Before Pujols, I do believe Mike Piazza held the distinction of one of the greatest rookie seasons of all time, as well. playing catcher certainly helped that distinction 602 PA - .318/.370/.561/.932 152 OPS+, 35 HR, 112 RBI, 81 R, 24 2B, 6.8 bWAR, 7.6 fWAR McGuire also managed a 164 OPS+ his rookie year, but only compiled a 5.4 fWAR and a 4.8 bWAR