I see a number of threads popping up about this, so hopefully this is helpful. The rules vary from one book to another but this is the most commonly used set (taken from 5Dimes):
All regular season baseball games and professional post season games are considered official after 5 innings of play (4½ if the home team is winning). If a game is called or suspended after 5 innings, the winner is determined by the score after the last full inning of play – unless the home team scores to tie or takes the lead in the bottom half of the inning. The winner is then determined by the score at the time the game is called. When betting on baseball totals or run-lines, the game must go 9 innings (8½ if the home team is winning). Regardless of their starting/completion date, NCAA baseball, NCAA softball, and youth league tournament games have action with the final result score.
First 5 inning lines are graded at the end of the 5th inning. All 5 inning wagers have action at that time, regardless whether the game is completed. The following propositions have action at the time they occur, regardless whether the game is completed or official: 1st 5 inning wagers, team to score first, 1st inning wagers or any wager involving a team or player to achieve an outcome first. The following propositions will be graded NO ACTION if a game does not go 8½-9 innings and is an official completed game on that day: team statistical match-ups, player match-ups (including total bases), team total runs, H-R-E wagers, or any wager involving an over/under format.
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