Answer:

tiebreaker

Answer	Crossword Clue
TIEBREAKER	Walk-off home run, often
TIEBREAKER	Tennis overtime
TIEBREAKER	Set decider

TIEBREAKER	Coin flip, at times
TIEBREAKER	Overtime period
TIEBREAKER	Deciding game
TIEBREAKER	Overtime round
TIEBREAKER	Play-off.
TIEBREAKER	This may decide a Seles match
TIEBREAKER	Third game, perhaps
TIEBREAKER	It settles the score

TIEBREAKER	A shoot-out, e.g.
TIEBREAKER	Crucial vote
TIEBREAKER	Tennis "overtime"

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.