Bill Sidwell
| Full name | Oswald William Thomas Sidwell |
|---|---|
| Country |
 Australia |
| Residence | Sydney, Australia |
| Born |
16 April 1920 Goulburn, NSW |
| Height | 5 ft 9 in (175 cm) |
| Retired | 1951 |
| Plays | Right-handed |
| Singles | |
| Highest ranking | No. 10 (1949, John Olliff)[1] |
| 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) |
| US Open | W (1949) |
| Grand Slam Mixed Doubles results | |
| Australian Open | F (1948) |
| Team competitions | |
| Davis Cup | F (1948Ch, 1949Ch) |
Oswald William Thomas (Bill) Sidwell (born 16 April 1920 in Goulburn, New South Wales) is an Australian former tennis player.
Sidwell reached four Grand Slam doubles finals, winning once, and 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 is currently Treasurer of the Australian Veteran Golfers Association [AVGA] and is playing golf regularly in place of tennis.
He was ranked World No. 10 for 1949 by John Olliff.[1]
Grand Slam finals
Doubles
Titles (1)
| Year | Tournament | Partner | Opponents | Score |
| 1949 | US National Championships | John Bromwich | Frank Sedgman George Worthington | 6–4, 6–0, 6–1 |
Runners-up (4)
| Year | Tournament | Partner | Opponents | Score |
| 1947 | French Championships |  Tom Brown |  Eustace Fannin Eric Sturgess | 4–6, 6–4, 4–6, 3–6 |
| 1947 | Wimbledon |  Tony Mottram |  Bob Falkenburg Jack Kramer | 6–8, 3–6, 3–6 |
| 1949 | Australian Championships | Geoff Brown | John Bromwich Adrian Quist | 6–1, 5–7, 2–6, 3–6 |
| 1950 | Wimbledon | Geoff Brown | John Bromwich Adrian Quist | 5–7, 6–3, 3–6, 6–3, 2–6 |
Mixed doubles
Runners-up (1)
| Year | Tournament | Partner | Opponents | Score |
| 1948 | Australian Championships | Thelma Coyne Long | Nancye Wynne Bolton Colin Long | 5–7, 6–4, 6–8 |