E.g. tennis and soccer

• Deadlock ender
• Overtime, e.g., and a hint to what spans the two words of each starred answer
• Walk-off home run, often
• Overtime play's purpose
• Tennis "overtime"
• Overtime round
• It settles the score
• Deciding game

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

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