I am a Joe Mauer fan, but I find his ISO to be terrifyingly low (.127). It recovered from last year, but is still below his career average (.145). I had thought he could wind up (if moved to 1B) being an overpaid Mark Grace (but with intangibles, e.g. ticket and jersey sales, not disturbingly so), but Mark Grace had a lower K rate and a career ISO greater than Mauer's ISOs the last two years (.139, virtually equivalent to Mauer's 2010 of .141). What any of this means, I am unsure, but the extent to which a C/1B can sustain a BABIP of .345 is doubtful. Mauer doesn't really have any easy comparisons, so trying to guess at a career trend line is a mostly useless exercise. I am, however, concerned about the increased K rate, decreased ISO, and Spanian GB rate.