Walk-off home run, often

• Overtime play's purpose
• Overtime play in order to break a tie
• A shoot-out, e.g
• Deadlock ender
• It settles the score
• This may decide a Seles match
• Third game, perhaps
• Overtime, e.g., and a hint to what spans the two words of each starred answer

Wiktionary Word definitions in Wiktionary
n. Something that is used to pick a winner from a tied situation.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ Finally, complete the tiebreaker , saying in up to 20 words why you'd like to win first prize. ▪ Instead, there was a tiebreaker . ▪ The tiebreaker will be inPart 3, our December 1992 issue. ▪ The muscular Stoliarov pulled out ...