Answer: tiebreaker

AnswerCrossword Clue
TIEBREAKERWalk-off home run, often
TIEBREAKERTennis overtime
TIEBREAKERSet decider
TIEBREAKERCoin flip, at times
TIEBREAKEROvertime period
TIEBREAKERDeciding game
TIEBREAKEROvertime round
TIEBREAKERPlay-off.
TIEBREAKERThis may decide a Seles match
TIEBREAKERThird game, perhaps
TIEBREAKERIt settles the score
TIEBREAKERA shoot-out, e.g.
TIEBREAKERCrucial vote
TIEBREAKERTennis "overtime"
tiebreakera deciding game in a set at tennis
tiebreakerA means of deciding a winner from competitors who have tied, in particular (in tennis) a special game to decide the winner of a set when the score is six games all