This is what Mike Podhorzer has to say about A-a-ron Sanchez...
On the other hand, Aaron Sanchez has become the 2017 version of 2016 Dallas Keuchel. The extreme groundballer with a low BABIP that everyone is falling all over themselves to try justifying as sustainable because he just looks so darn good on the mound. Except that he doesn’t induce pop-ups, and allowed a Soft% and Hard% barely better than the league average. If he was such a weak contact king, it should appear in some stat that isn’t BABIP. So I’m not believing it, and paired with his average strikeout rate, expect his ERA to rise toward his 4.00+ SIERA.