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

Quentin Halys vs Stefan Kozlov H2H: 1-0

Quentin Halys holds a 1–0 lead over Stefan Kozlov in their ATP head-to-head. Across 1 main-draw meeting, Quentin Halys leads 1–0 on hard courts. Most recently, Quentin Halys won the 2017 Atlanta round of 32 7-5 7-6(7).

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

Quentin Halys
France Age 29 Right-Handed 191 cm / 6'3"
H2H
1 – 0
1 main draw meetings
Stefan Kozlov
United States Age 28 Right-Handed 183 cm / 6'0"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Quentin Halys #134 7-5 7-6(7) Stefan Kozlov #133 Match data Jul 27, 2017* R32 Atlanta 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
Quentin Halys #52 #46 1,174 1,834 67 102 39.6% 0 0 0 0 1 1
Stefan Kozlov #297 #103 558 1,673 9 26 25.7% 0 0 0 0 0 0

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 Quentin Halys Stefan Kozlov
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 2015 0–2 0.0% #205 1,519 0 0 2016 3–2 60.0% #116 1,481 0 0
19 2016 3–6 33.3% #153 1,560 0 0 2017 2–9 18.2% #167 1,549 0 0
20 2017 2–6 25.0% #129 1,562 0 0 2018 0–1 0.0% #316 1,528 0 0
21 2018 1–4 20.0% #128 1,552 0 0 — — — — — — —
22 2019 0–1 0.0% #220 1,514 0 0 2020 0–1 0.0% #371 1,514 0 0
23 2020 0–2 0.0% #203 1,529 0 0 2021 0–1 0.0% #159 1,550 0 0
24 2021 0–3 0.0% #151 1,557 0 0 2022 4–8 33.3% #198 1,529 0 0
25 2022 3–11 21.4% #64 1,618 0 0 — — — — — — —
26 2023 15–18 45.5% #100 1,677 0 0 — — — — — — —
27 2024 10–9 52.6% #72 1,792 0 0 — — — — — — —
28 2025 12–24 33.3% #91 1,621 0 0 — — — — — — —
29 2026 21–16 56.8% #52 1,812 0 1 — — — — — — —

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 Quentin Halys Stefan Kozlov
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 %
15 — — — — — — — — — — — — — 2013 — — — — — — — — 0 1 1 0.0%
16 — — — — — — — — — — — — — 2014 0 1 1 0.0% — — — — — — — —
17 — — — — — — — — — — — — — 2015 0 2 2 0.0% — — — — — — — —
18 2015 — — — — 0 2 2 0.0% — — — — 2016 — — — — — — — — 3 2 5 60.0%
19 2016 2 4 6 33.3% 1 2 3 33.3% — — — — 2017 0 6 6 0.0% — — — — 2 3 5 40.0%
20 2017 2 4 6 33.3% 0 2 2 0.0% — — — — 2018 — — — — 0 1 1 0.0% — — — —
21 2018 1 4 5 20.0% — — — — — — — — — — — — — — — — — — — — —
22 2019 — — — — 0 1 1 0.0% — — — — 2020 0 1 1 0.0% — — — — — — — —
23 2020 0 1 1 0.0% 0 1 1 0.0% — — — — 2021 0 1 1 0.0% — — — — — — — —
24 2021 0 3 3 0.0% — — — — — — — — 2022 4 6 10 40.0% — — — — 0 2 2 0.0%
25 2022 1 7 8 12.5% 0 1 1 0.0% 2 3 5 40.0% — — — — — — — — — — — — —
26 2023 9 13 22 40.9% 4 4 8 50.0% 2 1 3 66.7% — — — — — — — — — — — — —
27 2024 4 7 11 36.4% 4 1 5 80.0% 2 1 3 66.7% — — — — — — — — — — — — —
28 2025 7 16 23 30.4% 3 4 7 42.9% 2 4 6 33.3% — — — — — — — — — — — — —
29 2026 10 10 20 50.0% 9 3 12 75.0% 2 3 5 40.0% — — — — — — — — — — — — —
Career — 36 69 105 34.3% 21 21 42 50.0% 10 12 22 45.5% — 4 17 21 19.0% 0 1 1 0.0% 5 8 13 38.5%

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 168/170 of Quentin Halys's and 35/35 of Stefan Kozlov'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 Quentin Halys Stefan Kozlov
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 2015 2/2 8.0 3.0 65.5% 69.1% 48.2% 72.2% 25.0% 62.0% 25.1% 2016 5/5 4.2 4.8 55.8% 67.8% 41.9% 67.2% 40.4% 56.9% 38.4%
19 2016 9/9 10.1 6.0 62.1% 72.4% 42.5% 67.5% 37.3% 61.0% 31.2% 2017 11/11 3.6 4.1 58.0% 65.2% 44.1% 53.2% 35.0% 56.5% 32.9%
20 2017 8/8 11.0 6.5 57.5% 72.9% 51.5% 65.8% 37.7% 63.6% 31.4% 2018 1/1 2.0 5.0 50.9% 65.5% 35.7% 20.0% 50.0% 50.9% 28.0%
21 2018 5/5 12.0 8.8 57.9% 75.8% 40.7% 53.3% 34.6% 60.9% 37.6% — —/— — — — — — — — — —
22 2019 1/1 6.0 10.0 44.1% 63.4% 32.7% 57.9% 75.0% 46.2% 37.2% 2020 1/1 1.0 5.0 68.5% 54.1% 57.1% 36.4% 50.0% 55.1% 31.7%
23 2020 2/2 23.5 15.0 62.4% 73.6% 41.8% 58.3% 43.3% 61.9% 37.4% 2021 1/1 1.0 1.0 76.4% 54.8% 61.5% 42.9% 25.0% 56.4% 32.7%
24 2021 3/3 18.7 11.3 62.9% 76.3% 32.4% 68.1% 49.6% 60.4% 34.4% 2022 12/12 1.6 4.8 72.4% 60.0% 43.6% 59.6% 35.7% 55.2% 36.0%
25 2022 14/14 12.6 4.1 59.0% 79.1% 48.0% 61.6% 36.4% 66.6% 33.4% — —/— — — — — — — — — —
26 2023 33/33 13.5 4.1 59.4% 80.7% 51.8% 70.6% 42.2% 69.1% 32.3% — —/— — — — — — — — — —
27 2024 19/19 13.6 4.2 56.2% 81.2% 50.8% 67.4% 31.5% 68.0% 32.0% — —/— — — — — — — — — —
28 2025 35/36 11.6 4.6 59.1% 77.7% 49.1% 59.4% 31.6% 66.1% 30.5% — —/— — — — — — — — — —
29 2026 37/38 11.1 3.1 60.0% 77.5% 52.4% 64.2% 34.6% 67.4% 34.5% — —/— — — — — — — — — —
Career — 168/170 12.3 4.6 59.2% 77.9% 49.4% 64.6% 36.1% 66.3% 32.6% — 35/35 2.6 4.3 62.0% 62.4% 43.9% 54.8% 38.2% 55.1% 35.3%

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 Quentin Halys Stefan Kozlov
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 2013 1510 100.4 — — — — — — — — — — — — — 2014 1454 100.0 +0.67 0.00 0.813 45.3% — — — 0.0% -3.00 — — — -0.04
17 2014 1499 98.9 — — — — — — — — — — — — — 2015 1420 101.3 -5.76 -0.97 0.718 41.8% — — — 0.0% -3.50 — — — +0.21
18 2015 1519 116.4 +1.05 -0.97 0.660 44.0% — — — 0.0% -2.00 — 0–2 — -0.11 2016 1481 107.5 -3.43 +1.33 0.891 48.1% — — +119 54.5% +0.09 1–0 — — -0.03
19 2016 1560 132.1 -0.89 -2.36 0.801 47.1% -5 -21 — 36.0% -0.60 1–1 0–5 (0%) — -0.10 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
20 2017 1562 125.2 -1.19 -0.97 0.861 48.1% +12 — — 40.0% -0.65 0–2 6–2 (75%) — +0.08 2018 1528 106.2 +0.19 -0.20 0.570 40.2% — — — 0.0% -3.50 — — — -0.08
21 2018 1552 117.9 -0.94 -0.51 0.962 48.8% +39 — — 40.0% -0.53 0–3 (0%) 1–1 — +0.03 2019 1514 100.9 — — — — — — — — — — — — —
22 2019 1515 105.7 +2.46 +0.24 0.692 42.1% — — — 0.0% -3.00 — — — -0.15 2020 1514 104.1 -1.24 +2.90 0.705 43.9% — — — 33.3% -2.33 0–1 1–0 — -0.06
23 2020 1530 110.2 +0.30 -0.27 0.981 49.5% — — — 40.0% -0.10 0–2 1–2 (33%) — -0.01 2021 1550 110.6 +2.69 +0.42 0.749 44.9% — — — 0.0% -3.00 — — — +0.04
24 2021 1557 117.2 -0.79 -3.42 0.867 47.4% +24 — — 27.3% -0.73 0–2 0–1 — +0.23 2022 1530 118.4 -4.38 +0.86 0.803 45.9% +20 — — 32.3% -1.48 2–0 1–1 — -0.54
25 2022 1618 125.6 +0.03 -2.28 1.000 49.1% -17 — +23 36.6% -0.29 0–5 (0%) 2–8 (20%) — +0.34 2023 1458 91.9 — — — — — — — — — — — — —
26 2023 1678 147.3 +4.18 -2.11 1.043 50.5% -54 -116 -1 48.9% +0.22 4–8 (33%) 7–17 (29%) — -0.63 2024 1433 92.7 — — — — — — — — — — — — —
27 2024 1793 130.3 +1.97 -1.51 0.999 50.4% -88 -79 +14 50.0% +0.08 3–1 (75%) 7–6 (54%) — +0.35 2025 1436 101.4 — — — — — — — — — — — — —
28 2025 1622 136.4 +1.61 -3.37 0.901 48.4% -9 +94 +132 39.2% -0.65 5–9 (36%) 11–10 (52%) — -0.77 2026 1418 97.5 — — — — — — — — — — — — —
29 2026 1812 139.8 +2.21 -0.46 1.059 50.9% -28 +16 -129 54.7% +0.30 6–3 (67%) 15–12 (56%) — -0.22 — — — — — — — — — — — — — — — —
Career — 1834 138.5 +1.75 -1.84 0.968 49.5% -26 -15 +14 44.2% -0.19 19–36 (35%) 50–66 (43%) 91.7 -0.57 — 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

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.