Stefan Kozlov
all rivalries →| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Steve Johnson | 3 | 2 | 5 | Jul 14, 2022 | H2H |
| Sam Querrey | 0 | 2 | 2 | Aug 15, 2017 | H2H |
| Donald Young | 0 | 2 | 2 | Mar 11, 2017 | H2H |
| J.J. Wolf | 0 | 1 | 1 | Sep 22, 2022 | H2H |
| Daniil Medvedev | 0 | 1 | 1 | Aug 31, 2022 | H2H |
H2H data updated: 2026-09-02 00:00 UTC
Stefan Kozlov vs John-Patrick Smith
Compare the head-to-head record, career totals, season-by-season performance, and match log for Stefan Kozlov vs John-Patrick Smith.
Want to explore more matchups? Advanced rivalry search lets you browse current and historical rivalries, unbeaten records, or every matchup for a player.
H2H
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0 main draw meetings
H2H Match Log
| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| John-Patrick Smith | 6-2 6-3 | Stefan Kozlov | Match data | Jan 1, 2017* | Q1 | Brisbane International | ATP 250 | Hard |
1 qualifying meeting shown in the table; qualifying is excluded from the H2H score. 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 |
| John-Patrick Smith | #1,551 | #108 | 490 | 1,687 | 5 | 22 | 18.5% | 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 | Stefan Kozlov | John-Patrick Smith | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | W-L | Win % | Rank | Elo | GS | Titles | Yr | W-L | Win % | Rank | Elo | GS | Titles | |
| 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 | — | — | — | — | — | — | — |
| 23 | 2021 | 0–1 | 0.0% | #159 | 1,550 | 0 | 0 | — | — | — | — | — | — | — |
| 24 | 2022 | 4–8 | 33.3% | #198 | 1,529 | 0 | 0 | 2013 | 0–1 | 0.0% | #221 | 1,473 | 0 | 0 |
| 25 | — | — | — | — | — | — | — | 2014 | 0–2 | 0.0% | #201 | 1,492 | 0 | 0 |
| 26 | — | — | — | — | — | — | — | 2015 | 3–5 | 37.5% | #129 | 1,619 | 0 | 0 |
| 27 | — | — | — | — | — | — | — | 2016 | 2–4 | 33.3% | #226 | 1,605 | 0 | 0 |
| 28 | — | — | — | — | — | — | — | 2017 | 0–3 | 0.0% | #219 | 1,650 | 0 | 0 |
| 29 | — | — | — | — | — | — | — | 2018 | 0–4 | 0.0% | #193 | 1,615 | 0 | 0 |
| 31 | — | — | — | — | — | — | — | 2020 | 0–1 | 0.0% | #313 | 1,535 | 0 | 0 |
| 32 | — | — | — | — | — | — | — | 2021 | 0–2 | 0.0% | #394 | 1,505 | 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 | Stefan Kozlov | John-Patrick Smith | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yr | Hard | Clay | Grass | Yr | Hard | Clay | Grass | |||||||||||||||||||
| 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% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 23 | 2021 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 24 | 2022 | 4 | 6 | 10 | 40.0% | — | — | — | — | 0 | 2 | 2 | 0.0% | 2013 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 25 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2014 | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — |
| 26 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2015 | 0 | 3 | 3 | 0.0% | — | — | — | — | 3 | 2 | 5 | 60.0% |
| 27 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2016 | 1 | 3 | 4 | 25.0% | — | — | — | — | 1 | 1 | 2 | 50.0% |
| 28 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2017 | 0 | 3 | 3 | 0.0% | — | — | — | — | — | — | — | — |
| 29 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2018 | 0 | 2 | 2 | 0.0% | — | — | — | — | 0 | 2 | 2 | 0.0% |
| 31 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2020 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 32 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2021 | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — |
| Career | — | 4 | 17 | 21 | 19.0% | 0 | 1 | 1 | 0.0% | 5 | 8 | 13 | 38.5% | — | 1 | 17 | 18 | 5.6% | — | — | — | — | 4 | 5 | 9 | 44.4% |
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 | Stefan Kozlov | John-Patrick Smith | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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% | — | —/— | — | — | — | — | — | — | — | — | — |
| 23 | 2021 | 1/1 | 1.0 | 1.0 | 76.4% | 54.8% | 61.5% | 42.9% | 25.0% | 56.4% | 32.7% | — | —/— | — | — | — | — | — | — | — | — | — |
| 24 | 2022 | 12/12 | 1.6 | 4.8 | 72.4% | 60.0% | 43.6% | 59.6% | 35.7% | 55.2% | 36.0% | 2013 | 1/1 | 2.0 | 1.0 | 59.8% | 55.1% | 51.5% | 68.4% | 25.0% | 53.7% | 33.0% |
| 25 | — | —/— | — | — | — | — | — | — | — | — | — | 2014 | 2/2 | 3.5 | 2.5 | 59.1% | 69.7% | 47.4% | 55.7% | 33.3% | 60.6% | 26.7% |
| 26 | — | —/— | — | — | — | — | — | — | — | — | — | 2015 | 8/8 | 9.3 | 2.4 | 60.5% | 75.7% | 52.3% | 51.9% | 39.4% | 65.4% | 35.5% |
| 27 | — | —/— | — | — | — | — | — | — | — | — | — | 2016 | 6/6 | 4.8 | 2.3 | 66.4% | 67.1% | 50.7% | 47.3% | 55.6% | 61.7% | 33.3% |
| 28 | — | —/— | — | — | — | — | — | — | — | — | — | 2017 | 3/3 | 5.3 | 2.7 | 66.1% | 64.0% | 57.1% | 61.7% | 27.6% | 61.3% | 35.0% |
| 29 | — | —/— | — | — | — | — | — | — | — | — | — | 2018 | 4/4 | 5.5 | 0.5 | 69.6% | 61.7% | 53.7% | 17.5% | 50.0% | 59.2% | 29.6% |
| 31 | — | —/— | — | — | — | — | — | — | — | — | — | 2020 | 1/1 | 8.0 | 1.0 | 71.7% | 64.8% | 46.4% | 60.0% | 33.3% | 59.6% | 25.0% |
| 32 | — | —/— | — | — | — | — | — | — | — | — | — | 2021 | 2/2 | 4.5 | 0.5 | 74.6% | 66.1% | 47.9% | 30.6% | 22.4% | 59.9% | 36.6% |
| Career | — | 35/35 | 2.6 | 4.3 | 62.0% | 62.4% | 43.9% | 54.8% | 38.2% | 55.1% | 35.3% | — | 27/27 | 6.2 | 1.9 | 65.1% | 68.1% | 51.7% | 46.5% | 40.8% | 61.8% | 33.0% |
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 | John-Patrick Smith | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 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 | 2018 | 1528 | 106.2 | +0.19 | -0.20 | 0.570 | 40.2% | — | — | — | 0.0% | -3.50 | — | — | — | -0.08 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 23 | 2021 | 1550 | 110.6 | +2.69 | +0.42 | 0.749 | 44.9% | — | — | — | 0.0% | -3.00 | — | — | — | +0.04 | 2012 | 1475 | 100.6 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 24 | 2022 | 1530 | 118.4 | -4.38 | +0.86 | 0.803 | 45.9% | +20 | — | — | 32.3% | -1.48 | 2–0 | 1–1 | — | -0.54 | 2013 | 1473 | 101.2 | -1.27 | -3.02 | 0.711 | 42.9% | — | — | — | 0.0% | -3.00 | — | — | — | +0.17 |
| 25 | 2023 | 1458 | 91.9 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2014 | 1492 | 104.2 | -1.77 | -2.76 | 0.679 | 45.0% | — | — | — | 0.0% | -2.00 | — | — | — | +0.15 |
| 26 | 2024 | 1433 | 92.7 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2015 | 1619 | 123.3 | -0.99 | -0.14 | 1.025 | 50.5% | -24 | — | +99 | 40.9% | -0.09 | 1–1 | 0–4 (0%) | — | +0.70 |
| 27 | 2025 | 1436 | 101.4 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2016 | 1605 | 118.3 | -2.79 | +0.56 | 0.870 | 47.8% | +6 | — | — | 40.0% | -0.53 | 1–2 (33%) | — | — | +0.29 |
| 28 | 2026 | 1418 | 97.5 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2017 | 1651 | 120.3 | -0.12 | -2.25 | 0.906 | 48.2% | +29 | — | — | 12.5% | -1.00 | — | 0–3 (0%) | — | +0.25 |
| 29 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2018 | 1616 | 113.1 | -1.40 | -1.59 | 0.727 | 44.5% | — | — | — | 10.0% | -2.10 | 0–1 | — | — | -0.59 |
| 30 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2019 | 1553 | 105.8 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 31 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2020 | 1536 | 98.8 | -0.66 | -1.86 | 0.619 | 43.7% | — | — | — | 0.0% | -2.33 | — | — | — | -0.08 |
| 32 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2021 | 1505 | 113.4 | -2.44 | -3.19 | 0.913 | 46.8% | — | — | — | 33.3% | -1.50 | 0–2 | — | — | -0.13 |
| 33 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2022 | 1476 | 98.6 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 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 | — | 1687 | 117.9 | -1.52 | -1.02 | 0.865 | 47.5% | +4 | — | +99 | 26.8% | -1.01 | 2–6 (25%) | 0–7 (0%) | 90.0 | +2.81 |
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.
John-Patrick Smith
all rivalries →| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Mikhail Youzhny | 0 | 2 | 2 | Sep 21, 2017 | H2H |
| Radu Albot | 0 | 1 | 1 | Feb 25, 2021 | H2H |
| Tennys Sandgren | 0 | 1 | 1 | Feb 3, 2021 | H2H |
| Guido Pella | 0 | 1 | 1 | Jan 22, 2020 | H2H |
| Andreas Seppi | 0 | 1 | 1 | Jul 4, 2018 | H2H |