Chris who won four straight US Opens in the 1970s (5)

I believe the answer is:

evert

(Other definitions for evert that I've seen before include "Turn inside out (biol.)" , "arrange to have the wrong side out?" , "Tennis champion" , "Former US World No 1 tennis player, b. 1954" , "Chris --, female tennis star" .)

I've seen this clue in the LA Times.

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