Ruth had a career OBP of 0.474 which means for every 1000 times at the plate 474 times he gets on base. Mariano had a career WHIP of 1.000 which means for every inning he pitched 1 batter would get on base for an OBP of 0.3333333. So Mariano's Whip would trump Ruth's OBP so Mariano would win.
BTW with an OBP of 0.474 for Ruth the average pitcher would beat Ruth more times than he would beat them.
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