Wiktionary
bottom of the ninth
n. 1 In baseball, the second part of the ninth and final inning. The end of the game. 2 (context idiomatic English) By extension, any last chance or final opportunity.
Usage examples of "bottom of the ninth".
Which was about as obvious as the value of a double play with the bases loaded and one out in the bottom of the ninth.
It's God's nature to come on in the bottom of the ninth, Tom had told her.