In tennis, a method of deciding the result of a game drawn at six-all (3-5)

I think it could be either:

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3-5

tiebreak

(Other definitions for tiebreak that I've seen before include "Means of settling tennis set" , "Match decider" , "Game decider" , "Means of deciding winner after level scores" , "Tennis set decider" .)

I've seen this clue in The Mirror.

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