H2H data updated: 2026-09-02 00:00 UTC
Compare the head-to-head record, career totals, season-by-season performance, and match log for Zachary Svajda vs Stefan Kozlov.
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| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Zachary Svajda | 7-5 6-1 | Stefan Kozlov | Match data | Jul 25, 2026 | Q1 | Washington Open | ATP 500 | Hard |
| Zachary Svajda | 6-3 6-0 | Stefan Kozlov | Match data | Feb 10, 2025* | Q1 | Delray Beach Open | ATP 250 | Hard |
| Zachary Svajda | 6-3 6-4 | Stefan Kozlov | Match data | Feb 6, 2023 | Q2 | Dallas Open | ATP 250 | Hard |
3 qualifying meetings 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.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zachary Svajda | #80 | #62 | 875 | 1,749 | 18 | 32 | 36.0% | 0 | 0 | 0 | 0 | 0 | 0 |
| Stefan Kozlov | #297 | #103 | 558 | 1,673 | 9 | 26 | 25.7% | 0 | 0 | 0 | 0 | 0 | 0 |
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 | Zachary Svajda | Stefan Kozlov | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 2019 | 0–1 | 0.0% | #914 | 1,481 | 0 | 0 | 2014 | 0–1 | 0.0% | #467 | 1,453 | 0 | 0 |
| 17 | — | — | — | — | — | — | — | 2015 | 0–2 | 0.0% | #351 | 1,420 | 0 | 0 |
| 18 | 2021 | 1–2 | 33.3% | #389 | 1,499 | 0 | 0 | 2016 | 3–2 | 60.0% | #116 | 1,481 | 0 | 0 |
| 19 | 2022 | 0–1 | 0.0% | #301 | 1,490 | 0 | 0 | 2017 | 2–9 | 18.2% | #167 | 1,549 | 0 | 0 |
| 20 | 2023 | 1–3 | 25.0% | #142 | 1,595 | 0 | 0 | 2018 | 0–1 | 0.0% | #316 | 1,528 | 0 | 0 |
| 21 | 2024 | 4–9 | 30.8% | #166 | 1,603 | 0 | 0 | — | — | — | — | — | — | — |
| 22 | 2025 | 2–3 | 40.0% | #143 | 1,663 | 0 | 0 | 2020 | 0–1 | 0.0% | #371 | 1,514 | 0 | 0 |
| 23 | 2026 | 10–13 | 43.5% | #80 | 1,689 | 0 | 0 | 2021 | 0–1 | 0.0% | #159 | 1,550 | 0 | 0 |
| 24 | — | — | — | — | — | — | — | 2022 | 4–8 | 33.3% | #198 | 1,529 | 0 | 0 |
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 | Zachary Svajda | Stefan Kozlov | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 2019 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 2014 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 17 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2015 | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — |
| 18 | 2021 | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — | 2016 | — | — | — | — | — | — | — | — | 3 | 2 | 5 | 60.0% |
| 19 | 2022 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 2017 | 0 | 6 | 6 | 0.0% | — | — | — | — | 2 | 3 | 5 | 40.0% |
| 20 | 2023 | 1 | 3 | 4 | 25.0% | — | — | — | — | — | — | — | — | 2018 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — |
| 21 | 2024 | 4 | 8 | 12 | 33.3% | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 22 | 2025 | 2 | 3 | 5 | 40.0% | — | — | — | — | — | — | — | — | 2020 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 23 | 2026 | 4 | 8 | 12 | 33.3% | 4 | 3 | 7 | 57.1% | 2 | 2 | 4 | 50.0% | 2021 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — |
| 24 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2022 | 4 | 6 | 10 | 40.0% | — | — | — | — | 0 | 2 | 2 | 0.0% |
| Career | — | 12 | 26 | 38 | 31.6% | 4 | 3 | 7 | 57.1% | 2 | 3 | 5 | 40.0% | — | 4 | 17 | 21 | 19.0% | 0 | 1 | 1 | 0.0% | 5 | 8 | 13 | 38.5% |
Seasons are aligned by the age each player spent most of that calendar year. Detailed serve and return statistics available for 49/52 of Zachary Svajda'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 | Zachary Svajda | 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 | 2019 | 1/1 | 2.0 | 3.0 | 73.2% | 56.7% | 55.1% | 55.0% | 43.8% | 56.3% | 38.4% | 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 | 2021 | 3/3 | 6.0 | 3.0 | 61.7% | 70.5% | 45.9% | 49.2% | 30.0% | 61.1% | 32.8% | 2016 | 5/5 | 4.2 | 4.8 | 55.8% | 67.8% | 41.9% | 67.2% | 40.4% | 56.9% | 38.4% |
| 19 | 2022 | 1/1 | 0.0 | 0.0 | 72.2% | 60.0% | 56.0% | 42.9% | 42.9% | 58.9% | 31.9% | 2017 | 11/11 | 3.6 | 4.1 | 58.0% | 65.2% | 44.1% | 53.2% | 35.0% | 56.5% | 32.9% |
| 20 | 2023 | 4/4 | 5.5 | 1.3 | 61.9% | 67.5% | 46.5% | 35.0% | 16.8% | 59.4% | 33.3% | 2018 | 1/1 | 2.0 | 5.0 | 50.9% | 65.5% | 35.7% | 20.0% | 50.0% | 50.9% | 28.0% |
| 21 | 2024 | 13/13 | 3.3 | 2.5 | 65.2% | 66.6% | 52.3% | 55.8% | 43.7% | 61.2% | 36.5% | — | —/— | — | — | — | — | — | — | — | — | — |
| 22 | 2025 | 5/5 | 9.6 | 2.4 | 61.2% | 69.8% | 47.2% | 48.8% | 57.4% | 60.8% | 36.4% | 2020 | 1/1 | 1.0 | 5.0 | 68.5% | 54.1% | 57.1% | 36.4% | 50.0% | 55.1% | 31.7% |
| 23 | 2026 | 22/25 | 8.3 | 2.8 | 61.9% | 72.0% | 48.2% | 53.1% | 33.2% | 62.9% | 31.8% | 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% |
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 | Zachary Svajda | 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 | 2019 | 1481 | 102.8 | -3.98 | -0.19 | 0.879 | 47.8% | — | — | — | 40.0% | -0.60 | 0–1 | 1–1 | — | +0.22 | 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 | 2021 | 1500 | 108.9 | -0.11 | -1.57 | 0.842 | 46.6% | +16 | — | — | 40.0% | -1.00 | — | 2–1 (67%) | — | +0.03 | 2016 | 1481 | 107.5 | -3.43 | +1.33 | 0.891 | 48.1% | — | — | +119 | 54.5% | +0.09 | 1–0 | — | — | -0.03 |
| 19 | 2022 | 1491 | 104.1 | -1.22 | +2.81 | 0.777 | 46.9% | — | — | — | 0.0% | -1.50 | — | 0–1 | — | -0.12 | 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 | 2023 | 1596 | 115.1 | -0.26 | -0.26 | 0.821 | 45.7% | +29 | — | — | 27.3% | -1.46 | 1–0 | 1–0 | — | +0.13 | 2018 | 1528 | 106.2 | +0.19 | -0.20 | 0.570 | 40.2% | — | — | — | 0.0% | -3.50 | — | — | — | -0.08 |
| 21 | 2024 | 1603 | 121.1 | -2.34 | -0.98 | 0.941 | 49.2% | +49 | — | — | 39.4% | -0.79 | 1–5 (17%) | 2–3 (40%) | — | +0.02 | 2019 | 1514 | 100.9 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 22 | 2025 | 1664 | 129.6 | -0.51 | +1.24 | 0.929 | 49.2% | +28 | — | — | 46.7% | -0.47 | 1–1 | 2–0 | — | -0.24 | 2020 | 1514 | 104.1 | -1.24 | +2.90 | 0.705 | 43.9% | — | — | — | 33.3% | -2.33 | 0–1 | 1–0 | — | -0.06 |
| 23 | 2026 | 1690 | 131.5 | -0.97 | -2.81 | 0.857 | 48.0% | -3 | -91 | -39 | 43.9% | -0.41 | 4–3 (57%) | 5–8 (38%) | — | -0.16 | 2021 | 1550 | 110.6 | +2.69 | +0.42 | 0.749 | 44.9% | — | — | — | 0.0% | -3.00 | — | — | — | +0.04 |
| 24 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2022 | 1530 | 118.4 | -4.38 | +0.86 | 0.803 | 45.9% | +20 | — | — | 32.3% | -1.48 | 2–0 | 1–1 | — | -0.54 |
| 25 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2023 | 1458 | 91.9 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 26 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2024 | 1433 | 92.7 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 27 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2025 | 1436 | 101.4 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 28 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2026 | 1418 | 97.5 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 1750 | 128.4 | -1.24 | -1.46 | 0.882 | 48.1% | +25 | -91 | -39 | 40.8% | -0.65 | 7–10 (41%) | 13–14 (48%) | 101.3 | -0.24 | — | 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 |
Each player's five most-played main-draw opponents. The current matchup is highlighted when it appears in a player's top five.
| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Francisco Cerundolo | 2 | 1 | 3 | May 30, 2026 | H2H |
| Daniel Altmaier | 1 | 1 | 2 | Sep 2, 2026 | H2H |
| Flavio Cobolli | 0 | 2 | 2 | Jun 1, 2026 | H2H |
| Alejandro Davidovich Fokina | 0 | 2 | 2 | Mar 6, 2026 | H2H |
| Marin Cilic | 1 | 1 | 2 | Mar 5, 2026 | H2H |
| 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 |