And for good reason....MLB doesn't release that information. Now if you can get friendly with the traveling secretary for the umpire union you could have information few have. The earliest way to get the umpire rotation, as far as I know, is log on to MLB about a hour before the game and click on to the “game day” to your game and they will have the umpires listed on the bottom. For instance Joe West is calling balls and strikes tonight.