Minnesota Twins catcher-turned-first baseman Joe Mauer has some advice for San Francisco Giants All-Star Buster Posey: play catcher as long as you can, and enjoy doing it.Minnesota Twins' Chris Parmelee and San Diego Padres catcher Rene Rivera watch Parmelee's sacrifice fly to left field that brought in Joe Mauer from third with the game's first run, during the sixth inning of a baseball game Wednesday, May 21, 2014, in San Diego.