After 7 straight seasons of swinging strike rates that never exceeded 4.3%, Mauer swung and missed nearly 6% of the time last year, and he's started out this season at 6.9%. It's too early to be worried, but it's something to watch. Two percent doesn't sound like much, but over the course of the season it's dozens of additional swings and misses. It will be interesting, especially after two more looking K's today, to see if Mauer gets tired of letting umpires still struggling with their strike zones determine the outcomes of his AB's.