 In a fourteen-year career, Mueller played in 985 games, accumulating 733 hits in 2,911 at bats for a .252 career batting average along with 56 home runs, 373 runs batted in and a .314 on-base percentage.He ended his career with a .988 fielding percentage which was 8 points higher than the league average during his playing career.He led National League catchers three times in assists, twice each in baserunners caught stealing and once in fielding percentage and putouts.