Bryce Harper has matured. Earlier, he was swinging at every breaking ball low and outside. Now, he takes the first three outside breaking balls for a 3-0 count, then fouls off a marginal strike to bring the count to 3-1, then swings at the 3-1 changeup low.
Never seen a guy turn so many 3-0 counts into outs as I've seen Bryce Harper do.