What pitcher had the lowest ERA in post world war 2?

RHP Edward "Big Ed" Augustine Walsh, who debuted in Major League Baseball MLB) for the American League (AL) Chicago White Sox on May 7, 1904, pitched 14 seasons in MLB -- all but one with the Chicago White Sox -- with a career Win-Loss record of 195-126 in 2964 innings pitched in 430 games (315 games started and 250 complete games). Walsh hold the MLB record for the lowest career ERA, posting a career ERA of 1.82.