When Kiley McDaniel wrote about the Athletics prospects before the 2015 season, Ryon Healy was just a “name to note” with “55 raw power that plays down in games.” After Healy produced a nice year at Double-A — albeit one without much power — Dan Farnsworth didn’t add much love, saying that he didn’t think Healy had the “swing path to keep driving balls.”

They weren’t alone. Baseball America made him Oakland’s 22nd- and 23rd-best prospect those two years, respectively. He didn’t make it into either of the team write-ups on Baseball Prospectus. Keith Law didn’t include him in his Oakland write-up going into this season.

Healy is 24, yes. He’s only had 184 plate appearances, sure. But he’s already shown more power than projections and prognosticators had in mind for him, and it’s probably not a fluke. He’s made a change we’ve heard about from many other major leaguers. He’s not using the same swing path that kept him off the top-prospect lists.

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A friend was asking a question about matchups in the coming month, and was talking about lefties and how Houston has done against lefties and maybe he should start A.J. Griffin against them and so on. I was playing along, pointing out that maybe it wasn’t a great matchup because Houston has a good lineup and they’re in a park that’s good for offense and all that. I didn’t even blink.

Of course, Griffin is a righty. No idea why we both thought he was a lefty, but we’re not alone. A quick Twitter poll — results below! — revealed Griffin as a top contender for “righty we most think is a lefty.”

Unfortunately, none of us know why we mentally mistake hands on some players. Or at least, we don’t have a quick answer to that question, other than vague references to arsenal (“crafty”), temperament (“different personalities”), or television time (“I don’t see them much”). Most responses to the poll included an “I don’t know why” of some sort.

Still, it’s something we do. And it’s sort of fascinating, because lefty starters do actually do things a little differently than righty starters — things we can actually define objectively. Which means we can apply the statistical definition of a lefty starter to the righty-starter population. And we can answer this question with stats!

So… which righty really acts the most like a lefty? Which righty is the most lefty-like? Turns out, it’s not Griffin, but the wisdom of the crowd was not far off, really.

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I hadn’t planned on talking to Zack Greinke about the game he’d started the night before, but then, for the second time in his career and the first time since his rookie year, he went six innings and recorded only one strikeout. It was a win for the team, but maybe not his finest game, that one against the Giants on Tuesday night. So I had to say something. “They make a lot of contact,” he grumbled, “but it wasn’t ideal.”

When I asked him if anything was different, he shrugged. “Against guys like Denard Span, Ben Revere, Buster Posey, I’m not going to spend a lot of pitches going for the strikeout. They make too much contact.”

We’ve heard this sort of thing before, of course. Pitching to contact is even espoused as a general philosophy by some organizations. But it’s a little surprising to hear from this pitcher, who regularly strikes out 200 batters a year, even if he’s told us before that pitching to FIP — pitching to limit the walks and increase the strikeouts — just led to hard contact in the zone.

He also gave us a name! Denard Span, he of the 3.7% career swinging strike rate, good for 11th-best overall since he’s been in the league. Span, because of his contact-oriented skill st, has forced Greinke to approach him differently.

So let’s look at Greinke’s plan against Span this past Tuesday and see what he was trying to do.

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In his last start, the Giants’ Matt Moore did something he’d never done before. Not no-hit a team through eight innings: he’d thrown an actual no-hitter before, in Double-A in 2011, on 98 pitches on his brother’s birthday. He’d thrown a one-hitter before, too — albeit over seven innings instead of 9.2, and earlier in his pro career.

What he did this Aug. 25 against the Dodgers that he’d never done before was throw a cutter 29 times. Only twice had he thrown the pitch even 10 times, but there he was going to the well, again and again, on his way to an oh-no instead of a no-no.

Weirdly, he didn’t get a single whiff on the pitch. But it doesn’t seem like the swinging strike is the point to the pitcher. Nearly everything else is.

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Dansby Swanson is dapper. Dansby Swanson is exciting. Dansby Swanson should have great plate discipline and a good hit tool. And Dansby Swanson is a major leaguer. These things are all true. Dansby Swanson may also be a slugger in the future, but he’s not yet. That’s weird, though, because he’s being pitched like a slugger in two key ways.

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Khris Davis has maintained excellent exit velocity all year, and has 33 home runs to his name, but that doesn’t mean he hasn’t pressed at times with his new team. His walk rate is less than half what it used to be, and his swinging-strike rate is up nearly 20%.

The Oakland outfielder admitted that his decision on when to swing hasn’t been at its finest this year. “I was putting pressure on myself in a new environment,” he told me recently before a game against the Indians. “It was mental. Just kinda settled down.”

It’s something we can easily see in his swing percentages — but, perhaps more importantly, it’s totally normal and has happened very often to other big bats changing teams.

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Imagine you’re floating on a raft down a lazy river. It can’t be so hard to imagine, it’s still August. In one hand, naturally, you’ve got an adult soda; the other, you place into the water to check the temperature. Suddenly, you’re headed — slightly but perceptibly — towards the bank on the same side as that hand you’ve submerged. Now stop imagining.

In layman’s terms, what you’ve done is to use your hand as a rudder of sorts. That’s one way of characterizing the effect. What you could also say, however, is that you’ve disrupted the laminar flow, creating a force that alters the direction of the object within the flow. Those aren’t layman’s terms.

Whatever the precise words you’re using, they’re all relevant to a baseball flying through the air. The seams cause drag in different ways, and that drag causes movement. Physicist Alan Nathan does a better job explaining it both here and elsewhere, but that’s a simple way to understand the relationship of the seams to movement.

Trevor Bauer is currently showing the best horizontal movement on his sinker of his career. That’s what this graph illustrates:

When I asked him about it, he agreed that it was good earlier in the year. Not recently, though. “Recently, it’s been shit,” he told me Tuesday afternoon. And you can see that, yes, indeed, the horizontal movement has been more erratic than it was earlier in the year.

Part of that is just the fact that the body changes slightly over time. It’s related to the difficulty in improving command. Little muscles act differently as they get more or less fatigued than the muscles around them. “I also overhauled my delivery a couple of years ago, and I’m starting to get better muscle memory for this new delivery over time,” Bauer pointed out. So that’s helped him get to this point where he’s commanding the ball better, which has allowed him to throw the front-door sinker to lefties more often this year, a big part in putting up his best strikeout- and walk-rate differential this year (and overall numbers) against lefties of his career.

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