Cynthia Doerner (née Sieler) (born 11 February 1951) is an Australian[2] former international tennis player.

She competed in the Australian Open seven times, thrice as Cynthia Sieler (1968, 1970 and 1971)[3] and four times as Cynthia Doerner, from 1973 to 1979.

[4] Her career singles highlights include winning the Connaught Hard Court Championships in 1972, the New York Invitational in 1975, the Surrey Grass Court Championships in 1979.

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