|Country (sports)||United States|
|Born||October 17, 1967|
Los Angeles, California
|Height||5 ft 10 in (1.78 m)|
|Plays||Right-handed (double handed backhand)|
|Highest ranking||No. 21 (October 9, 1995)|
|Grand Slam Singles results|
|Australian Open||SF (1995)|
|French Open||2R (1989, 1994)|
|Wimbledon||3R (1991, 1993)|
|US Open||2R (1985, 1986, 1994, 1995)|
|Highest ranking||No. 45 (May 25, 1992)|
Marianne Werdel (born October 17, 1967) is an American former professional tennis player.
Werdel was born in Los Angeles and played on the WTA tour from 1982 to 1997. She is also known as Marianne Witmeyer and Marianne Werdel-Witmeyer.
She won 19 national juniors titles. In 1988 Werdel suffered a partially herniated disc, forcing a two-month absence from the tour.
At the 1995 Australian Open, unseeded Marianne Werdel defeated fifth-seeded Gabriela Sabatini of Argentina in a first round match. Werdel won the first set, but Sabatini raced out to a 3-0 lead in the second set before twice losing her serve. Werdel won four consecutive games to close out the match in straight sets, dismissing Sabatini 6-4, 6-4. Werdel had also beaten Sabatini two years earlier at a tournament in Japan. After she had disposed of Sabatini, Werdel continued to work her way through the draw beating Park Sung-hee, Elena Makarova, Barbara Paulus and Angélica Gavaldón en route to a semifinal encounter with the top-seed and World No. 1 Arantxa Sánchez Vicario. In their two previous meetings, Werdel had lost both times to Sánchez Vicario. This time proved no different as Sánchez Vicario defeated Werdel in two sets. In reaching the semifinals, the 1995 Australian Open proved to be the best result Werdel would have in Grand Slam singles competition. She defeated Sánchez Vicario two months later in the third round of the Lipton Championships in Key Biscayne.
|Tier IV & V||0|
|Runner-up||1.||July 30, 1989||Schenectady, New York, USA||Hard||Laura Gildemeister||4-6, 3-6|
|Runner-up||2.||August 25, 1990||Schenectady, New York, USA||Hard||Anke Huber||1-6, 7-5, 4-6|
|Runner-up||3.||October 21, 1990||Scottsdale, Arizona, USA||Hard||Conchita Martínez||5-7, 1-6|
|Runner-up||4.||April 18, 1993||Pattaya, Thailand||Hard||Yayuk Basuki||3-6, 1-6|
|Runner-up||5.||September 19, 1993||Hong Kong||Hard||Wang Shi-ting||4-6, 6-3, 5-7|
|Runner-up||6.||January 12, 1997||Hobart, Australia||Hard||Dominique Van Roost||3-6, 3-6|
|Runner-up||1.||May 24, 1992||European Open, Switzerland||Clay||Karina Hab?udová|| Amy Frazier
|Runner-up||2.||May 23, 1993||European Open, Switzerland||Clay||Lindsay Davenport|| Mary Joe Fernandez
|Runner-up||3.||September 19, 1993||Hong Kong||Hard||Debbie Graham|| Karin Kschwendt
|6-4, 4-6, 2-6|
|Runner-up||4.||February 12, 1995||Chicago, Illinois, USA||Carpet||Tami Whitlinger-Jones|| Gabriela Sabatini
|7-5, 6-7, 4-6|
|Runner-up||4.||May 25, 1996||Strasbourg, France||Clay||Tami Whitlinger-Jones|| Yayuk Basuki
|7-5, 4-6, 4-6|
|Runner-up||5.||February 23, 1997||Oklahoma City, Oklahoma, USA||Hard||Tami Whitlinger-Jones|| Rika Hiraki
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