Mariners consultant Tom Tango:

Finally, the leaders in the ratio between Batting Assists to Batting Blocks is: Joe Mauer.  The league average ratio is 1 assist per 5 blocks.  Mauer had 69 assists and 170 blocks.  In “Linear Weights speak”, he was +29, followed by Ichiro and Carlos Guillen at +22.  On the bottom side, we have Francoeur and Corey Hart at -21.

Score a few more awesome points for Ichiro.  For full explanation check out The Book Blog.