H2H data updated: 2026-09-02 00:00 UTC

Alex Bolt vs Stefan Kozlov

Compare the head-to-head record, career totals, season-by-season performance, and match log for Alex Bolt vs Stefan Kozlov.

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Alex Bolt
Australia Age 33 Left-Handed 183 cm / 6'0"
H2H
0 – 0
0 main draw meetings
Stefan Kozlov
United States Age 28 Right-Handed 183 cm / 6'0"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Stefan Kozlov #367 4-6 6-4 6-2 Alex Bolt #136 Match data Feb 17, 2020 Q1 Q Delray Beach Open ATP 250 Hard

1 qualifying meeting shown in the table; qualifying is excluded from the H2H score. 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
Alex Bolt #164 #125 564 1,726 18 34 34.6% 0 0 0 0 0 0
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 Alex Bolt 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 — — — — — — — 2016 3–2 60.0% #116 1,481 0 0
19 — — — — — — — 2017 2–9 18.2% #167 1,549 0 0
20 — — — — — — — 2018 0–1 0.0% #316 1,528 0 0
22 2015 0–1 0.0% #269 1,461 0 0 2020 0–1 0.0% #371 1,514 0 0
23 — — — — — — — 2021 0–1 0.0% #159 1,550 0 0
24 2017 0–2 0.0% #189 1,529 0 0 2022 4–8 33.3% #198 1,529 0 0
25 2018 1–7 12.5% #154 1,611 0 0 — — — — — — —
26 2019 3–4 42.9% #159 1,583 0 0 — — — — — — —
27 2020 3–3 50.0% #171 1,604 0 0 — — — — — — —
28 2021 6–6 50.0% #137 1,679 0 0 — — — — — — —
29 2022 0–3 0.0% #636 1,607 0 0 — — — — — — —
30 2023 1–2 33.3% #329 1,601 0 0 — — — — — — —
31 2024 3–3 50.0% #157 1,672 0 0 — — — — — — —
32 2025 0–2 0.0% #171 1,640 0 0 — — — — — — —
33 2026 1–1 50.0% #164 1,566 0 0 — — — — — — —

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 Alex Bolt 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 — — — — — — — — — — — — — 2016 — — — — — — — — 3 2 5 60.0%
19 — — — — — — — — — — — — — 2017 0 6 6 0.0% — — — — 2 3 5 40.0%
20 — — — — — — — — — — — — — 2018 — — — — 0 1 1 0.0% — — — —
22 2015 0 1 1 0.0% — — — — — — — — 2020 0 1 1 0.0% — — — — — — — —
23 — — — — — — — — — — — — — 2021 0 1 1 0.0% — — — — — — — —
24 2017 0 2 2 0.0% — — — — — — — — 2022 4 6 10 40.0% — — — — 0 2 2 0.0%
25 2018 0 4 4 0.0% — — — — 1 3 4 25.0% — — — — — — — — — — — — —
26 2019 3 3 6 50.0% — — — — 0 1 1 0.0% — — — — — — — — — — — — —
27 2020 3 3 6 50.0% — — — — — — — — — — — — — — — — — — — — —
28 2021 5 4 9 55.6% — — — — 1 2 3 33.3% — — — — — — — — — — — — —
29 2022 0 3 3 0.0% — — — — — — — — — — — — — — — — — — — — —
30 2023 1 1 2 50.0% — — — — 0 1 1 0.0% — — — — — — — — — — — — —
31 2024 1 1 2 50.0% — — — — 2 2 4 50.0% — — — — — — — — — — — — —
32 2025 — — — — — — — — 0 2 2 0.0% — — — — — — — — — — — — —
33 2026 — — — — 1 1 2 50.0% — — — — — — — — — — — — — — — — —
Career — 13 22 35 37.1% 1 1 2 50.0% 4 11 15 26.7% — 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. 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 Alex Bolt 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 — —/— — — — — — — — — — 2016 5/5 4.2 4.8 55.8% 67.8% 41.9% 67.2% 40.4% 56.9% 38.4%
19 — —/— — — — — — — — — — 2017 11/11 3.6 4.1 58.0% 65.2% 44.1% 53.2% 35.0% 56.5% 32.9%
20 — —/— — — — — — — — — — 2018 1/1 2.0 5.0 50.9% 65.5% 35.7% 20.0% 50.0% 50.9% 28.0%
22 2015 1/1 3.0 4.0 66.1% 64.1% 50.0% 57.1% 0.0% 59.3% 30.4% 2020 1/1 1.0 5.0 68.5% 54.1% 57.1% 36.4% 50.0% 55.1% 31.7%
23 — —/— — — — — — — — — — 2021 1/1 1.0 1.0 76.4% 54.8% 61.5% 42.9% 25.0% 56.4% 32.7%
24 2017 2/2 12.5 3.5 60.1% 65.5% 41.2% 25.0% 27.7% 55.8% 38.0% 2022 12/12 1.6 4.8 72.4% 60.0% 43.6% 59.6% 35.7% 55.2% 36.0%
25 2018 8/8 9.3 3.6 59.6% 71.1% 48.2% 56.9% 27.9% 61.7% 28.5% — —/— — — — — — — — — —
26 2019 7/7 8.6 2.6 55.9% 71.3% 49.5% 56.6% 54.0% 61.9% 35.1% — —/— — — — — — — — — —
27 2020 6/6 8.0 2.8 63.6% 68.9% 53.3% 58.4% 30.0% 63.2% 31.9% — —/— — — — — — — — — —
28 2021 12/12 5.3 2.7 60.5% 69.0% 50.4% 52.1% 45.9% 61.7% 34.5% — —/— — — — — — — — — —
29 2022 3/3 6.7 3.3 62.9% 69.0% 46.0% 49.3% 15.0% 59.8% 33.6% — —/— — — — — — — — — —
30 2023 3/3 6.0 2.7 54.3% 81.6% 54.4% 40.0% 42.2% 69.1% 35.9% — —/— — — — — — — — — —
31 2024 6/6 6.7 1.8 63.8% 71.6% 52.5% 48.7% 23.0% 64.3% 35.6% — —/— — — — — — — — — —
32 2025 2/2 5.5 3.5 65.0% 71.5% 49.0% 35.5% 25.0% 63.5% 27.5% — —/— — — — — — — — — —
33 2026 2/2 5.0 2.5 57.5% 71.0% 53.5% 69.0% 50.0% 63.5% 32.0% — —/— — — — — — — — — —
Career — 52/52 7.2 2.8 60.4% 70.6% 50.2% 52.0% 35.5% 62.4% 33.2% — 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 Alex Bolt 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 — — — — — — — — — — — — — — — — 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
18 — — — — — — — — — — — — — — — — 2016 1481 107.5 -3.43 +1.33 0.891 48.1% — — +119 54.5% +0.09 1–0 — — -0.03
19 2012 1483 99.2 — — — — — — — — — — — — — 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 2013 1463 100.4 — — — — — — — — — — — — — 2018 1528 106.2 +0.19 -0.20 0.570 40.2% — — — 0.0% -3.50 — — — -0.08
21 2014 1463 103.3 — — — — — — — — — — — — — 2019 1514 100.9 — — — — — — — — — — — — —
22 2015 1461 105.5 -1.84 -2.69 0.746 45.2% — — — 0.0% -3.00 — — — +0.13 2020 1514 104.1 -1.24 +2.90 0.705 43.9% — — — 33.3% -2.33 0–1 1–0 — -0.06
23 2016 1454 102.3 — — — — — — — — — — — — — 2021 1550 110.6 +2.69 +0.42 0.749 44.9% — — — 0.0% -3.00 — — — +0.04
24 2017 1530 117.2 -0.32 -2.19 0.859 46.2% — — — 16.7% -1.50 — — — +0.06 2022 1530 118.4 -4.38 +0.86 0.803 45.9% +20 — — 32.3% -1.48 2–0 1–1 — -0.54
25 2018 1612 111.9 -2.04 -3.80 0.743 46.1% -32 — +78 29.2% -1.25 1–4 (20%) 2–1 (67%) — +0.31 2023 1458 91.9 — — — — — — — — — — — — —
26 2019 1583 112.5 -0.72 -0.94 0.922 48.8% +3 — — 43.5% -0.22 2–2 (50%) 1–2 (33%) — +0.27 2024 1433 92.7 — — — — — — — — — — — — —
27 2020 1605 116.7 +0.12 -1.03 0.868 47.8% +14 — — 47.4% -0.63 2–1 (67%) 2–2 (50%) — -0.25 2025 1436 101.4 — — — — — — — — — — — — —
28 2021 1679 125.6 -1.17 -0.10 0.901 48.4% -2 — +5 47.1% -0.26 3–2 (60%) 1–4 (20%) — -0.57 2026 1418 97.5 — — — — — — — — — — — — —
29 2022 1608 107.1 -1.86 -1.98 0.837 46.0% -17 — — 0.0% -2.57 — — — +0.06 — — — — — — — — — — — — — — — —
30 2023 1601 112.2 +0.23 +0.72 1.160 51.7% — — — 20.0% -1.00 0–1 — — -0.27 — — — — — — — — — — — — — — — —
31 2024 1673 118.1 +0.55 +0.78 1.000 49.6% — — +100 46.2% -0.23 — 1–1 — -0.37 — — — — — — — — — — — — — — — —
32 2025 1640 105.1 -1.04 -1.03 0.753 45.5% — — — 0.0% -2.00 — 0–2 — -0.06 — — — — — — — — — — — — — — — —
33 2026 1566 99.6 -0.86 +0.02 0.877 49.0% — — — 60.0% -0.60 0–1 2–0 — -0.36 — — — — — — — — — — — — — — — —
Career — 1727 117.7 -0.82 -1.01 0.883 48.0% -3 — +66 37.1% -0.77 8–11 (42%) 9–12 (43%) 100.7 -2.02 — 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.