Unreturnable serve

This time we are looking on the crossword clue for: Unreturnable serve.
it’s A 18 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: ACE.

Last seen on: –LA Times Crossword 15 Nov 21, Monday
Universal Crossword – May 18 2020
Universal Crossword – Mar 19 2019 crossword Solution