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slightly under 1/2 the MLB plate appearances as Rose and is slighly more clutch per at bat. You do also need to look at the IBB's as jemanji mentioned - he's lead the AL 3 times over the past decade including 2 of the roid years (02 & 04). That speaks to how managers view Ichiro and how much better he has been than the man following him to the plate.
The piece I like about this stat is that it does match the memory. In the 25 years I've been watching the Mariners, I can't think anyone I'd rather have up in a clutch situation more than Ichiro.