Mason Miller and the Impossibility of True Unhittability

It’s been six days since Mason Miller let somebody hit the baseball. Actually, that’s not quite true. Until the right-hander caught Michael Busch with a literal back-foot slider in the eighth-inning of yesterday’s Wild Card matchup between the Padres and the Cubs, it had indeed been five days, three relief appearances, and 11 batters since anybody came to the plate against Miller and did something other than strike out. However, six of those 11 victims managed to get their bats on the ball. Three of them did it twice. It’s just that over the past week, nobody has been able to figure out how to square up one of Miller’s disappearing sliders or 102 mph fastballs – yes, his four-seamer has averaged 102 mph over the last three outings – well enough to achieve so much as a tapper back to the mound. Busch’s unfortunate foot snapped the streak at 11, but it did nothing to look Miller look more hittable.

In a fun twist, the all-time record for consecutive strikeouts (or at least since 1961, when full play-by-play data became available) belongs to Miller’s teammate Jeremiah Estrada. Estrada struck out a 13 straight batters across three appearances just last May. In fact, he struck all 13 of them out swinging.

That’s a pleasurably tidy play log. Estrada’s streak only ended because, when he entered the game on May 31 against the Royals, manager Mike Schildt intentionally walked the first batter he faced.

Anytime Miller is on the mound, the general feeling among spectators is astonishment that anyone ever manages to put the ball in play. He just threw an immaculate inning. Since his debut in 2023, Miller has allowed just 0.55 hits per inning, the lowest rate among all 473 pitchers who have thrown at least 100 innings. And now, following a 2025 season in which his 45.2% whiff rate ranked second among all pitchers, Miller has ascended to a higher plane. His whiff rate over the past three games has rocketed up to an absurd 61.9%.

Now that the streak has run its course, it’s time to celebrate the six marvels who managed to connect with one of his pitches, no matter how inconsequential the contact. We’ll count down, from the weakest contact to the strongest, starting with Moisés Ballesteros getting the smallest amount of baseball possible it’s possible to get. You can just hear the sound of the foul tip before the ball hits the glove.

Honestly, it’s impressive that Ballesteros got enough of this pitch to make a sound at all. This is a 102.6 mph fastball well above the strike zone. It came in at a height of 3.76 feet, and this season, Miller ran a whiff rate of 55.9% on fastballs 3.7 feet or higher. Even pitchers who don’t throw 102 lean on four-seamers above the zone because it’s so hard for batters both to lay off it and to hit it. This pitch is why we care about vertical approach angle. This pitch is why we’ll never forget the climax of A League of their Own. The pitch to Ballesteros technically went down as a whiff because Statcast counts foul tips for strike three as whiffs rather than fouls, but we don’t have to take that away from him. He gently brushed the baseball, and for that we honor him.

Next up is Dansby Swanson, who got a tiny bit more of the pitch and a whole lot more of catcher Freddy Fermin.

You may think Miller fooled Swanson with a 2-2 slider away, and he may well have done so. It’s also equally possible that Swanson really was trying to keep an eye out for the slider. It’s just that when you know you might see 104 up above the strike zone, trying to look for the slider and actually staying back long enough to be on time for it are two very different propositions. The shortstop was just able to slow down enough to throw the bat head at the ball. It was a great accomplishment, and because of it, Fermin will surely hold a lifelong grudge.

Here’s another two-strike slider that just barely avoided ending up as strike three. Ahead 1-2, Miller missed high and inside to Seiya Suzuki, and this shows you why pitchers tend to think hard in, soft away.

Batters need to catch the ball much further in front of the plate when it’s on the inside, so the fact that Suzuki was way out in front of this pitch didn’t hurt him too much. He still caught the smallest piece of it – so small that he barely kept it from sticking in the catcher’s mitt – but at least he caught that piece with the barrel of his bat. Did he barrel this pitch up? Absolutely not. Did he strike out anyway on the very next pitch? You bet he did.

We’re done with the foul tips now. Up next, we have a group of four regular-looking foul balls. These ones stretch back to Miller’s last regular season appearance against the Diamondbacks on September 27, and they’re all just fastballs that nobody could catch up to.

This is why pitching coaches tell pitchers aim for the middle of the zone and dare batters to hit it, and this is the benefit of throwing harder than just about anyone who has ever lived. Miller didn’t necessarily fool anybody here. They were geared up for the fastball and they got it. It was just too much to handle. Swanson, Connor Kaiser, Carson Kelly, and even contact maven Geraldo Perdomo are doing all they can just to slap this ball into the seats on the opposite side and live to see another pitch. Swanson took a robust hack and looked out to the mound as if to say, “I’m on to you, Mason Miller.”

He was not, in fact, onto Miller, but you can see why this foul felt like a victory.

Now we’re into the really impressive fouls. Here’s Kelly again, very nearly keeping the ball in the field of play!

Kelly is out ahead of a slider on the inside corner here, and he sends a weak popup to the right side that just drifts out of play despite Luis Arraez’s heroic efforts to reel it in. Seriously, Arraez tossed himself over a thick concrete barrier. He must have ended up with a serious bruise, and he took his frustration out on the netting. I wrote about this exact kind of batted ball back in May. Normally when you’re ahead of a pitch, you hit it to the pull side, but sometimes you’re so far ahead that you have to drop your bat head to slow down. At that point, you can’t help but pop it up the other way. If Kelly had been above the ball, he would have hit a weak grounder to the left side – or, more likely, fouled it straight down and off his own foot – but since he was underneath it, he came just a few feet (or one gust of wind) from achieving the impossible dream of facing Mason Miller and coming away with a weak popout.

Last up is Geraldo Perdomo, long one of the best hitters in baseball when it comes to making contact, and more recently, somehow one of the best hitters in baseball, period. Here’s Perdomo genuinely rifling a slider to the pull side.

This ball came off the bat at 100 mph. Perdomo was still way out in front of it. It was probably foul by a good 25 feet at the moment it passed first base. Still, that’s the best contact anyone has made against Miller in nearly a week. Perdomo would go on to strike out like all the others, but he can take pride in knowing that he’s the last player ever to actually hit the ball hard off Miller.