Mary–Ann Eisel (born November 25, 1946) also known as Mary–Ann Curtis or Mary–Ann Beattie is an American former tennis player.

[4] In the same year, she won the Irish National doubles title with Justina Bricka.

[4] Eisel reached the finals of the 1967 women's doubles U.S. National Championships at Forrest Hills with Donna Floyd, losing in three sets against Rosemary Casals and Billie Jean King.

In 1968, she won the US Open mixed doubles with Peter Curtis, defeating Tory Fretz and Gerry Perry in straight sets[5] In 1969, she won the singles title at the Surrey Grass Court Championships, defeating Judy Tegart in three sets.

[6] In 1968 and 1970, she played for the US Federation Cup team, reaching the semifinals of the World Group on both occasions, and compiled a record of five wins and four losses.