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

Stefan Kozlov vs Sam Querrey H2H: 0-2

Sam Querrey holds a 2–0 lead over Stefan Kozlov in their ATP head-to-head. Across 2 main-draw meetings, Sam Querrey leads 1–0 on grass and 1–0 on hard courts. Most recently, Sam Querrey won the 2017 Cincinnati Open first round 6-3 6-0.

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Stefan Kozlov
United States Age 28 Right-Handed 183 cm / 6'0"
H2H
0 – 2
2 main draw meetings
Sam Querrey
USA Age 38 Right-Handed 198 cm / 6'6"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Sam Querrey #20 6-3 6-0 Stefan Kozlov #133 Match data Aug 15, 2017* R64 Cincinnati Open Masters 1000 Hard
Sam Querrey #37 6-3 6-0 Stefan Kozlov #196 Match data Jun 12, 2016* QF Libéma Open ATP 250 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
Stefan Kozlov #297 #103 558 1,673 9 26 25.7% 0 0 0 0 0 0
Sam Querrey #529 #11 2,595 2,038 372 316 54.1% 0 0 0 2 8 10

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 Sam Querrey
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 — — — — — — —
18 2016 3–2 60.0% #116 1,481 0 0 2006 6–11 35.3% #130 1,541 0 0
19 2017 2–9 18.2% #167 1,549 0 0 2007 19–22 46.3% #63 1,637 0 0
20 2018 0–1 0.0% #316 1,528 0 0 2008 28–24 53.8% #39 1,778 0 1
21 — — — — — — — 2009 39–22 63.9% #25 1,900 0 2
22 2020 0–1 0.0% #371 1,514 0 0 2010 35–21 62.5% #18 1,872 0 6
23 2021 0–1 0.0% #159 1,550 0 0 2011 12–13 48.0% #93 1,817 0 6
24 2022 4–8 33.3% #198 1,529 0 0 2012 37–24 60.7% #22 2,005 0 7
25 — — — — — — — 2013 25–21 54.3% #46 1,875 0 7
26 — — — — — — — 2014 26–20 56.5% #35 1,896 0 7
27 — — — — — — — 2015 20–24 45.5% #59 1,812 0 7
28 — — — — — — — 2016 28–23 54.9% #31 1,797 0 8
29 — — — — — — — 2017 35–20 63.6% #13 1,944 0 10
30 — — — — — — — 2018 21–22 48.8% #51 1,823 0 10
31 — — — — — — — 2019 24–17 58.5% #44 1,898 0 10
32 — — — — — — — 2020 3–6 33.3% #53 1,818 0 10
33 — — — — — — — 2021 10–16 38.5% #108 1,689 0 10
34 — — — — — — — 2022 4–10 28.6% #329 1,644 0 10

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 Sam Querrey
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 2013 — — — — — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — —
16 2014 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
17 2015 0 2 2 0.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
18 2016 — — — — — — — — 3 2 5 60.0% — — — — 2006 5 10 15 33.3% — — — — 1 1 2 50.0% — — — —
19 2017 0 6 6 0.0% — — — — 2 3 5 40.0% — — — — 2007 18 14 32 56.3% 1 5 6 16.7% 0 2 2 0.0% 0 1 1 0.0%
20 2018 — — — — 0 1 1 0.0% — — — — — — — — 2008 23 16 39 59.0% 4 4 8 50.0% 1 3 4 25.0% 0 1 1 0.0%
21 — — — — — — — — — — — — — — — — — 2009 30 14 44 68.2% 1 4 5 20.0% 8 4 12 66.7% — — — —
22 2020 0 1 1 0.0% — — — — — — — — — — — — 2010 19 14 33 57.6% 7 5 12 58.3% 9 2 11 81.8% — — — —
23 2021 0 1 1 0.0% — — — — — — — — — — — — 2011 8 8 16 50.0% 2 4 6 33.3% 2 1 3 66.7% — — — —
24 2022 4 6 10 40.0% — — — — 0 2 2 0.0% — — — — 2012 28 16 44 63.6% 2 4 6 33.3% 7 4 11 63.6% — — — —
25 — — — — — — — — — — — — — — — — — 2013 21 14 35 60.0% 3 4 7 42.9% 1 3 4 25.0% — — — —
26 — — — — — — — — — — — — — — — — — 2014 16 14 30 53.3% 4 3 7 57.1% 6 3 9 66.7% — — — —
27 — — — — — — — — — — — — — — — — — 2015 8 15 23 34.8% 6 5 11 54.5% 6 4 10 60.0% — — — —
28 — — — — — — — — — — — — — — — — — 2016 16 14 30 53.3% 4 5 9 44.4% 8 4 12 66.7% — — — —
29 — — — — — — — — — — — — — — — — — 2017 23 13 36 63.9% 5 4 9 55.6% 7 3 10 70.0% — — — —
30 — — — — — — — — — — — — — — — — — 2018 16 16 32 50.0% 1 4 5 20.0% 4 2 6 66.7% — — — —
31 — — — — — — — — — — — — — — — — — 2019 13 14 27 48.1% 3 1 4 75.0% 8 2 10 80.0% — — — —
32 — — — — — — — — — — — — — — — — — 2020 3 4 7 42.9% 0 2 2 0.0% — — — — — — — —
33 — — — — — — — — — — — — — — — — — 2021 2 9 11 18.2% 0 2 2 0.0% 8 5 13 61.5% — — — —
34 — — — — — — — — — — — — — — — — — 2022 1 5 6 16.7% 1 1 2 50.0% 2 4 6 33.3% — — — —
Career — 4 17 21 19.0% 0 1 1 0.0% 5 8 13 38.5% — — — — — 250 210 460 54.3% 44 57 101 43.6% 78 47 125 62.4% 0 2 2 0.0%

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 35/35 of Stefan Kozlov's and 684/688 of Sam Querrey'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 Sam Querrey
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% — —/— — — — — — — — — —
18 2016 5/5 4.2 4.8 55.8% 67.8% 41.9% 67.2% 40.4% 56.9% 38.4% 2006 17/17 11.4 3.2 57.2% 75.9% 49.8% 62.8% 42.9% 64.6% 34.0%
19 2017 11/11 3.6 4.1 58.0% 65.2% 44.1% 53.2% 35.0% 56.5% 32.9% 2007 41/41 12.4 3.2 56.6% 79.2% 48.3% 59.9% 39.4% 65.8% 33.9%
20 2018 1/1 2.0 5.0 50.9% 65.5% 35.7% 20.0% 50.0% 50.9% 28.0% 2008 51/52 10.2 3.2 59.1% 74.3% 49.1% 61.1% 41.2% 64.2% 35.5%
21 — —/— — — — — — — — — — 2009 61/61 11.8 3.0 59.4% 80.0% 53.4% 60.4% 44.4% 69.2% 36.2%
22 2020 1/1 1.0 5.0 68.5% 54.1% 57.1% 36.4% 50.0% 55.1% 31.7% 2010 56/56 12.3 3.4 61.5% 79.4% 50.9% 64.4% 45.2% 68.3% 35.1%
23 2021 1/1 1.0 1.0 76.4% 54.8% 61.5% 42.9% 25.0% 56.4% 32.7% 2011 25/25 8.9 3.2 59.6% 74.8% 51.2% 66.6% 31.2% 65.2% 34.4%
24 2022 12/12 1.6 4.8 72.4% 60.0% 43.6% 59.6% 35.7% 55.2% 36.0% 2012 61/61 11.6 3.9 57.6% 80.5% 51.1% 60.0% 42.0% 68.1% 36.0%
25 — —/— — — — — — — — — — 2013 45/46 12.8 3.6 59.6% 78.6% 48.7% 57.6% 35.7% 66.5% 33.6%
26 — —/— — — — — — — — — — 2014 45/46 14.4 2.8 60.5% 79.4% 51.9% 73.7% 41.8% 68.7% 33.8%
27 — —/— — — — — — — — — — 2015 44/44 13.8 3.6 59.5% 78.7% 54.4% 64.0% 37.1% 68.9% 33.7%
28 — —/— — — — — — — — — — 2016 51/51 13.1 3.1 58.6% 79.9% 52.3% 59.4% 39.6% 68.5% 33.4%
29 — —/— — — — — — — — — — 2017 55/55 13.5 3.2 57.1% 79.8% 51.8% 62.5% 49.5% 67.9% 37.0%
30 — —/— — — — — — — — — — 2018 43/43 14.3 3.7 58.2% 81.9% 51.7% 60.0% 41.2% 69.3% 34.2%
31 — —/— — — — — — — — — — 2019 41/41 16.8 4.0 62.1% 81.2% 49.4% 60.5% 33.2% 69.1% 33.8%
32 — —/— — — — — — — — — — 2020 9/9 16.8 3.6 60.3% 78.2% 50.8% 33.4% 31.7% 67.5% 31.1%
33 — —/— — — — — — — — — — 2021 25/26 15.2 5.2 56.8% 81.9% 47.7% 52.4% 33.2% 67.3% 30.3%
34 — —/— — — — — — — — — — 2022 14/14 12.4 4.7 58.3% 78.6% 46.1% 56.3% 26.6% 64.8% 29.4%
Career — 35/35 2.6 4.3 62.0% 62.4% 43.9% 54.8% 38.2% 55.1% 35.3% — 684/688 12.9 3.5 59.0% 79.2% 50.9% 61.3% 40.2% 67.6% 34.5%

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 Sam Querrey
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 2005 1490 99.8 — — — — — — — — — — — — —
18 2016 1481 107.5 -3.43 +1.33 0.891 48.1% — — +119 54.5% +0.09 1–0 — — -0.03 2006 1542 124.2 +1.62 -2.01 0.962 49.2% -13 — — 46.7% -0.31 1–7 (13%) 2–4 (33%) — -0.03
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 2007 1637 141.5 +2.16 -1.29 0.990 50.0% +50 -158 — 47.6% -0.08 6–8 (43%) 9–10 (47%) — +0.09
20 2018 1528 106.2 +0.19 -0.20 0.570 40.2% — — — 0.0% -3.50 — — — -0.08 2008 1779 145.5 +1.02 -0.70 0.993 50.1% +29 -209 -254 51.5% +0.04 11–8 (58%) 9–8 (53%) — +0.64
21 2019 1514 100.9 — — — — — — — — — — — — — 2009 1900 149.0 +4.79 +0.01 1.176 52.3% +27 -361 -223 62.0% +0.61 8–11 (42%) 13–12 (52%) — +1.27
22 2020 1514 104.1 -1.24 +2.90 0.705 43.9% — — — 33.3% -2.33 0–1 1–0 — -0.06 2010 1873 152.2 +3.95 -0.55 1.108 51.9% +5 -250 +9 58.4% +0.58 13–11 (54%) 14–17 (45%) — +2.65
23 2021 1550 110.6 +2.69 +0.42 0.749 44.9% — — — 0.0% -3.00 — — — +0.04 2011 1817 141.7 +1.37 -1.06 0.989 49.9% +19 -173 +81 46.7% -0.10 3–4 (43%) 4–7 (36%) — +0.50
24 2022 1530 118.4 -4.38 +0.86 0.803 45.9% +20 — — 32.3% -1.48 2–0 1–1 — -0.54 2012 2006 157.4 +4.09 +0.39 1.129 52.1% +3 -305 -92 57.8% +0.40 12–10 (55%) 20–13 (61%) — -0.61
25 2023 1458 91.9 — — — — — — — — — — — — — 2013 1875 153.6 +2.58 -2.07 1.003 50.0% +71 -164 -51 50.0% -0.07 9–8 (53%) 15–15 (50%) — +0.18
26 2024 1433 92.7 — — — — — — — — — — — — — 2014 1896 144.5 +3.69 -2.25 1.080 51.0% +17 -178 -23 56.4% +0.33 6–9 (40%) 12–12 (50%) — +0.27
27 2025 1436 101.4 — — — — — — — — — — — — — 2015 1812 152.4 +3.52 -1.09 1.082 51.0% -39 -68 +110 46.7% -0.02 7–9 (44%) 13–18 (42%) — -2.68
28 2026 1418 97.5 — — — — — — — — — — — — — 2016 1797 152.8 +4.13 -1.97 1.060 50.9% -38 -84 +223 56.0% +0.27 8–9 (47%) 18–16 (53%) — +1.80
29 — — — — — — — — — — — — — — — — 2017 1945 161.8 +4.11 +1.06 1.153 52.3% -43 -192 +131 59.1% +0.70 11–6 (65%) 14–13 (52%) — +1.92
30 — — — — — — — — — — — — — — — — 2018 1823 152.3 +4.08 -0.93 1.114 51.7% -5 -127 +252 54.1% +0.58 6–11 (35%) 9–20 (31%) — +1.23
31 — — — — — — — — — — — — — — — — 2019 1898 146.9 +4.59 -1.49 1.095 51.3% -82 -158 +201 55.6% +0.20 5–5 (50%) 18–15 (55%) — -0.90
32 — — — — — — — — — — — — — — — — 2020 1818 128.8 +2.33 -0.47 0.956 48.3% -33 — — 37.0% -0.67 1–1 4–3 (57%) — -0.60
33 — — — — — — — — — — — — — — — — 2021 1690 124.0 +2.41 -3.84 0.926 48.7% -54 — +303 39.1% -0.53 3–5 (38%) 8–8 (50%) — -0.24
34 — — — — — — — — — — — — — — — — 2022 1645 117.4 -0.20 -3.77 0.835 47.4% -72 — +250 28.6% -0.97 2–1 (67%) 2–7 (22%) — +0.03
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 — 2039 155.6 +3.33 -1.02 1.064 51.0% 0 -181 +77 53.2% +0.22 112–123 (48%) 184–198 (48%) 96.0 +0.81

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.