Quote:
Originally Posted by DaveASA/FED
The reason the I know of is to get both balls into the game. The real rotation only happens at the bottom of the 1st if the starting ball hasn't gone out of play. That just allows both balls to be a little broke in. Nothing worse than going 6 innings and a ball finally going out of play and you give them a new shiny one!
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...and that shiny new one is much harder than the others. One teams gets a bigger advantage being at-bat when the new one comes into play. Not sure that's an absolute fact, but that's a rationale behind ball rotatation.