I don't know the answer to this but, after Garrett Jones's recent outburst i've been wondering...
who was the quickest to hit 10 hr's as a rookie. I'm thinking someone like Kevin Maas, that was a late season call up that went on a tear. or maybe even Pujols in his rookie season.
in any event, as I was typing, this I remembered Jones has a couple dozen ab's before this year. so i'm pretty sure he's not near one of the fastest.
but this year he hit his 9th homer in his 67th ab and just missed his 10th last night by about 4 inches.