It's difficult getting umpires when it is the first game of a series. When that is the case, I have to wait for mlb.com to post the umpires (thanks to Big Joe for that advice here). They usually post them within 1 hour of the game's starting time, sometimes later. As soon as they post the umpires I try and post here if I think they are a good shot. When it is the second or more game into the series you can usually go to covers.com or letitridesports.com anytime during the day to get the home plate umpire.