Former tennis champion; Steffi ....... (4)

I believe the answer is:

graf

(Other definitions for graf that I've seen before include "German tennis player, b. 1969" , "Seven-times women's Wimbledon champion, b. 1969" , "Steffi --, tennis champion" , "Noted tennis player" , "Steffi --, tennis player" .)

I've seen this clue in the Sydney Morning Herald.

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