Who would you say had the best offensive rookie season in MLB history? Without really doing a search I'd assume Fred Lynn or Ichiro because they won the MVP along with ROY but its possible if not probable that someone had a better season but wasn't given the award. Anyways... Fred Lynn 1975: 605 PA - .331/.401/.566/.967 162 OPS+, 21 HR, 105 RBI, 10SB-5CS, 103 R, 47 2B, 7.1 WAR Ichiro 2001: 738 PA - .350/.381/.457/.838 126 OPS+, 8 HR, 69 RBI, 56SB-14CS, 127 R, 34 2B, 7.5 WAR Trout 2012: 351 PA - .356/.413/.606/1.019 183 OPS+, 16 HR, 49 RBI, 31SB-3CS, 74 R, 20 2B, 6.2 WAR Trout 2012 with Lynn's PA: 605 PA .356/.413/.606/1.019 183 OPS+, 28 HR, 85 RBI, 54SB-5CS, 128 R, 35 2B, 10.7 WAR Trout 2012 with Ichiro's PA (more realistic because they both led off): 738 PA - .356/.413/.606/1.019 183 OPS+, 34 HR, 103 RBI, 65SB-6CS, 156 R, 42 2B, 13.0 WAR 156 runs scored would be the most in a season since 1936. The thing that just really sends my awe to another level is that not only can he produce just a shade under Pujols in his prime as a 20 year old rookie, but he also just happens to lead the league in SB and is stealing at a 92% clip.