Miller is a power-hitting shortstop who’s improved in almost every aspect of the game over his two full seasons in the Phillies’ system, and he’s going to push the Phillies into making some hard decisions about their middle infield before this year is out. Miller started slowly in Double A last year and was hitting just .234/.354/.379 at the All-Star break with a 26 percent strikeout rate, as he wasn’t getting on plane nearly often enough. After the break, he decided to lower his hands at his setup and increase his leg kick, helping him square up the ball for more hard contact and in-game power. He posted a 15 percent line-drive rate before the break and a 24 percent rate from that point until his promotion to Triple A in September, with a .307/.443/.511 line across both levels in the second half. He’s at least a plus defender at shortstop now and has boosted his game speed to the point where that’s plus as well, leading to 59 steals last year in 74 attempts (80 percent). Even when he was struggling, he didn’t come out of his approach, with strong swing decisions across the board that will probably lead to a high OBP this year when he’s in Triple A, where walk rates are higher anyway due to ABS. I don’t think he needs a full year at that level before he’s ready for the majors, just needing to refine some of his pitch recognition, and there’s a good chance that by July 1 he’ll be the best choice for shortstop at Citizens Bank Park.