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I didn't see the game, but is he really throwing a cutter? Never did before near as I recall. And it was the cutter/sinker combo that turned Cliff Lee into an unhittable machine.
If what you describe of Marco's control is sustainable, that'd be enough almost no matter what he was throwing. His off-speed stuff is good enough that if he truly commands the fastball he'll be the best 3 in the AL. I'll have to see it to believe it, but maybe all he needed was confidence and he seems to have that right now in spades.