The term 'cause of extra innings' refers to the situation in which a baseball game is tied after nine innings and must be extended. The two crossword solutions for this term are 'TIE' (3 letters) and 'TIEGAME' (7 letters). A TIE occurs when both teams have the same score at the end of the ninth inning, and the game must be extended until one team has more runs than the other. A tiegame is the result of the game being tied after extra innings.