|Country (sports)||United States|
|Residence||New York City|
|Born||November 4, 1943|
Cleveland, Ohio, USA
|Height||6 ft 2 in (1.88 m)|
|Turned pro||1968 (amateur tour from 1960)|
|Plays||Right-handed (one-handed backhand)|
|Career record||181-104 (Open era)|
|Highest ranking||No. 7 (1968, Lance Tingay)|
|Grand Slam Singles results|
|Australian Open||QF (1966)|
|French Open||4R (1966, 1972)|
|US Open||F (1967)|
|Tour Finals||RR (1971)|
|Career record||141-68 (Open era)|
|Career titles||10 (Open era)|
Clark Graebner (born November 4, 1943), is a retired American professional tennis player.
In 1964 he married rising American tennis player Carole Caldwell. They had two children, a daughter, Cameron, and a son, Clark. The couple separated in 1974 and eventually divorced. In 1975 Graebner married Patti Morgan. Caldwell died in New York City following a brief battle with cancer on November 19, 2008.
He graduated from Northwestern University, where he joined the Delta Upsilon fraternity. Graebner's deceased wife, Carole, was also a successful touring tennis professional. Graebner was considered to be one of the fastest servers in his time.
In the 1967 United States Championship, the last time the event, today's U.S. Open, was open only to amateur players, Graebner beat Roy Emerson before losing in the final to John Newcombe. The following year he reached the semi-finals in singles at both Wimbledon and the inaugural U.S. Open.
Graebner was one of the protagonists of John McPhee's book, Levels of the Game, which is about a semifinal match played between himself and Ashe at the 1968 U.S. Open at Forest Hills. Ashe won the match.
Graebner's most significant title was probably the men's doubles title at the 1966 French Championships, where he and Dennis Ralston beat Ion Ţiriac and Ilie Năstase in the final. He also won the 1968 U.S. Men's Clay Court singles Championship in Milwaukee, the 1969 and 1970 U.S. Men's Clay Court doubles Championship (with William Bowrey and Ashe, respectively), and the 1963 doubles title at Cincinnati.
Graebner also reached the singles quarterfinals in Cincinnati in 1970, knocking off Bob McKinley, Barry MacKay, and Ray Ruffels before falling to eventual champ Ken Rosewall.
Grand Prix and WCT singles finals (11)
|Outcome||No.||Date||Championship||Surface||Opponent in the final||Score in the final|
|Runner-up||1.||1971||New York, U.S.||Indoor||Željko Franulović||2–6, 7–5, 4–6, 5–7|
|Winner||1.||1971||Salisbury, U.S.||Hard (i)||Cliff Richey||2–6, 7–6, 1–6, 7–6, 6–0|
|Runner-up||2.||1971||Hampton, U.S.||Hard (i)||Ilie Năstase||5–7, 4–6, 6–7|
|Runner-up||3.||1971||Houston, U.S.||Hard||Cliff Richey||1–6, 2–6, 2–6|
|Winner||2.||1971||Merion, U.S.||Hard||Dick Stockton||6–2, 6–4, 6–7, 7–5|
|Winner||3.||1971||South Orange, U.S.||Hard||Pierre Barthès||6–3, 6–4, 6–4|
|Runner-up||4.||1972||London Indoor, England||Hard (i)||Cliff Richey||5–7, 7–6, 5–7, 0–6|
|Runner-up||5.||1972||Jacksonville, U.S.||Hard (i)||Jimmy Connors||5–7, 4–6|
|Winner||4.||1973||Des Moines, U.S.||Hard (i)||Nicholas Kalogeropoulos||7–5, 4–6, 6–4|
|Runner-up||6.||1973||Paramus, U.S.||Hard (i)||Jimmy Connors||1–6, 2–6|
|Runner-up||7.||1974||Baltimore, U.S.||Carpet||Sandy Mayer||2–6, 1–6|
Grand Prix and WCT doubles finals (21)
|Outcome||No.||Date||Tournament||Surface||Partner||Opponents in the final||Score in the final|
|Winner||1.||1969||Indianapolis, U.S.||Clay||Bill Bowrey|| Dick Crealy
|6–4, 4–6, 6–4|
|Winner||2.||1970||Indianapolis, U.S.||Clay||Arthur Ashe|| Ilie Năstase
|2–6, 6–4, 6–4|
|Runner-up||1.||1971||Salisbury, U.S.||Hard (i)||Thomaz Koch|| Juan Gisbert Sr.
|3–6, 6–4, 6–7|
|Winner||3.||1971||Macon, U.S.||Hard||Thomaz Koch|| Željko Franulović
|Runner-up||2.||1971||Hampton, U.S.||Hard (i)||Thomaz Koch|| Ilie Năstase
|4–6, 6–4, 5–7|
|Runner-up||3.||1971||Indianapolis, U.S.||Clay||Erik Van Dillen|| Željko Franulović
|6–7, 7–5, 3–6|
|Winner||4.||1971||Merion, U.S.||Hard||Jim Osborne|| Robert McKinley
|Runner-up||4.||1971||South Orange, U.S.||Hard||Erik Van Dillen|| Bob Carmichael
|4–6, 6–4, 4–6|
|Runner-up||5.||1971||Los Angeles, U.S.||Hard||Frank Froehling|| John Alexander
|Runner-up||6.||1972||Washington, U.S.||Carpet||Thomaz Koch|| Tom Edlefsen
|Runner-up||7.||1972||Bristol, England||Grass||Lew Hoad|| Bob Hewitt
|Winner||5.||1973||Baltimore, U.S.||Hard (i)||Jimmy Connors|| Paul Gerken
|3–6, 6–2, 6–3|
|Runner-up||8.||1973||Birmingham, U.S.||Hard||Ion Ţiriac|| Pat Cramer
|Winner||6.||1973||Salisbury, U.S.||Hard (i)||Ilie Năstase|| Jürgen Fassbender
Juan Gisbert Sr.
|2–6, 6–4, 6–3|
|Winner||7.||1973||Hampton, U.S.||Hard (i)||Ilie Năstase|| Jimmy Connors
|Runner-up||9.||1973||Louisville, U.S.||Clay||John Newcombe|| Manuel Orantes
|6–0, 4–6, 3–6|
|Runner-up||10.||1974||Baltimore, U.S.||Carpet||Owen Davidson|| Jürgen Fassbender
|Runner-up||11.||1974||St. Petersburg WCT, U.S.||Hard||Charlie Pasarell|| Owen Davidson
|6–4, 3–6, 4–6|
|Winner||8.||1974||La Costa WCT, U.S.||Hard||Charlie Pasarell|| Roy Emerson
|6–4, 6–7, 7–5|
|Winner||9.||1975||Boca Raton, U.S.||Hard||Juan Gisbert Sr.|| Jürgen Fassbender
Juan Gisbert Sr.
|Winner||10.||1976||Boca Raton, U.S.||Hard||Vitas Gerulaitis|| Bruce Manson
- Clark Graebner, Carole Graebner, Mixed Doubles Tennis (McGraw-Hill, New York, 1973)
- McPhee, John A. (1969). Levels of the Game. New York: Farrar, Straus and Giroux. ISBN 0-374-51526-3.