Tennis "overtime"

• What may decide winner of cup, about right after draw
• Overtime round
• E.g. tennis and soccer
• Overtime, e.g., and a hint to what spans the two words of each starred answer
• Deadlock ender
• Crucial vote
• Overtime play in order to break a tie
• This may decide a Seles match

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