 In a six-season career, O'Brien was a .250 hitter (204-for-815) with four home runs and 59 RBI in 339 games played.From 1956–58, he also doubled as a pitcher, appearing in 25 games (all but one in relief) and 61 innings, surrendering 61 hits, walking 30 and striking out 35.He lost three of four decisions (.250) with an earned run average of 5.61.