Owen Keir Davidson (4 October 1943 – 12 May 2023) was an Australian professional tennis player of the 1960s and 1970s.

Alongside Billie Jean King, Davidson won eight grand slam mixed doubles titles. In 1967 he won a calendar year slam for mixed doubles, when he won the Australian Championships (with Lesley Turner Bowrey), and the French Championships, Wimbledon and the US Championships (with King).

Davidson became the first player to win a match in the open era of tennis when he defeated John Clifton in the first round of the British Hard Court Championships in Bournemouth played in April 1968.

His best grand slam singles result was at Wimbledon in 1966, when he reached the semifinals (beating top seed Roy Emerson before losing to Manuel Santana). He was also the 1972 Australian Open and the 1973 US Open men's doubles champion, partnering John Newcombe and Ken Rosewall respectively. He was inducted into the International Tennis Hall of Fame in Newport, Rhode Island in 2010. He was inducted into the Australian Tennis Hall of Fame at the Rod Laver Arena in Melbourne on 26 January 2011 (Australia Day).

Davidson died in Conroe, Texas, on 12 May 2023, at the age of 79.

Grand Slam finals

Doubles: 6 (2–4) ResultYearChampionshipSurfacePartnerOpponentsScoreLoss 1966 Wimbledon Grass Bill Bowrey Ken Fletcher John Newcombe 3–6, 4–6, 6–3, 3–6Loss 1967 Australian Championships Grass Bill Bowrey John Newcombe Tony Roche 6–3, 3–6, 5–7, 8–6, 6–8Loss 1967 US Championships Grass Bill Bowrey John Newcombe Tony Roche 8–6, 7–9, 3–6, 3–6Win 1972 Australian Open Grass Ken Rosewall Ross Case Geoff Masters 3–6, 7–6, 6–3Loss 1972 US Open Grass John Newcombe Cliff Drysdale Roger Taylor 4–6, 6–7, 3–6Win 1973 US Open Grass John Newcombe Rod Laver Ken Rosewall 7–5, 2–6, 7–5, 7–5

Mixed doubles: 12 (11–1) ResultYearChampionshipSurfacePartnerOpponentsScoreWin 1965 Australian Championships Grass Robyn Ebbern Margaret Smith John Newcombe shared, final not playedWin 1966 US Championships Grass Donna Floyd Fales Carol Hanks Aucamp Ed Rubinoff 6–1, 6–3Win 1967 Australian Championships (2) Grass Lesley Turner Bowrey Judy Tegart-Dalton Tony Roche 9–7, 6–4Win 1967 French Championships Clay Billie Jean King Ann Haydon-Jones Ion Țiriac 6–3, 6–1Win 1967 Wimbledon Grass Billie Jean King Maria Bueno Ken Fletcher 7–5, 6–2Win 1967 US Championships (2) Grass Billie Jean King Rosemary Casals Stan Smith 6–3, 6–2Loss 1968 French Open Clay Billie Jean King Françoise Dürr Jean-Claude Barclay 1–6, 4–6Win 1971 Wimbledon (2) Grass Billie Jean King Margaret Court Marty Riessen 3–6, 6–2, 15–13Win 1971 US Open (3) Grass Billie Jean King Bob Maud Betty Stöve 6–3, 7–5Win 1973 Wimbledon (3) Grass Billie Jean King Janet Newberry Raúl Ramírez 6–3, 6–2Win 1973 US Open (4) Grass Billie Jean King Margaret Court Marty Riessen 6–3, 3–6, 7–6Win 1974 Wimbledon (4) Grass Billie Jean King Lesley Charles Mark Farrell 6–3, 9–7

Career finals Open-era doubles: 20 (10 wins / 10 losses) ResultW/L DateTournamentSurfacePartnerOpponentsScoreWin 1. 1969 Monte-Carlo, Monaco Clay John Newcombe Pancho Gonzales Dennis Ralston 7–5, 11–13, 6–2, 6–1Win 2. 1969 London/Queen's Club, England Grass Dennis Ralston Thomaz Koch Ove Nils Bengtson 8–6, 6–3Loss 1. 1970 Rome, Italy Clay Bill Bowrey Ilie Năstase Ion Țiriac 6–0, 8–10, 3–6, 8–6, 1–6Win 3. 1970 Hilversum, Netherlands Hard Bill Bowrey John Alexander Phil Dent 6–3, 6–4, 6–2Loss 2. 1970 Stockholm, Sweden Hard (i) Bob Carmichael Arthur Ashe Stan Smith 0–6, 7–5, 5–7Win 4. 1971 Bournemouth, England Clay Bill Bowrey Patricio Cornejo Jaime Fillol 8–6, 6–2, 3–6, 4–6, 6–3Win 5. 1972Australian Open, Melbourne Grass Ken Rosewall Ross Case Geoff Masters 3–6, 7–6, 6–3Loss 3. 1972US Open, New York Grass John Newcombe Cliff Drysdale Roger Taylor 4–6, 6–7, 4–6Loss 4. 1973 Montreal, Canada Hard John Newcombe Rod Laver Ken Rosewall 5–7, 6–7Win 6. 1973US Open, New York Grass John Newcombe Roy Emerson Rod Laver 7–5, 2–6, 7–5, 7–5Win 7. 1973 Chicago, US Carpet John Newcombe Gerald Battrick Graham Stilwell 6–7, 7–6, 7–6Loss 5. 1973 Fort Worth, US Hard John Newcombe Brian Gottfried Dick Stockton 6–7, 4–6Win 8. 1973 London Carpet Mark Cox Gerald Battrick Graham Stilwell 6–4, 8–6Loss 6. 1974 Baltimore, US Carpet Clark Graebner Jürgen Fassbender Karl Meiler 6–7, 5–7Win 9. 1974 St. Petersburg WCT, US Hard John Newcombe Clark Graebner Charlie Pasarell 4–6, 6–3, 6–4Loss 7. 1974 New Orleans WCT, US John Newcombe Robert Lutz Stan Smith 6–4, 4–6, 6–7Win 10. 1974 Orlando WCT, US Clay John Newcombe Brian Gottfried Dick Stockton 7–6, 6–3Loss 8. 1974 Charlotte, US Clay John Newcombe Buster Mottram Raúl Ramírez 3–6, 6–1, 3–6Loss 9. 1974World Doubles WCT, Montreal Carpet John Newcombe Bob Hewitt Frew McMillan 2–6, 7–6, 1–6, 2–6Loss 10. 1974 Maui, US Hard John Newcombe Dick Stockton Roscoe Tanner 3–6, 6–7

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