The average Baseball remains in play for only five to seven pitches in a Major League game. After the game the baseballs that are taken out of play are used for batting, and fielding practice. Approximately 600,000 baseballs are used by all Major League teams combined during the course of a season. -Steven KeyMan
It would be rescheduled.
the game is rescheduled and you still get to go
You dont get to play!
they will keep playing
He borrows one from a fellow teammate.
you can ask for a refund or tickets to the next game
They use the ball for batting practice.
It is played at a later date.
Huh? That makes no sense...
A baseball game is capable of postponement at any given time during the game regardless of the inning or the circumstance however what happens after that depends on the circumstance of the outcome.
The teams keep them after the games for practice.