Robinson was "Proud of [his] greatness as a tennis player" (1968) (4)

I believe the answer is:

ashe

(Other definitions for ashe that I've seen before include "US rallying champion" , "Sporting champion once" , "He was good enough to win Wimbledon" , "US court star" , "Arthur, who came to court" .)

I've seen this clue in the Newsday.

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