Third game, perhaps

• Overtime, e.g., and a hint to what spans the two words of each starred answer
• Deadlock ender
• This may decide a Seles match
• Deciding game
• It settles the score
• Walk-off home run, often
• A shoot-out, e.g
• E.g. tennis and soccer

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