|Full name||Mary Arnold Prentiss|
|Country (sports)||United States|
|Born||October 26, 1916|
|Died||January 29, 1975(aged 58)|
|Grand Slam Singles results|
|French Open||QF (1948)|
|Grand Slam Doubles results|
|French Open||F (1948)|
|US Open||F (1946)|
|Grand Slam Mixed Doubles results|
She was educated at the Los Angeles City College where she became a member of the Los Angeles Olympia L.T.C.
She participated in the 1939 Wightman Cup, the women's team tennis competition between the United States and Great Britain. She won a doubles match partnering Dorothy Bundy and helped the U.S. team to a 5–2 victory.
At the 1948 French Championships, she paired with future International Tennis Hall of Fame inductee Shirley Fry to reach the doubles finals. She also played at the Wimbledon Championships that year and reached the third round in the singles and doubles and the quarterfinal in the mixed doubles event.
At the Tri-State Tennis Tournament (now Cincinnati Masters), she reached five finals, winning three doubles titles: 1940, 1944 and 1946. She also was a singles finalist in 1941 (losing to Pauline Betz), and was a doubles finalist in 1945 (with Fry). To win her doubles titles in Cincinnati, she paired with Alice Marble in 1940, with Dorothy Bundy in 1944, and with Fry in 1946.
Grand Slam finals
Doubles (2 runner-ups)
|Runner-up||1946||U.S. Championships||Grass||Patricia Canning Todd|| Louise Brough Clapp
Margaret Osborne duPont
|Runner-up||1948||French Championships||Clay||Shirley Fry Irvin|| Patricia Canning Todd
- "Mary Prentiss, Former Tennis Champ, Dies" Los Angeles Times, January 29, 1975
- G.P. Hughes, ed. (1955). Dunlop Lawn Tennis Annual and Almanack 1955. London: Ed. J. Burrow & Co. Ltd. p. 324.
- "USTA Yearbook - Top 10 U.S. Women's Rankings Page 2". usta.com. United States Tennis Association. Retrieved 2014-08-27.
- "USTA Yearbook - Top 10 U.S. Women's Rankings Page 3". usta.com. United States Tennis Association. Retrieved 2014-08-27.
- Collins, Bud (2010). The Bud Collins History of Tennis (2nd ed.). [New York]: New Chapter Press. p. 401. ISBN 978-0942257700.
- "Wimbledon players archive – Mary Prentiss". www.wimbledon.com. AELTC.