H2H data updated: 2026-09-05 00:00 UTC

Stefan Kozlov vs Guido Pella H2H: 0-1

Guido Pella holds a 1–0 lead over Stefan Kozlov in their ATP head-to-head. Across 1 main-draw meeting, Guido Pella leads 1–0 on clay. Most recently, Guido Pella won the 2018 U.S. Men's Clay Court Championship first round 6-3 6-2.

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

Stefan Kozlov
United States Age 28 Right-Handed 183 cm / 6'0"
H2H
0 – 1
1 main draw meetings
Guido Pella
ARG Age 36 Left-Handed 183 cm / 6'0"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Guido Pella #63 6-3 6-2 Stefan Kozlov #184 Match data Apr 12, 2018* R32 U.S. Men's Clay Court Championship ATP 250 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 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
Guido Pella #1,079 #20 1,735 1,948 118 144 45.0% 0 0 0 0 1 1

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 Guido Pella
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 2020 0–1 0.0% #371 1,514 0 0 2012 0–1 0.0% #97 1,538 0 0
23 2021 0–1 0.0% #159 1,550 0 0 2013 7–13 35.0% #118 1,642 0 0
24 2022 4–8 33.3% #198 1,529 0 0 2014 3–4 42.9% #155 1,606 0 0
25 — — — — — — — 2015 1–4 20.0% #74 1,655 0 0
26 — — — — — — — 2016 14–22 38.9% #80 1,689 0 0
27 — — — — — — — 2017 16–15 51.6% #64 1,802 0 0
28 — — — — — — — 2018 23–22 51.1% #58 1,753 0 0
29 — — — — — — — 2019 34–25 57.6% #25 1,842 0 1
30 — — — — — — — 2020 5–8 38.5% #43 1,762 0 1
31 — — — — — — — 2021 6–17 26.1% #74 1,691 0 1
33 — — — — — — — 2023 9–13 40.9% #192 1,666 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 Stefan Kozlov Guido Pella
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 2020 0 1 1 0.0% — — — — — — — — 2012 0 1 1 0.0% — — — — — — — —
23 2021 0 1 1 0.0% — — — — — — — — 2013 2 5 7 28.6% 5 6 11 45.5% 0 2 2 0.0%
24 2022 4 6 10 40.0% — — — — 0 2 2 0.0% 2014 1 2 3 33.3% 2 2 4 50.0% — — — —
25 — — — — — — — — — — — — — 2015 1 3 4 25.0% 0 1 1 0.0% — — — —
26 — — — — — — — — — — — — — 2016 5 10 15 33.3% 9 10 19 47.4% 0 2 2 0.0%
27 — — — — — — — — — — — — — 2017 10 10 20 50.0% 6 5 11 54.5% — — — —
28 — — — — — — — — — — — — — 2018 6 9 15 40.0% 13 10 23 56.5% 4 3 7 57.1%
29 — — — — — — — — — — — — — 2019 9 13 22 40.9% 21 9 30 70.0% 4 3 7 57.1%
30 — — — — — — — — — — — — — 2020 2 2 4 50.0% 3 6 9 33.3% — — — —
31 — — — — — — — — — — — — — 2021 4 6 10 40.0% 2 7 9 22.2% 0 4 4 0.0%
33 — — — — — — — — — — — — — 2023 2 4 6 33.3% 4 7 11 36.4% 3 2 5 60.0%
Career — 4 17 21 19.0% 0 1 1 0.0% 5 8 13 38.5% — 42 65 107 39.3% 65 63 128 50.8% 11 16 27 40.7%

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 260/262 of Guido Pella'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 Guido Pella
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 2020 1/1 1.0 5.0 68.5% 54.1% 57.1% 36.4% 50.0% 55.1% 31.7% 2012 1/1 2.0 6.0 65.1% 60.7% 37.8% 42.9% 41.7% 52.7% 39.8%
23 2021 1/1 1.0 1.0 76.4% 54.8% 61.5% 42.9% 25.0% 56.4% 32.7% 2013 20/20 3.8 2.9 57.5% 66.0% 47.0% 45.5% 34.7% 57.6% 32.3%
24 2022 12/12 1.6 4.8 72.4% 60.0% 43.6% 59.6% 35.7% 55.2% 36.0% 2014 7/7 4.7 1.9 60.1% 72.3% 52.6% 67.1% 43.7% 64.8% 30.9%
25 — —/— — — — — — — — — — 2015 5/5 5.6 3.2 68.3% 70.8% 47.9% 69.0% 52.8% 63.5% 31.1%
26 — —/— — — — — — — — — — 2016 35/36 5.4 2.9 67.7% 68.9% 54.4% 65.4% 36.1% 64.3% 36.6%
27 — —/— — — — — — — — — — 2017 31/31 4.8 2.4 65.4% 69.4% 51.4% 66.0% 39.7% 63.1% 38.5%
28 — —/— — — — — — — — — — 2018 45/45 6.4 1.9 64.6% 70.9% 53.4% 59.0% 37.4% 64.6% 37.8%
29 — —/— — — — — — — — — — 2019 58/59 4.9 2.2 66.5% 68.1% 54.0% 59.8% 39.8% 63.4% 38.0%
30 — —/— — — — — — — — — — 2020 13/13 4.5 3.4 65.9% 68.0% 50.6% 54.8% 35.2% 61.9% 36.1%
31 — —/— — — — — — — — — — 2021 23/23 4.4 2.7 66.1% 61.8% 42.6% 55.0% 49.7% 55.5% 37.3%
33 — —/— — — — — — — — — — 2023 22/22 3.3 2.7 67.9% 66.5% 52.0% 58.4% 37.8% 61.7% 34.7%
Career — 35/35 2.6 4.3 62.0% 62.4% 43.9% 54.8% 38.2% 55.1% 35.3% — 260/262 4.9 2.5 65.4% 68.1% 51.5% 59.6% 39.3% 62.3% 36.6%

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 Guido Pella
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 2007 1507 96.7 — — — — — — — — — — — — —
18 2016 1481 107.5 -3.43 +1.33 0.891 48.1% — — +119 54.5% +0.09 1–0 — — -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%) 100.1 +0.21 2009 1491 98.0 — — — — — — — — — — — — —
20 2018 1528 106.2 +0.19 -0.20 0.570 40.2% — — — 0.0% -3.50 — — — -0.08 2010 1494 102.6 — — — — — — — — — — — — —
21 2019 1514 100.9 — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
22 2020 1514 104.1 -1.24 +2.90 0.705 43.9% — — — 33.3% -2.33 0–1 1–0 — -0.06 2012 1539 110.6 +0.61 -1.90 0.842 46.7% — — — 25.0% -1.25 — — — -0.05
23 2021 1550 110.6 +2.69 +0.42 0.749 44.9% — — — 0.0% -3.00 — — — +0.04 2013 1642 131.3 -2.91 -2.48 0.762 45.6% -26 +48 — 32.6% -1.43 3–1 (75%) 5–5 (50%) 106.1 -0.64
24 2022 1530 118.4 -4.38 +0.86 0.803 45.9% +20 — — 32.3% -1.48 2–0 1–1 — -0.54 2014 1606 118.6 +0.41 -1.48 0.878 48.0% -15 +90 — 43.8% -0.69 1–1 3–2 (60%) — -0.04
25 2023 1458 91.9 — — — — — — — — — — — — — 2015 1655 120.5 -0.42 -0.06 0.852 47.9% +3 — — 23.1% -0.69 1–1 0–5 (0%) — -0.41
26 2024 1433 92.7 — — — — — — — — — — — — — 2016 1690 147.1 +0.77 +0.51 1.023 50.5% -21 +15 — 43.0% -0.13 7–12 (37%) 7–16 (30%) 92.7 -1.08
27 2025 1436 101.4 — — — — — — — — — — — — — 2017 1802 149.2 -0.11 +1.80 1.043 50.8% -42 +6 — 52.5% +0.14 5–8 (38%) 11–9 (55%) 101.8 -0.90
28 2026 1418 97.5 — — — — — — — — — — — — — 2018 1754 143.3 +0.84 +1.15 1.066 50.8% -73 +104 -89 50.0% +0.05 10–8 (56%) 9–11 (45%) 102.0 -0.37
29 — — — — — — — — — — — — — — — — 2019 1843 153.6 -0.25 +1.74 1.038 50.6% -140 +100 -43 54.1% +0.18 16–8 (67%) 17–8 (68%) 110.8 +0.93
30 — — — — — — — — — — — — — — — — 2020 1763 121.2 -1.57 -0.69 0.948 49.1% -67 +50 — 43.6% -0.31 1–3 (25%) 4–6 (40%) 95.3 -0.02
31 — — — — — — — — — — — — — — — — 2021 1691 134.0 -5.10 +0.25 0.838 46.9% +29 +26 +12 33.3% -1.08 1–3 (25%) 3–5 (38%) 96.2 -1.34
33 — — — — — — — — — — — — — — — — 2023 1666 121.1 -2.21 -0.99 0.906 48.3% +3 -11 +77 39.1% -0.52 6–3 (67%) 4–7 (36%) 100.0 +0.80
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 — 1948 145.9 -0.76 +0.54 0.972 49.5% -52 +57 -21 45.7% -0.23 51–48 (52%) 63–74 (46%) 101.6 -1.20

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.