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 Jared Donaldson H2H: 0-1
Jared Donaldson holds a 1–0 lead over Stefan Kozlov in their ATP head-to-head. Across 1 main-draw meeting, Jared Donaldson leads 1–0 on hard courts. Most recently, Jared Donaldson won the 2015 Memphis round of 32 7-5 6-0.
Want to explore more matchups? Advanced rivalry search lets you browse current and historical rivalries, unbeaten records, or every matchup for a player.
H2H
0
–
1
1 main draw meetings
H2H Match Log
| Player | Score | Player | Match Data | Date | Round | Tournament | Category | Surface |
|---|---|---|---|---|---|---|---|---|
| Jared Donaldson | 7-5 6-3 | Stefan Kozlov | Match data | Mar 23, 2017* | Q2 | Miami Open | Masters 1000 | Hard |
| Stefan Kozlov | 7-5 6-3 | Jared Donaldson | Match data | Feb 27, 2017 | Q2 | Mexican Open | ATP 500 | Hard |
| Jared Donaldson | 7-5 6-0 | Stefan Kozlov | Match data | Feb 12, 2015* | R32 | Memphis | ATP 250 | Hard |
2 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.
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 |
| Jared Donaldson | #966 | #48 | 1,038 | 1,841 | 48 | 62 | 43.6% | 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 | Jared Donaldson | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 2014 | 0–2 | 0.0% | #261 | 1,539 | 0 | 0 |
| 18 | 2016 | 3–2 | 60.0% | #116 | 1,481 | 0 | 0 | 2015 | 4–7 | 36.4% | #134 | 1,621 | 0 | 0 |
| 19 | 2017 | 2–9 | 18.2% | #167 | 1,549 | 0 | 0 | 2016 | 7–10 | 41.2% | #105 | 1,729 | 0 | 0 |
| 20 | 2018 | 0–1 | 0.0% | #316 | 1,528 | 0 | 0 | 2017 | 22–22 | 50.0% | #54 | 1,767 | 0 | 0 |
| 21 | — | — | — | — | — | — | — | 2018 | 14–19 | 42.4% | #111 | 1,746 | 0 | 0 |
| 22 | 2020 | 0–1 | 0.0% | #371 | 1,514 | 0 | 0 | 2019 | 1–2 | 33.3% | #720 | 1,727 | 0 | 0 |
| 23 | 2021 | 0–1 | 0.0% | #159 | 1,550 | 0 | 0 | — | — | — | — | — | — | — |
| 24 | 2022 | 4–8 | 33.3% | #198 | 1,529 | 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 | Jared Donaldson | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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% | — | — | — | — | — | — | — | — | 2014 | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — |
| 18 | 2016 | — | — | — | — | — | — | — | — | 3 | 2 | 5 | 60.0% | 2015 | 3 | 5 | 8 | 37.5% | — | — | — | — | 1 | 2 | 3 | 33.3% |
| 19 | 2017 | 0 | 6 | 6 | 0.0% | — | — | — | — | 2 | 3 | 5 | 40.0% | 2016 | 7 | 9 | 16 | 43.8% | — | — | — | — | 0 | 1 | 1 | 0.0% |
| 20 | 2018 | — | — | — | — | 0 | 1 | 1 | 0.0% | — | — | — | — | 2017 | 17 | 15 | 32 | 53.1% | 2 | 5 | 7 | 28.6% | 3 | 2 | 5 | 60.0% |
| 21 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2018 | 10 | 10 | 20 | 50.0% | 2 | 6 | 8 | 25.0% | 2 | 3 | 5 | 40.0% |
| 22 | 2020 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | 2019 | 1 | 2 | 3 | 33.3% | — | — | — | — | — | — | — | — |
| 23 | 2021 | 0 | 1 | 1 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 24 | 2022 | 4 | 6 | 10 | 40.0% | — | — | — | — | 0 | 2 | 2 | 0.0% | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Career | — | 4 | 17 | 21 | 19.0% | 0 | 1 | 1 | 0.0% | 5 | 8 | 13 | 38.5% | — | 38 | 43 | 81 | 46.9% | 4 | 11 | 15 | 26.7% | 6 | 8 | 14 | 42.9% |
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 109/110 of Jared Donaldson'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 | Jared Donaldson | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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% | 2014 | 2/2 | 8.0 | 2.5 | 54.9% | 67.7% | 58.8% | 29.2% | 8.3% | 63.8% | 27.0% |
| 18 | 2016 | 5/5 | 4.2 | 4.8 | 55.8% | 67.8% | 41.9% | 67.2% | 40.4% | 56.9% | 38.4% | 2015 | 11/11 | 6.5 | 4.0 | 50.3% | 76.1% | 50.3% | 41.6% | 46.5% | 63.5% | 32.1% |
| 19 | 2017 | 11/11 | 3.6 | 4.1 | 58.0% | 65.2% | 44.1% | 53.2% | 35.0% | 56.5% | 32.9% | 2016 | 17/17 | 5.2 | 3.5 | 51.3% | 72.4% | 51.9% | 52.3% | 47.6% | 62.3% | 35.0% |
| 20 | 2018 | 1/1 | 2.0 | 5.0 | 50.9% | 65.5% | 35.7% | 20.0% | 50.0% | 50.9% | 28.0% | 2017 | 43/44 | 7.0 | 3.6 | 52.5% | 75.3% | 50.8% | 55.5% | 35.9% | 63.9% | 36.8% |
| 21 | — | —/— | — | — | — | — | — | — | — | — | — | 2018 | 33/33 | 5.3 | 4.5 | 52.6% | 73.9% | 53.6% | 51.6% | 41.9% | 64.1% | 36.3% |
| 22 | 2020 | 1/1 | 1.0 | 5.0 | 68.5% | 54.1% | 57.1% | 36.4% | 50.0% | 55.1% | 31.7% | 2019 | 3/3 | 6.0 | 6.3 | 47.1% | 66.6% | 43.1% | 50.6% | 56.7% | 53.7% | 35.8% |
| 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% | — | —/— | — | — | — | — | — | — | — | — | — |
| Career | — | 35/35 | 2.6 | 4.3 | 62.0% | 62.4% | 43.9% | 54.8% | 38.2% | 55.1% | 35.3% | — | 109/110 | 6.2 | 4.0 | 52.0% | 74.1% | 51.7% | 51.8% | 40.7% | 63.4% | 35.7% |
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 | Jared Donaldson | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 2013 | 1529 | 99.4 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 17 | 2015 | 1420 | 101.3 | -5.76 | -0.97 | 0.718 | 41.8% | — | — | — | 0.0% | -3.50 | — | — | — | +0.21 | 2014 | 1540 | 116.0 | +0.55 | -0.97 | 0.747 | 46.0% | — | — | — | 16.7% | -1.84 | 0–1 | 1–0 | — | -0.10 |
| 18 | 2016 | 1481 | 107.5 | -3.43 | +1.33 | 0.891 | 48.1% | — | — | +119 | 54.5% | +0.09 | 1–0 | — | — | -0.03 | 2015 | 1622 | 119.6 | -2.51 | -0.92 | 0.881 | 48.1% | -42 | — | +35 | 33.3% | -0.52 | 3–1 (75%) | 1–8 (11%) | — | +0.98 |
| 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 | 2016 | 1729 | 133.9 | -1.15 | +0.03 | 0.928 | 48.6% | +2 | — | — | 41.5% | -0.41 | 2–3 (40%) | 2–4 (33%) | — | -0.28 |
| 20 | 2018 | 1528 | 106.2 | +0.19 | -0.20 | 0.570 | 40.2% | — | — | — | 0.0% | -3.50 | — | — | — | -0.08 | 2017 | 1767 | 139.6 | +0.27 | +1.02 | 1.019 | 50.0% | -15 | -181 | -135 | 48.2% | -0.12 | 8–10 (44%) | 10–10 (50%) | — | +1.11 |
| 21 | 2019 | 1514 | 100.9 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2018 | 1746 | 140.4 | -0.43 | +0.30 | 1.012 | 50.3% | +5 | -138 | -125 | 46.5% | -0.08 | 4–10 (29%) | 7–4 (64%) | — | -0.10 |
| 22 | 2020 | 1514 | 104.1 | -1.24 | +2.90 | 0.705 | 43.9% | — | — | — | 33.3% | -2.33 | 0–1 | 1–0 | — | -0.06 | 2019 | 1727 | 116.8 | -1.27 | +1.03 | 0.773 | 46.1% | +1 | — | — | 42.9% | -1.00 | 0–1 | — | — | -0.22 |
| 23 | 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 | — | 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 | — | 1842 | 138.3 | -0.48 | +0.42 | 0.975 | 49.5% | -9 | -158 | -92 | 44.4% | -0.25 | 17–26 (40%) | 21–26 (45%) | 94.8 | +1.28 |
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.
Jared Donaldson
all rivalries →| Opponent | W | L | M | Last Played | H2H |
|---|---|---|---|---|---|
| Benoit Paire | 1 | 2 | 3 | Aug 8, 2018 | H2H |
| Stefanos Tsitsipas | 1 | 2 | 3 | Aug 2, 2018 | H2H |
| Denis Istomin | 1 | 2 | 3 | May 23, 2018 | H2H |
| Roberto Bautista Agut | 1 | 2 | 3 | May 8, 2018 | H2H |
| Nikoloz Basilashvili | 3 | 0 | 3 | Feb 28, 2018 | H2H |