overtime play until one team is ahead at the end of an inning; e.g. baseball

Extra innings is the procedure by which a tie is broken in the sport of baseball.

Extra Innings was the second episode of the third season of the 1985 revival of The Twilight Zone television series. In it, Marc Singer plays a professional baseball player, forced to retire from the game due to injury. He finds a baseball card with a picture of a player from decades before, who looks just like him.