Mauer can't do anything with an inside pitch. He typically grounds any pitch on the inside of the plate between first and second, usually weakly. Pitchers know this and pitch him inside. Watch the pattern. Pitchers know he takes a lot of pitches early in the count. They work him away, trying to get ahead. Once they're ahead they pound him inside. Unless they make a mistake, this translates into many easy ground outs to second. Mauer is smart enough to know this and still can't counter it. That is his problem and that is why I am one of those that can't wait until 2018 is over.