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

Jeff Borowiak vs Zan Guerry H2H: 2-0

Jeff Borowiak holds a 2–0 lead over Zan Guerry in their ATP head-to-head. Across 2 main-draw meetings, Jeff Borowiak leads 1–0 on clay and 1–0 on grass. Most recently, Jeff Borowiak won the 1978 Indianapolis round of 16 5-7 6-3 6-4.

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Jeff Borowiak
USA Age 76 Right-Handed 193 cm / 6'4"
H2H
2 – 0
2 main draw meetings
Zan Guerry
USA Age 77 Right-Handed

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Jeff Borowiak #52 5-7 6-3 6-4 Zan Guerry Match data Aug 11, 1978* R16 Indianapolis ATP 250 Clay
Jeff Borowiak 6-3 3-6 6-1 7-5 Zan Guerry Match data Sep 3, 1971* R128 US Open Grand Slam Grass

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
Jeff Borowiak #920 #20 0 1,958 290 304 48.8% 0 0 0 0 5 5
Zan Guerry #490 #98 0 1,596 41 77 34.7% 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 Jeff Borowiak Zan Guerry
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
18 1968 6–10 37.5% — 1,470 0 0 — — — — — — —
19 1969 3–2 60.0% — 1,511 0 0 1968 4–6 40.0% — 1,476 0 0
20 1970 6–7 46.2% — 1,564 0 0 1969 8–10 44.4% — 1,526 0 0
21 1971 26–20 56.5% — 1,759 0 0 1970 1–4 20.0% — 1,493 0 0
22 1972 20–28 41.7% — 1,825 0 0 1971 4–6 40.0% — 1,500 0 0
23 1973 21–33 38.9% #82 1,732 0 0 1972 5–7 41.7% — 1,507 0 0
24 1974 34–26 56.7% #40 1,858 0 2 1973 3–5 37.5% #203 1,511 0 0
25 1975 31–26 54.4% #48 1,807 0 2 1974 1–1 50.0% #228 1,532 0 0
26 1976 18–23 43.9% #60 1,724 0 2 1975 2–2 50.0% #205 1,561 0 0
27 1977 47–24 66.2% #25 1,825 0 5 1976 0–6 0.0% #176 1,497 0 0
28 1978 16–25 39.0% #98 1,671 0 5 1977 8–16 33.3% #98 1,561 0 0
29 1979 5–13 27.8% #125 1,617 0 5 1978 2–7 22.2% #279 1,521 0 0
30 1980 5–5 50.0% #189 1,670 0 5 1979 1–3 25.0% #326 1,517 0 0
31 1981 18–19 48.6% #52 1,763 0 5 1980 1–2 33.3% — 1,482 0 0
32 1982 21–20 51.2% #94 1,742 0 5 1981 0–1 0.0% — 1,476 0 0
33 1983 13–19 40.6% #98 1,652 0 5 1982 1–1 50.0% — 1,497 0 0
34 1984 0–4 0.0% #520 1,599 0 5 — — — — — — —

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 Jeff Borowiak Zan Guerry
Yr HardClayGrassCarpet Yr HardClayGrassCarpet
W L M Win % W L M Win % W L M Win % W L M Win % W L M Win % W L M Win % W L M Win % W L M Win %
18 1968 4 2 6 66.7% 1 2 3 33.3% 1 5 6 16.7% 0 1 1 0.0% — — — — — — — — — — — — — — — — —
19 1969 3 1 4 75.0% 0 1 1 0.0% — — — — — — — — 1968 — — — — 3 3 6 50.0% 1 3 4 25.0% — — — —
20 1970 1 1 2 50.0% 2 3 5 40.0% 3 2 5 60.0% 0 1 1 0.0% 1969 0 1 1 0.0% 6 5 11 54.5% 2 4 6 33.3% — — — —
21 1971 11 10 21 52.4% 6 5 11 54.5% 4 3 7 57.1% 5 2 7 71.4% 1970 0 1 1 0.0% 1 3 4 25.0% — — — — — — — —
22 1972 9 9 18 50.0% 1 5 6 16.7% 0 1 1 0.0% 10 13 23 43.5% 1971 2 2 4 50.0% 2 3 5 40.0% 0 1 1 0.0% — — — —
23 1973 8 8 16 50.0% 9 12 21 42.9% 1 3 4 25.0% 3 10 13 23.1% 1972 1 2 3 33.3% 4 4 8 50.0% 0 1 1 0.0% — — — —
24 1974 9 9 18 50.0% 13 11 24 54.2% 2 3 5 40.0% 10 3 13 76.9% 1973 2 4 6 33.3% — — — — 1 1 2 50.0% — — — —
25 1975 11 9 20 55.0% 8 10 18 44.4% 3 2 5 60.0% 9 5 14 64.3% 1974 — — — — 1 1 2 50.0% — — — — — — — —
26 1976 3 3 6 50.0% 12 10 22 54.5% 0 2 2 0.0% 3 8 11 27.3% 1975 1 1 2 50.0% 1 1 2 50.0% — — — — — — — —
27 1977 7 8 15 46.7% 19 5 24 79.2% 0 2 2 0.0% 21 9 30 70.0% 1976 0 2 2 0.0% 0 3 3 0.0% — — — — 0 1 1 0.0%
28 1978 1 5 6 16.7% 13 9 22 59.1% 0 3 3 0.0% 2 8 10 20.0% 1977 0 3 3 0.0% 8 11 19 42.1% — — — — 0 2 2 0.0%
29 1979 0 3 3 0.0% 2 5 7 28.6% 1 1 2 50.0% 2 4 6 33.3% 1978 — — — — 2 3 5 40.0% — — — — 0 4 4 0.0%
30 1980 3 3 6 50.0% — — — — — — — — 2 2 4 50.0% 1979 0 1 1 0.0% 1 2 3 33.3% — — — — — — — —
31 1981 11 9 20 55.0% 2 3 5 40.0% 3 2 5 60.0% 2 5 7 28.6% 1980 — — — — 0 1 1 0.0% 1 1 2 50.0% — — — —
32 1982 4 7 11 36.4% 4 3 7 57.1% 10 6 16 62.5% 3 4 7 42.9% 1981 — — — — 0 1 1 0.0% — — — — — — — —
33 1983 1 6 7 14.3% 7 5 12 58.3% 2 4 6 33.3% 3 4 7 42.9% 1982 — — — — 1 1 2 50.0% — — — — — — — —
34 1984 0 1 1 0.0% 0 2 2 0.0% 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — —
Career — 86 94 180 47.8% 99 91 190 52.1% 30 40 70 42.9% 75 79 154 48.7% — 6 17 23 26.1% 30 42 72 41.7% 5 11 16 31.2% 0 7 7 0.0%

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 Jeff Borowiak Zan Guerry
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
18 1968 1471 97.5 — — — — +106 +20 -42 37.8% -0.84 0–2 — — +0.39 — — — — — — — — — — — — — — — —
19 1969 1512 107.1 — — — — +167 — — 50.0% +0.43 3–1 (75%) — — +0.31 1968 1477 99.0 — — — — — +41 -13 41.7% -0.50 1–1 — — -0.13
20 1970 1565 109.0 — — — — +89 -54 -66 46.7% -0.47 1–0 0–2 — -0.25 1969 1527 112.6 — — — — — +58 -60 47.9% -0.10 3–3 (50%) — — -0.60
21 1971 1759 131.8 — — — — +6 -154 -148 53.0% +0.15 10–5 (67%) 9–6 (60%) — -1.12 1970 1493 96.6 — — — — — +59 — 30.8% -1.92 1–2 (33%) — — +0.15
22 1972 1826 149.5 — — — — +40 -240 — 43.2% -0.46 10–10 (50%) 9–10 (47%) — -7.30 1971 1500 108.9 — — — — +4 +68 — 34.8% -0.43 2–1 (67%) 0–3 (0%) — +0.04
23 1973 1733 135.6 — — — — +29 -103 -173 43.0% -0.37 9–15 (38%) 7–10 (41%) — -4.54 1972 1507 102.0 — — — — -12 +64 — 45.5% -0.03 3–4 (43%) 3–6 (33%) — +0.98
24 1974 1859 146.3 — — — — +25 -114 -273 56.0% +0.23 8–10 (44%) 12–6 (67%) — -4.92 1973 1511 109.4 — — — — -1 — — 45.8% -0.17 2–3 (40%) 2–2 (50%) — +0.71
25 1975 1808 148.3 — — — — +64 -110 -178 53.6% +0.42 11–12 (48%) 5–9 (36%) — -5.88 1974 1533 109.0 — — — — — — — 50.0% -0.50 — 1–0 — -0.19
26 1976 1725 143.4 — — — — +66 -6 — 47.9% -0.08 9–9 (50%) 6–8 (43%) — -2.54 1975 1562 108.4 — — — — — — — 44.4% -0.22 1–0 0–1 — +0.08
27 1977 1825 151.8 — — — — -12 +75 — 61.0% +0.81 14–7 (67%) 9–9 (50%) — +0.48 1976 1497 112.0 — — — — -18 +37 — 14.3% -1.71 0–1 0–1 — +0.12
28 1978 1672 145.7 — — — — -11 +208 -147 43.0% -0.37 3–6 (33%) 4–4 (50%) — -3.12 1977 1561 136.0 — — — — -118 +40 — 39.3% -0.73 2–6 (25%) 1–2 (33%) — -0.81
29 1979 1618 131.4 — — — — -19 +166 — 38.3% -0.58 2–5 (29%) 3–6 (33%) — -1.00 1978 1522 109.4 — — — — -106 +76 — 37.5% -1.04 1–5 (17%) 2–0 — +0.86
30 1980 1671 131.2 — — — — -19 — — 59.1% +0.91 1–3 (25%) 1–1 — -0.33 1979 1517 104.3 — — — — — +60 — 40.0% -0.70 0–2 — — -0.17
31 1981 1764 143.3 — — — — -10 -18 -91 48.9% -0.23 4–5 (44%) 10–10 (50%) — -1.40 1980 1483 91.9 — — — — — — — 0.0% -3.75 — — — +0.48
32 1982 1742 140.8 — — — — -6 -6 -10 53.5% +0.11 4–8 (33%) 9–8 (53%) — -2.10 1981 1477 100.2 — — — — — — — 0.0% -3.50 — — — -0.08
33 1983 1652 129.5 — — — — -39 +97 +56 43.8% -0.57 5–5 (50%) 9–4 (69%) — -1.80 1982 1498 109.7 — — — — — — — 40.0% -0.80 1–0 — — -0.23
34 1984 1599 108.8 — — — — — — — 20.0% -1.60 0–2 0–1 — -0.33 — — — — — — — — — — — — — — — —
Career — 1959 147.5 — — — — +19 -10 -85 49.6% -0.02 94–105 (47%) 93–94 (50%) 100.6 -6.02 — 1596 119.1 — — — — -44 +53 -41 39.6% -0.63 17–28 (38%) 9–15 (38%) 94.9 +1.04

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.