H2H data updated: 2026-10-20 00:00 UTC

Ken Flach vs Pieter Aldrich H2H: 0-1

Pieter Aldrich holds a 1–0 lead over Ken Flach in their ATP head-to-head. Across 1 main-draw meeting, Pieter Aldrich leads 1–0 on hard courts. Most recently, Pieter Aldrich won the 1988 Cincinnati Open round of 64 6-1 2-6 6-3.

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Ken Flach
USA Right-Handed 185 cm / 6'1"
H2H
0 – 1
1 main-draw meetings
Pieter Aldrich
RSA Age 61 Right-Handed 180 cm / 5'11"

H2H Match Log

PlayerScorePlayerMatch DataDateRoundTournamentCategorySurface
Pieter Aldrich #115 6-1 2-6 6-3 Ken Flach #93 Match data Aug 17, 1988* R64 Cincinnati Open ATP 500 Hard

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
Ken Flach #815 #56 130 1,715 52 80 39.4% 0 0 0 0 0 0
Pieter Aldrich #1,122 #64 256 1,675 36 40 47.4% 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 Ken Flach Pieter Aldrich
YrW-LWin %RankEloGSTitles YrW-LWin %RankEloGSTitles
19 1982 0–1 0.0% — 1,498 0 0 — — — — — — —
20 1983 2–3 40.0% #314 1,521 0 0 1986 1–1 50.0% #275 1,512 0 0
21 1984 7–6 53.8% #155 1,599 0 0 1987 1–1 50.0% #134 1,535 0 0
22 1985 12–12 50.0% #60 1,676 0 0 1988 15–15 50.0% #68 1,662 0 0
23 1986 4–15 21.1% #223 1,557 0 0 1989 13–19 40.6% #125 1,619 0 0
24 1987 10–13 43.5% #100 1,621 0 0 1990 6–4 60.0% #192 1,663 0 1
25 1988 7–12 36.8% #203 1,618 0 0 — — — — — — —
26 1989 6–7 46.2% #194 1,651 0 0 — — — — — — —
27 1990 3–6 33.3% #222 1,611 0 0 — — — — — — —
28 1991 0–2 0.0% #572 1,575 0 0 — — — — — — —
29 1992 0–1 0.0% #742 1,559 0 0 — — — — — — —
31 1994 1–1 50.0% #514 1,575 0 0 — — — — — — —
32 1995 0–1 0.0% #835 1,570 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 Ken Flach Pieter Aldrich
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 %
19 1982 — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — — — — — —
20 1983 1 1 2 50.0% 0 1 1 0.0% 1 1 2 50.0% — — — — 1986 1 1 2 50.0% — — — — — — — — — — — —
21 1984 3 2 5 60.0% — — — — 3 3 6 50.0% 1 1 2 50.0% 1987 1 1 2 50.0% — — — — — — — — — — — —
22 1985 10 8 18 55.6% — — — — 1 2 3 33.3% 1 2 3 33.3% 1988 11 10 21 52.4% 0 1 1 0.0% 4 4 8 50.0% — — — —
23 1986 2 6 8 25.0% 0 3 3 0.0% 2 2 4 50.0% 0 4 4 0.0% 1989 8 11 19 42.1% — — — — 3 4 7 42.9% 2 4 6 33.3%
24 1987 6 8 14 42.9% — — — — 4 4 8 50.0% 0 1 1 0.0% 1990 0 3 3 0.0% — — — — 5 0 5 100.0% 1 1 2 50.0%
25 1988 2 6 8 25.0% 0 1 1 0.0% 3 2 5 60.0% 2 3 5 40.0% — — — — — — — — — — — — — — — — —
26 1989 3 4 7 42.9% — — — — 2 1 3 66.7% 1 2 3 33.3% — — — — — — — — — — — — — — — — —
27 1990 2 4 6 33.3% — — — — 1 1 2 50.0% 0 1 1 0.0% — — — — — — — — — — — — — — — — —
28 1991 0 1 1 0.0% — — — — — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — —
29 1992 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
31 1994 1 1 2 50.0% — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
32 1995 — — — — — — — — 0 1 1 0.0% — — — — — — — — — — — — — — — — — — — — —
Career — 30 42 72 41.7% 0 6 6 0.0% 17 17 34 50.0% 5 15 20 25.0% — 21 26 47 44.7% 0 1 1 0.0% 12 8 20 60.0% 3 5 8 37.5%

Advanced Statistics Comparison by Age

Seasons are aligned by the age each player spent most of that calendar year. Metrics use eligible main-draw results; point statistics use matches with detailed data. 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 Ken Flach Pieter Aldrich
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
19 1982 1499 112.4 — — — — — — — 0.0% -4.00 — — — -0.28 — — — — — — — — — — — — — — — —
20 1983 1522 107.7 — — — — — — — 41.7% -0.75 — 0–2 — +0.25 1986 1513 110.1 — — — — — — — 50.0% +0.17 1–1 — — +0.09
21 1984 1599 117.5 — — — — +21 — -15 51.2% -0.05 4–3 (57%) 2–4 (33%) 101.1 +0.63 1987 1536 112.9 — — — — — — — 50.0% -1.00 — — — -0.32
22 1985 1676 134.2 — — — — +19 — -94 44.8% -0.26 4–0 (100%) 4–2 (67%) 107.4 -0.49 1988 1662 129.6 — — — — +17 — -56 51.3% -0.08 5–6 (45%) 7–7 (50%) 99.5 +0.62
23 1986 1557 111.4 — — — — +7 -76 +56 29.4% -1.16 2–4 (33%) 2–4 (33%) 97.2 -0.12 1989 1620 119.5 — — — — +5 — -29 43.3% -0.48 7–7 (50%) 4–4 (50%) 97.9 +0.20
24 1987 1622 115.8 — — — — -40 — +10 48.6% -0.39 2–5 (29%) 9–4 (69%) 99.8 +1.50 1990 1664 118.5 — — — — -66 — +47 52.2% +0.04 2–0 2–1 (67%) — +0.37
25 1988 1618 116.8 — — — — -94 — +56 42.1% -0.67 4–5 (44%) 4–5 (44%) 98.2 -1.49 — — — — — — — — — — — — — — — —
26 1989 1652 118.7 — — — — -87 — +41 48.9% -0.31 3–4 (43%) 7–5 (58%) 102.6 -0.04 — — — — — — — — — — — — — — — —
27 1990 1612 118.0 — — — — -53 — — 44.0% -0.40 1–4 (20%) 2–1 (67%) — -0.05 — — — — — — — — — — — — — — — —
28 1991 1576 100.1 -1.14 -2.20 0.974 48.8% — — — 20.0% -1.20 0–1 1–1 — +0.27 — — — — — — — — — — — — — — — —
29 1992 1559 98.8 -2.84 -0.85 0.759 44.2% — — — 0.0% -3.00 — — — +0.08 — — — — — — — — — — — — — — — —
31 1994 1576 112.6 -0.30 +1.03 0.724 46.6% — — — 40.0% -1.00 1–0 1–0 — -0.06 — — — — — — — — — — — — — — — —
32 1995 1571 105.1 +1.22 +5.29 0.983 49.9% — — — 40.0% 0.00 0–1 0–1 — -0.28 — — — — — — — — — — — — — — — —
Career — 1715 126.9 -0.75 +0.35 0.851 47.5% -29 -76 +12 43.2% -0.53 21–27 (44%) 32–29 (52%) 100.9 -0.06 — 1676 127.4 — — — — +3 — -21 47.8% -0.25 15–14 (52%) 13–12 (52%) 101.1 +1.26

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.