Deciding game

• Tennis "overtime"
• Deadlock ender
• Walk-off home run, often
• Crucial vote
• Overtime play's purpose
• What may decide winner of cup, about right after draw
• Overtime, e.g., and a hint to what spans the two words of each starred answer
• Overtime round

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

WordNet Word definitions in WordNet
n. overtime play in order to break a tie; e.g. tennis and soccer