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Bill Sidwell
	Sidwell (1945)
Full name	Oswald William Thomas Sidwell
Country (sports)	Australia
Residence	Sydney, Australia
Born	16 April 1920; Goulburn, New South Wales, Australia
Died	19 August 2021 (aged 101); Caringbah, New South Wales, Australia
Height	1.75 m (5 ft 9 in)
Retired	1951
Plays	Right-handed
Singles
Highest ranking	No. 10 (1949, John Olliff)
Grand Slam singles results
Australian Open	SF (1948, 1949, 1950)
Wimbledon	4R (1950)
US Open	3R (1947, 1948)
Doubles
Grand Slam doubles results
Australian Open	F (1949)
French Open	F (1947)
Wimbledon	F (1947, 1950)
US Open	W (1949)
Grand Slam mixed doubles results
Australian Open	F (1948)
Team competitions
Davis Cup	F (1948Ch, 1949Ch)

Oswald William Thomas Sidwell (16 April 1920 – 19 August 2021) was an Australian tennis player.

Sidwell reached five Grand Slam doubles finals, winning once, at the 1949 U.S. National Championships with compatriot John Bromwich. He also played in the Davis Cup in 1948 and 1949 where Australia lost to the United States both years in the Challenge Round. As a junior, he won the Australian Open boys' singles event in 1939. Sidwell played golf regularly in place of tennis.

He was ranked world No. 10 for 1949 by John Olliff.^[1] As of December 2008, Sidwell was still organising golf events at the age of 88.^[2] He turned 100 in April 2020^[3] and died in Caringbah in August 2021, at the age of 101.^[4]

Grand Slam finals

Doubles (1 title, 4 runners-up)

Result	Year	Championship	Surface	Partner	Opponents	Score
Loss	1947	French Championships	Clay	Tom Brown	Eustace Fannin Eric Sturgess	4–6, 6–4, 4–6, 3–6
Loss	1947	Wimbledon	Grass	Tony Mottram	Bob Falkenburg Jack Kramer	6–8, 3–6, 3–6
Loss	1949	Australian Championships	Grass	Geoff Brown	John Bromwich Adrian Quist	6–1, 5–7, 2–6, 3–6
Win	1949	US National Championships	Grass	John Bromwich	Frank Sedgman George Worthington	6–4, 6–0, 6–1
Loss	1950	Wimbledon	Grass	Geoff Brown	John Bromwich Adrian Quist	5–7, 6–3, 3–6, 6–3, 2–6