I regret to say I have no serious suggestions, only silly ones.
The Bout to Knock the Other Team Out.
Thunderdome: Two Teams Play, One Team Wins
King of the Hill
Top of the Heap
Survivor: Outlast, Outplay, Outscore
Last Team Standing
Winner of the Chicken Dinner
For Whom the Scoreboard Tolls
Cry Play Ball and Let Slip the Boys of Summer