When betting on an MLB run line, +1.5 means that the underdog team must either win the game outright or lose the game by one run or less in order for the bet to be successful.
With a run line, also called “against the spread,” the standard spread is always 1.5 runs. The favorite team will be set at -1.5, which means they must win the game by two or more runs to “cover” the run line. The underdog team covers the run line by either winning outright or losing by one run or less.
If the team you bet on covers the run line, the bet is successful.
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