I think you're giving Sano too much credit. He's a very exciting young power hitter, but he's got holes in his swing and a savvy pitcher (like Estrada) can work him. Obviously you risk giving up a home run, but a pitcher pitching at Estrada's level right now should not be afraid of that outcome going against a hitter who came into today's game batting .232 with a 34% strikeout rate. Sano is making contact on just 66.7% of his attempts this season, with a z-contact rate of 75.5%. Mauer? Not only is he considerably harder to strike out, but his ability to make contact is through the roof: 87.3% overall, and 90.6% z-contact. In that situation, I fear Mauer hitting a single much more than I fear Sano hitting a HR. Mauer's entire approach is basically revolved around taking what the pitcher gives him and dumping singles all over the field; I feel that this works much better against Estrada's pitching style than a wild-swinger like Sano who can be abused. Estrada's tricks work against a lot of hitters, a guy like Mauer to me is simply too robotic at the plate to fool.