Pieter (" Piet") Aldrich (born 7 September 1965) is a former professional tennis player from South Africa. A doubles specialist, he won two Grand Slam men's doubles titles (Australian Open and US Open) and became the world No. 1 in doubles in 1990.
In 1990, Aldrich won the men's doubles titles at both the Australian Open and the US Open, partnering his fellow South African player Danie Visser. The pair were also doubles runners-up at Wimbledon that year.
1990 also saw Aldrich win his first (and only) top-level singles title at Newport, Rhode Island. His career-high ranking in singles was world No. 64, which he achieved in 1988.
Aldrich won the final doubles title of his career in 1992 in Johannesburg.
| 6–4, 4–6, 6–1, 6–4 |
| 6–7(5–7), 6–7(4–7), 6–7(5–7) |
| 6–2, 7–6(7–3), 6–2 |
| {class=wikitable style=font-size:97% !Legend |
| Grand Slam Tournaments (0–0) |
| ATP World Tour Finals (0–0) |
| ATP Masters 1000 Series (0–0) |
| ATP 500 Series (0–0) |
| ATP 250 Series (1–0) |
| Hard (0–0) |
| Clay (0–0) |
| Grass (1–0) |
| Carpet (0–0) |
| Outdoors (1–0) |
| Indoors (0–0) |
| Win | 1–0 | Newport, United States | World Series | Grass | Darren Cahill | 7–6(12–10), 1–6, 6–1 |
| {class=wikitable style=font-size:97% !Legend |
| Grand Slam Tournaments (2–1) |
| ATP World Tour Finals (0–0) |
| ATP Masters 1000 Series (0–1) |
| ATP 500 Series (1–0) |
| ATP 250 Series (6–8) |
| Hard (5–6) |
| Clay (2–2) |
| Grass (0–2) |
| Carpet (2–0) |
| Outdoors (6–9) |
| Indoors (3–1) |
| Win | 1–0 | Charleston, United States | Grand Prix | Clay | Danie Visser | Jorge Lozano Todd Witsken | 7–6, 6–3 | |
| Loss | 1–1 | Forest Hills, United States | Grand Prix | Clay | Danie Visser | Jorge Lozano Todd Witsken | 3–6, 6–7 | |
| Loss | 1–2 | Queen's, United Kingdom | Grand Prix | Grass | Danie Visser | Ken Flach Robert Seguso | 2–6, 6–7 | |
| Loss | 1–3 | Stratton Mountain, United States | Grand Prix | Hard | Danie Visser | Jorge Lozano Todd Witsken | 3–6, 6–7 | |
| Loss | 1–4 | Sydney, Australia | Grand Prix | Hard | Danie Visser | Darren Cahill Wally Masur | 4–6, 3–6 | |
| Loss | 1–5 | Stratton Mountain, United States | Grand Prix | Hard | Danie Visser | Mark Kratzmann Wally Masur | 3–6, 6–4, 6–7 | |
| Win | 2–5 | Indianapolis, United States | Grand Prix | Hard | Danie Visser | Peter Doohan Laurie Warder | 7–6, 7–6 | |
| Loss | 2–6 | Cincinnati, United States | Grand Prix | Hard | Danie Visser | Ken Flach Robert Seguso | 4–6, 4–6 | |
| Win | 3–6 | San Francisco, United States | Grand Prix | Carpet | Danie Visser | Paul Annacone Christo van Rensburg | 6–4, 6–3 | |
| Win | 4–6 | Frankfurt Cup | Frankfurt Cup, Germany | Grand Prix | Carpet | Danie Visser | Kevin Curren Eric Jelen | 7–6, 6–7, 6–3 |
| Loss | 4–7 | Sydney, Australia | World Series | Hard | Danie Visser | Pat Cash Mark Kratzmann | 4–6, 5–7 | |
| Win | 5–7 | Australian Open, Australia | Grand Slam | Hard | Danie Visser | Grant Connell Glenn Michibata | 6–4, 4–6, 6–1, 6–4 | |
| Loss | 5–8 | Wimbledon, United Kingdom | Grand Slam | Grass | Danie Visser | Rick Leach Jim Pugh | 6–7, 6–7, 6–7 | |
| Win | 6–8 | Stuttgart Open, Germany | Championship Series | Clay | Danie Visser | Per Henricsson Nicklas Utgren | 6–3, 6–4 | |
| Win | 7–8 | Flushing Meadows, United States | Grand Slam | Hard | Danie Visser | Paul Annacone David Wheaton | 6–2, 7–6, 6–2 | |
| Win | 8–8 | Berlin, Germany | World Series | Carpet | Danie Visser | Kevin Curren Patrick Galbraith | 7–6, 7–6 | |
| Loss | 8–9 | San Francisco, United States | World Series | Hard | Danie Visser | Jim Grabb Richey Reneberg | 4–6, 5–7 | |
| Win | 9–9 | Johannesburg, South Africa | World Series | Hard | Danie Visser | Wayne Ferreira Piet Norval | 6–4, 6–4 | |
| Loss | 9–10 | Nice, France | World Series | Clay | Danie Visser | Patrick Galbraith Scott Melville | 1–6, 6–3, 4–6 |
| {class=wikitable style=font-size:97% !Legend |
| ATP Challenger (1–1) |
| ITF Futures (0–0) |
| Hard (0–1) |
| Clay (0–0) |
| Grass (1–0) |
| Carpet (0–0) |
| Loss | 0–1 | Cape Town, South Africa | Challenger | Hard | Christo Van Rensburg | 3–6, 1–6 | |
| Win | 1–1 | Johannesburg, South Africa | Challenger | Grass | Wayne Ferreira | 6–3, 6–3 |
| {class=wikitable style=font-size:97% !Legend |
| ATP Challenger (2–0) |
| ITF Futures (0–0) |
| Hard (1–0) |
| Clay (0–0) |
| Grass (1–0) |
| Carpet (0–0) |
| Win | 1–0 | Johannesburg, South Africa | Challenger | Grass | Danie Visser | David Adams Dean Botha | 7–6, 6–4 | |
| Win | 2–0 | Indian Wells, United States | Challenger | Hard | Danie Visser | Mike Briggs Trevor Kronemann | 7–6, 2–6, 7–5 |
| Grand Slam tournaments | ||||||||||||||||||||||
| Australian Open | A | 1R | 1R | A | Q3 | Q1 !0 / 2 !0–2 ! | ||||||||||||||||
| French Open | A | A | A | A | A | A !0 / 0 !0–0 ! | ||||||||||||||||
| Wimbledon | Q2 | 2R | 2R | Q2 | A | A !0 / 2 !2–2 ! | ||||||||||||||||
| US Open | A | 3R | 3R | A | A | A !0 / 2 !4–2 ! | ||||||||||||||||
| ATP Masters Series | ||||||||||||||||||||||
| Indian Wells | A | 1R | A | A | A | A !0 / 1 !0–1 ! | ||||||||||||||||
| Miami Masters | A | 2R | 2R | 1R | A | A !0 / 3 !2–3 ! | ||||||||||||||||
| Cincinnati | A | 2R | 2R | A | A | A !0 / 2 !2–2 ! | ||||||||||||||||
| Grand Slam tournaments | ||||||||||||||||||||||
| Australian Open | A | A | 3R | W | 1R | 3R | A | A | A !1 / 4 !10–3 ! | |||||||||||||
| French Open | A | 1R | A | QF | A | 2R | A | A | A !0 / 3 !4–3 ! | |||||||||||||
| Wimbledon | 3R | QF | QF | F | A | 1R | A | A | A !0 / 5 !13–5 ! | |||||||||||||
| US Open | 1R | 1R | 2R | W | A | A | A | A | A !1 / 4 !7–3 ! | |||||||||||||
| Year-end Championships | ||||||||||||||||||||||
| ATP Finals | DNQ | RR | Did not qualify !0 / 1 !1–2 ! | |||||||||||||||||||
| ATP Masters Series | ||||||||||||||||||||||
| Indian Wells | A | A | SF | 2R | 1R | 1R | A | A | Q1 !0 / 4 !3–4 ! | |||||||||||||
| Miami Masters | A | 2R | SF | 2R | QF | 2R | A | A | A !0 / 5 !8–5 ! | |||||||||||||
| Monte Carlo | A | A | A | A | 2R | 2R | A | A | A !0 / 2 !1–2 ! | |||||||||||||
| Hamburg | A | A | SF | A | A | 2R | A | A | A !0 / 2 !3–2 ! | |||||||||||||
| Rome | A | A | 1R | A | A | A | A | A | A !0 / 1 !0–1 ! | |||||||||||||
| Cincinnati | A | 1R | F | QF | A | A | A | A | A !0 / 3 !5–3 ! | |||||||||||||
| Paris Masters | A | QF | SF | 2R | A | A | A | A | A !0 / 3 !3–3 ! | |||||||||||||
| Grand Slam tournaments | ||||||||||||||||||||||
| Australian Open | A | A | A | A | 1R !0 / 1 !0–1 ! | |||||||||||||||||
| French Open | A | A | 3R | A | 2R !0 / 2 !3–2 ! | |||||||||||||||||
| Wimbledon | 2R | 1R | QF | A | 1R !0 / 4 !4–4 ! | |||||||||||||||||
| US Open | A | SF | QF | A | A !0 / 2 !5–2 ! | |||||||||||||||||
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