66.7% — — — — 2005 16 11 27 59.3% 11 6 17 64.7% 5 1 6 83.3% 0 1 1 0.0%
24 2017 15 7 22 68.2% — — — — 0 1 1 0.0% — — — — 2006 4 11 15 26.7% 4 7 11 36.4% 1 3 4 25.0% 1 1 2 50.0%
25 2018 24 13 37 64.9% 10 5 15 66.7% 0 1 1 0.0% — — — — 2007 5 7 12 41.7% 7 5 12 58.3% — — — — — — — —
26 2019 10 13 23 43.5% 10 4 14 71.4% 2 2 4 50.0% — — — — 2008 6 9 15 40.0% 15 10 25 60.0% 0 2 2 0.0% 0 1 1 0.0%
27 2020 3 8 11 27.3% 1 3 4 25.0% — — — — — — — — 2009 1 7 8 12.5% 7 9 16 43.8% 0 1 1 0.0% — — — —
28 2021 6 11 17 35.3% 10 5 15 66.7% 2 1 3 66.7% — — — — 2010 12 11 23 52.2% 5 8 13 38.5% 3 1 4 75.0% — — — —
29 2022 13 9 22 59.1% 5 6 11 45.5% 0 2 2 0.0% — — — — 2011 16 15 31 51.6% 10 7 17 58.8% 2 2 4 50.0% 1 1 2 50.0%
30 2023 12 14 26 46.2% 8 5 13 61.5% 1 1 2 50.0% — — — — 2012 8 12 20 40.0% 8 6 14 57.1% 5 3 8 62.5% 3 1 4 75.0%
31 2024 8 13 21 38.1% 9 5 14 64.3% 2 3 5 40.0% — — — — 2013 17 16 33 51.5% 7 6 13 53.8% 2 2 4 50.0% 1 1 2 50.0%
32 2025 0 5 5 0.0% — — — — — — — — — — — — 2014 18 17 35 51.4% 4 6 10 40.0% 6 3 9 66.7% 1 1 2 50.0%
33 2026 6 8 14 42.9% 1 4 5 20.0% — — — — — — — — 2015 5 14 19 26.3% 6 5 11 54.5% 3 3 6 50.0% — — — —
34 — — — — — — — — — — — — — — — — — 2016 0 4 4 0.0% — — — — — — — — — — — —
Career — 186 163 349 53.3% 93 67 160 58.1% 24 19 43 55.8% — — — — — 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 520/552 of Sloane Stephens'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 Sloane Stephens 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%
17 2010 5/5 0.6 3.6 64.1% 58.7% 39.2% 42.2% 62.2% 52.1% 42.9% — —/— — — — — — — — — —
18 2011 16/16 1.4 3.0 59.3% 59.3% 47.2% 41.8% 52.7% 54.1% 43.8% — —/— — — — — — — — — —
19 2012 36/38 1.7 3.6 62.4% 61.6% 46.4% 48.6% 43.2% 55.6% 45.1% — —/— — — — — — — — — —
20 2013 58/62 2.1 2.7 64.9% 63.2% 45.5% 49.3% 49.5% 56.8% 44.8% — —/— — — — — — — — — —
21 2014 37/39 1.7 2.4 68.3% 62.0% 46.2% 53.8% 38.4% 57.0% 41.9% — —/— — — — — — — — — —
22 2015 44/54 2.4 2.3 61.6% 65.6% 54.6% 58.0% 54.1% 61.5% 42.6% — —/— — — — — — — — — —
23 2016 29/31 2.0 1.8 65.8% 64.5% 49.5% 52.7% 47.8% 59.4% 44.8% — —/— — — — — — — — — —
24 2017 22/23 1.1 1.5 67.7% 61.0% 47.2% 59.8% 54.5% 56.6% 41.8% — —/— — — — — — — — — —
25 2018 47/53 0.8 1.5 69.8% 62.1% 49.9% 51.8% 51.5% 58.5% 47.2% — —/— — — — — — — — — —
26 2019 39/41 1.0 1.7 69.4% 59.9% 47.7% 47.6% 43.1% 56.2% 44.2% — —/— — — — — — — — — —
27 2020 15/15 2.2 2.0 69.5% 61.1% 47.1% 50.2% 44.4% 56.6% 40.0% — —/— — — — — — — — — —
28 2021 35/35 1.5 2.1 69.1% 59.7% 46.9% 57.7% 45.3% 55.7% 42.8% — —/— — — — — — — — — —
29 2022 35/35 1.2 2.1 71.3% 60.8% 45.5% 51.6% 51.8% 56.4% 44.7% — —/— — — — — — — — — —
30 2023 40/41 1.1 2.2 69.4% 60.6% 45.7% 51.1% 51.2% 56.1% 43.8% — —/— — — — — — — — — —
31 2024 40/40 0.8 1.6 72.9% 58.8% 49.8% 46.9% 39.1% 55.9% 42.6% — —/— — — — — — — — — —
32 2025 3/5 1.0 2.7 64.5% 54.1% 31.3% 50.1% 42.1% 46.2% 40.7% 2014 31/56 1.8 5.0 55.4% 61.0% 41.7% 47.6% 48.1% 51.9% 43.5%
33 2026 19/19 0.9 2.0 66.5% 57.5% 47.5% 54.6% 45.5% 54.2% 39.3% 2015 31/36 0.7 5.5 55.6% 60.9% 46.7% 43.3% 48.1% 54.4% 42.6%
34 — —/— — — — — — — — — — 2016 4/4 0.3 7.3 56.6% 57.9% 44.2% 56.5% 65.5% 52.2% 36.5%
Career — 520/552 1.5 2.2 67.3% 61.4% 47.7% 51.6% 47.6% 56.9% 43.7% — 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 Sloane Stephens 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
17 2010 1519 108.2 -1.34 +0.26 0.895 47.8% — +19 — 40.0% -1.10 — 2–0 — -0.36 — — — — — — — — — — — — — — — —
18 2011 1581 116.3 -0.64 -0.35 0.955 48.8% +19 -78 — 40.6% -0.69 1–1 2–0 — +0.03 — — — — — — — — — — — — — — — —
19 2012 1709 130.0 +0.14 +1.30 1.016 50.3% -38 -86 -53 52.7% +0.20 9–8 (53%) 5–5 (50%) 102.2 +0.59 2001 1520 104.0 — — — — — +55 — 47.8% +0.26 4–1 (80%) 0–1 — +1.03
20 2013 1827 148.1 +1.68 +1.63 1.037 50.8% -16 -126 -97 58.2% +0.39 17–7 (71%) 8–6 (57%) 109.7 +0.29 2002 1527 105.4 — — — — — +71 — 50.0% -0.42 2–4 (33%) 1–0 — +0.68
21 2014 1733 132.5 +1.10 -0.90 0.974 49.4% +23 -27 -2 51.7% -0.02 5–6 (45%) 5–3 (63%) 100.3 +0.75 2003 1537 119.8 — — — — -60 +108 — 44.4% -0.35 7–8 (47%) 1–3 (25%) 99.1 +0.56
22 2015 1787 143.0 +3.00 +2.02 1.106 52.3% -23 -18 -9 60.9% +0.54 5–8 (38%) 10–1 (91%) 104.6 -2.66 2004 1612 117.6 — — — — -110 +85 +30 49.5% -0.07 8–7 (53%) 6–4 (60%) 103.5 +0.67
23 2016 1756 122.0 +2.14 +0.81 1.106 52.0% -20 +53 +23 60.9% +0.56 7–2 (78%) 8–2 (80%) 107.2 +0.83 2005 1764 126.4 — — — — -90 +7 -18 55.5% +0.09 15–4 (79%) 9–2 (82%) 118.0 +1.13
24 2017 1864 153.6 +0.98 +1.17 0.964 49.2% +11 — — 57.7% +0.35 8–0 (100%) 4–2 (67%) 111.8 -1.70 2006 1547 107.1 — — — — +14 +77 +135 37.0% -1.05 2–7 (22%) 3–3 (50%) 92.0 +0.20
25 2018 1921 157.9 +2.48 +3.98 1.139 52.7% +6 -17 — 61.0% +0.94 10–9 (53%) 3–7 (30%) 96.1 -0.56 2007 1579 115.5 — — — — -13 +59 — 50.0% +0.06 3–5 (38%) 3–4 (43%) 98.3 +0.21
26 2019 1786 136.3 -0.49 +1.33 1.009 50.2% -24 +182 -21 52.6% -0.19 7–6 (54%) 11–2 (85%) 104.6 +1.76 2008 1574 111.3 — — — — -45 +84 — 48.5% -0.08 10–9 (53%) 3–5 (38%) 100.5 +0.48
27 2020 1641 114.3 +0.15 -1.60 0.922 48.1% +16 +243 — 37.8% -0.68 1–6 (14%) 1–1 — +1.57 2009 1534 110.3 — — — — -72 +97 — 35.0% -0.95 5–5 (50%) 4–5 (44%) 100.5 -0.40
28 2021 1760 134.1 -0.59 +0.37 0.967 49.3% -115 +157 +83 52.4% -0.19 6–8 (43%) 3–5 (38%) 97.2 -0.75 2010 1657 126.4 — — — — -49 -66 +4 46.2% -0.20 10–5 (67%) 5–6 (45%) 106.2 +0.89
29 2022 1785 140.6 -0.05 +2.25 1.024 50.4% +9 +46 — 50.6% +0.06 7–8 (47%) 2–2 (50%) 98.7 +0.24 2011 1713 131.7 — — — — -15 -60 -54 50.4% -0.03 13–6 (68%) 7–4 (64%) 109.2 +0.80
30 2023 1790 135.6 -0.42 +1.25 0.998 49.9% -56 +122 — 50.5% +0.02 6–7 (46%) 3–6 (33%) 94.4 -0.37 2012 1721 128.0 — — — — -45 -9 -3 51.0% +0.17 10–6 (63%) 5–7 (42%) 103.3 -0.68
31 2024 1689 137.0 -0.42 -0.12 0.965 49.0% -19 +171 +35 47.3% -0.11 6–5 (55%) 1–2 (33%) — -1.59 2013 1676 139.6 — — — — -9 +65 +31 51.7% +0.15 9–9 (50%) 6–9 (40%) 95.7 -1.87
32 2025 1604 109.9 -1.23 +0.23 0.757 43.6% -34 — — 16.7% -2.34 0–2 — — -0.11 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 2026 1699 132.4 -1.61 -2.12 0.859 47.0% -20 +56 — 36.6% -1.20 2–1 (67%) 1–1 — -0.66 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 1486 101.6 -2.24 -1.27 0.765 45.0% -28 — — 27.3% -1.55 0–3 (0%) 0–1 — +0.16
Career — 1952 145.6 +0.68 +1.07 1.013 50.2% -17 +47 -9 53.0% +0.11 97–84 (54%) 69–45 (61%) 107.5 -0.49 — 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.