Sanchez can get away with it, because he's really really lucky....
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J/K, he can get away with it because the primary fastball comparison is as follows:
Sanchez:
95.32 mph, -9.51 inches horizontal movement (in towards RHB)
.233 BAA, .331 SLG, 0.098 ISO, .252 BABIP
Hutchison:
93.15 mph, -4.40 inches horizontal movement (in towards RHB)
.280 BAA, .466 SLG, .0.186 ISO, .329 BABIP
http://www.bluejaysplus.com/wp-content/uploads/2015/04/SanchezApr22K.gif