Mason Miller Is Unbelievable

My puny mortal brain is having trouble making sense of the numbers coming out of San Diego right now. It’s an uncanny valley thing. Mason Miller’s statistics just don’t quite seem like they’re numbers that you can put up in the majors. Oh, they’re all in the right columns. They’re not impossible or anything. It’s just that no one else has numbers that look quite like this, and even more so than that, if you think about what they all mean together, it doesn’t seem like the performance they describe can possibly be real.
Let’s start with the most striking statistic: 19 strikeouts in 24 batters faced. That 79.2% strikeout rate is obviously technically feasible, but I keep saying it in my head and it keeps not making sense. I look at strikeout rates a lot, particularly early in the season. But even for very good pitchers, they tend to top out around 40%, maybe 50% if they’re performing especially well. I can fit those numbers into my head. That means that about half the batters they face are going to strike out – easy enough. Face four batters in an inning? Two punchouts.
But 79% doesn’t work so easily. In a four-batter inning, that’s three strikeouts! But you don’t get a lot of four-batter innings if you’re striking out three batters an inning. Another way of thinking about that: Batters reach base safely about 40% of the time when they don’t strike out. But if they’re striking out 80% of the time, they’re already making outs in 80% of their plate appearances right off the top, and then add another 12% from in-play outs (60% times 20%). That’s an out rate of 92%! I can’t wrap my head around 92% outs. That’s the ratio of outs in your average two-hit complete game. But your average two-hit complete game includes a ton of batted-ball luck. Miller’s dominance doesn’t involve a lot of batted-ball luck – or a lot of batted balls.
That leads me to my next point of cognitive dissonance: all the swinging strikes. Right now, Miller is running a 39.6% swinging-strike rate on his slider. That means that batters swing at – and miss – 39.6% of the sliders he throws them. But they only swing half the time! That means they’re coming up empty 79.2% of the time when they offer at that pitch. Likewise, his four-seam fastball carries a 24.4% swinging-strike rate, off of a 43.5% whiff rate. These numbers are all ludicrous if you stop to think about them. Read the rest of this entry »







