Baseball Wagering
Betting on baseball is done by laying or taking money odds called the Moneyline. The minus (-) sign indicates the Favorite and the plus (+) sign indicates the Underdog.

Example:
Yankees +140
Braves -150

The bettor would bet $150 to win $100 on the Braves(favorite). The bettor would wager $100 to win $140 on the Yankees(underdog). On money odds whenever there is a minus (-) you bet that amount to win a dollar, where there is a plus (+) you get that amount for every dollar wagered.

Baseball Over/Under
When betting on total runs (over/under) the game must go 9 full innings (8 1/2 if the home team wins) to have action. If a game is called, or suspended, the score will be determined after the last full inning. If, for example, the game goes 10 full innings, it is tied, and the game is called, suspended or postponed the game will be graded as a tie with the appropriate winners and losers.

The Run Line
When one team is a big favorite or underdog the run line is used. A number of runs such as 1 ½ or 2 is subtracted from the score of the favorite team. This is variation of the point spread in other sports. Using the example from earlier, the braves were -150 against the Yankees on the money line. However, on the run line, the Braves might be +110 at -2, which means you could risk only $100 and win $110. Meanwhile, the Yankees would be -130 at +2.

When is a Baseball Game Official? For wagering purposes, money line winners and losers are official after 5 innings of play unless the home team is leading after 4 ½ innings. If a game is called, suspended or postponed, the winner is determined by the score after the last full inning (any runs scored in the top of an inning, if the Home team does not have an opportunity to make 3 outs or take the lead in the bottom of the inning will not count toward the score, and the score will revert to the last full inning). Monies will be refunded if the game is tied after the completion of the last full inning. Events do not carry over to a future date, only the runs scored on the date the game was scheduled (or more if the game continues past midnight) count towards the wager.

Baseball 5 Inning Rules
Most bookmakers us the following rules for shortened games:
All wagers on baseball first 5 innings will be decided on the basis of the score at the end of five full innings.

If a game does not go five full innings, all first 5 inning wagers will be canceled.