What is the correct call here?

[Buzz Killington]

Switch pitcher vs. switch hitter

[CCTAU]

I think once a pitch is thrown, you have to stay. But only after the first pitch.

[Snaggletiger]

I think once a pitch is thrown, you have to stay. But only after the first pitch.

I don't know the actual rule but I would think the batter is well within his rights to switch as long as the pitcher isn't on the rubber.  Notice that the pitcher never switches while he's on the rubber as that would be a balk.  My thoughts are the batter can switch to either side as long as the pitcher hasn't toe'd the rubber. If he tried, the umpire can allow the pitcher to go ahead with the pitch.  I may be wrong but I seem to recall times where they switch pitchers in the middle of an at bat and the batter switched sides because the new pitcher throws with the opposite arm.

[CCTAU]

http://m.mlb.com/news/article/8995670/

[dallaswareagle]

USSSA softball rule. I know different but a lot rules mirror baseball.

As long as the ball is not in play (Umpires puts ball in play for pitcher to pitch to batter) the batter may bat from either batters box. The batter may not switch to another batters box once the ball has been put in play or the pitch has been released.