Think about what you know about hitters and pop-ups. Pop-ups, for all hitters, are bad. They might as well be one-pitch strikeouts. And, you know who doesn’t hit them? Joey Votto. You know that Joey Votto pretty much never hits a pop-up. It’s among the many things that make him extraordinary. Joe Mauer also doesn’t really hit pop-ups. Christian Yelich. Ryan Howard. Shin-Soo Choo. On and on. And there’s Howie Kendrick. Kendrick doesn’t hit pop-ups. But:

@based_ball ICYMI: Howie Kendrick hit a pop-up today. (leading off the 7-th inning).

— Santiago Padilla (@SantiPadillaR) September 25, 2016

That was tweeted at me yesterday. And when I checked the live statistics on FanGraphs, Kendrick had an infield fly. Yet when I check those same statistics today: nothing. It’s as if it’s been erased. Here is the batted ball in question:

Fielded comfortably by the second baseman. We’d all identify that as a pop-up, right? In one sense, then, Kendrick did pop up yesterday. You could say it’s the most important sense. Yet, here’s the leaderboard, when I look at everyone who’s batted at least 500 times over the past three calendar years. This is why this matters. (It doesn’t matter-matter, but, you know.)

Kendrick is the only guy with double zeros. Everyone else has hit at least one infield fly. So, what are we supposed to do, here?

In truth, it’s not that much of a mystery. We get batted-ball data from Baseball Info Solutions, and they have a specific definition of what makes an infield fly. Yesterday, when I checked the live stats, those were getting fed in by MLB Gameday, and that has a different, looser definition. So Kendrick’s fly ball was a pop-up by one definition, but not by both. If you take the BIS data as gospel, Kendrick objectively remains without such a blemish. But you can’t really say Kendrick hasn’t hit a pop-up. He just hasn’t hit one particular kind of pop-up.

Heck, this was just a matter of weeks ago:

The last time I checked, the BIS cutoff was 140 feet. That is, any fly ball hit more than 140 feet wouldn’t count as an infield fly. Kendrick still hasn’t popped up within the infield. But these flies flew only a little beyond 140. And now that we have Statcast, we can try to run some numbers ourselves. We’re still going to have to define things arbitrarily, and Statcast sometimes has trouble picking up batted balls hit at extreme angles, but let’s just see what we can do for 2016. Why don’t we set a cutoff at a launch angle of 60 degrees?

Joey Votto has zero such batted balls. Christian Yelich, zero. Joe Mauer, one. Howie Kendrick, one. Starling Marte, one. I don’t know how many batted balls are missing from the sample, so it’s not authoritative. But, it’s something. No definition of a pop-up is going to be the definition of a pop-up. This is the issue with bucketing. But Howie Kendrick either has a pop-up or two, or he doesn’t. According to the numbers we have here, Kendrick hasn’t popped up once in three years. That’s amazing! It still, no matter what, reflects a legitimate ability of his, but his is a soft zero. There’s no arriving at a one true answer.

Howie Kendrick most certainly doesn’t hit pop-ups. Except for the rare occasions when he does. Welp?

One of my favorite things about baseball is how Clayton Kershaw has never been able to master a changeup. There’s absolutely no one in baseball who needs a changeup less than Clayton Kershaw, but, drive is drive. He’s been frustrated by his own lack of progress, because as far as he’s concerned, he’ll forever see room for improvement. He still has an ERA. Runs are mistakes.

Kershaw wants to be better. It doesn’t matter to him how silly that sounds. He’s willing to try different things, and that brings us to this past weekend, when Kershaw and the Dodgers blew out the Rockies. We’re going to fast-forward to the seventh inning, when the Dodgers were up by eight runs. Actually, no, before we do that, here’s an image from Texas Leaguers. Kershaw’s estimated 2016 release points:

Three pitches stand out. Here’s the high one, from April:

You might’ve forgotten about that. The baseball season is long. Anyway, now, seventh inning, facing the Rockies. Here’s Kershaw throwing a pretty ordinary Kershaw-y pitch to Nolan Arenado:

Real good pitch. Here’s the following delivery:

You see that? So, Arenado singled. He was shortly eliminated. With two outs, up came Gerardo Parra. A typical Kershaw pitch:

And, the very next pitch:

You see Parra look out at the mound. Arenado did the same thing. That’s presumably because Kershaw gave them both a sudden, weird, different look. I’ll use screenshots now. The first of the two shown Parra pitches:

The second of the two shown Parra pitches:

Look at the arm. Look at the release point. Two times in the seventh inning, with the leverage about as low as it can get, Clayton Kershaw dropped down. He threw one ball, and he threw one strike, which earned a strikeout. Here’s a one-image comparison, with the ordinary release point shown by the yellow dot:

Just as Clayton Kershaw doesn’t need a changeup, he doesn’t need a second slot. He’s already the best at what he does in the game. But, I mean, what’s the harm? Especially at 8-0? I’m going to guess he’s tried this a few times in the bullpen. Might as well see if it plays in a game, with the playoffs coming up. Anything for an edge. I suppose even the best players have to work hard to remain the best.

I will say, Kershaw’s low-slot delivery doesn’t look so smooth. It doesn’t quite seem comfortable, and maybe you shouldn’t expect it to. That’s not how he’s thrown, but that second fastball was perfectly located, and you don’t need to be flawless if you’re offering a second look, for the surprise of it. The ball gets to the catcher in less than half a second. That doesn’t give hitters much time to process. I wonder if this was Kershaw’s idea, or if he’s been having conversations with Rich Hill. Hill loves his unpredictability. Imagine Hill’s deception with Kershaw’s stuff.

Or, don’t. The result would be terrifying. And besides, there’s not yet any indication this is going to keep up. For the time being, all we know is that Clayton Kershaw tried an experiment two times in a low-leverage inning. Maybe that’s all we’ll ever see. Or maybe, you know, it’s not. What am I, God?

Update

As shown in the comments, Kershaw was indeed inspired by Hill. And it turns out the strikeout pitch to Parra was the fastest pitch Kershaw has thrown in 2016, by a few tenths of a point. So.