Sometimes you just have to ask. Different systems have different answers for the pitching mix that Jose Fernandez brings to the mound each game. So I did ask him. I said, “Do you consider your breaking ball a slider or a curve?” And the Marlins’ righty said, “I got both. I can throw both. I trust them both equally.” It was a group scrum, not the time for a real in-depth thing, but just knowing there are two there can set us on a path.

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Maybe it was the fact that she spent her formative years in Germany, while I spent most of mine in Jamaica and America’s South, but my mother and I have always disagreed about a fundamental thing when it comes to the weather. For her, she wants the sun. It doesn’t matter if it’s bitter cold and dry; if the sun’s out, she’s fine. I’d rather it was warm. Don’t care if there’s a drizzle or humidity or whatever.

It turns out, when we were disagreeing about these things, we were really talking about pitching. Mostly because life is pitching and pitching is life.

But also because the temperature, and the temperature alone, does not tell the story of pitching in the cold. It’ll make sense, just stick with it.

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He’s listed at a generous 5-foot-6, and he’s never hit more than 15 homers, so when you look up and see that Jose Altuve has hit five home runs already this year, you really just want to shrug and sing a song of sample size. But if you’ve been watching for longer, you’ll have noticed that this has been a long time coming, and that under the hood we find reasons to believe that this young man is just growing into his power stroke.

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Zack Greinke goes to the mound today after giving up 13 runs in his last three starts, something he didn’t do at all last year. So we’re all trying to diagnose him. He is, too. We couldn’t figure it out together, really. Sorry to spoil the ending.

The slider is getting hit hard. Of his pitch types, it has the second-worst exit velocity so far this year, and it’s suffered the most from last year to this year.

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If you look at the positional adjustments for Wins Above Replacement on our website, it looks like left and right field are equally valuable, and the second-easiest positions to play on the field. Generally, that seems about right — first base is where you put your slugger, and the corner-outfield spots is where you put your other sluggers.

And yet, if you look for bats that qualified for the batting title (and didn’t play catcher, the most platooned position on the field), you’ll find that there are fewer left fielders than any other position, and significantly so. Only 15 left fielders qualified last year. Even shortstop had 20 guys who reached that threshold. If you look at the Fans Scouting Report, left fielders were better defensively last year (overall and in almost every component) than they had been before in the life of the Report.

It seems that there’s a bit of a difference between left and right field, and in the types of players who are playing those positions. So I thought it made sense to ask the players what the difference actually was. It’s not as easy as putting the better arm in right field because he has a longer throw to third base.

Tim Leiper, Blue Jays first base coach: “The nuances for me… when the ball is hit directly at you, it’s learning how to open up toward the line. If you’re in right field and it’s a right-handed hitter, and he hits it directly at you, he probably stayed inside the ball and it’s going to slice to the line a little bit. Same thing with a left-handed hitter to left field. But I find that left-handed hitters actually have more slice to the ball than right-handed hitters. That’s probably because they’re right-hand dominant. The spin is different. I think the right-handed hitter’s balls have a lot more chance to stay true. I also think some outfielders maybe open up in one direction better than the other.”

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Shane Greene just had a nice start the other day against the Pirates. He didn’t throw a changeup. He didn’t even throw a curve, according to one pitch-type algorithm. It was all fastballs and… well… breaking balls? Greene features a cutter and a slider, but where one begins and the other ends is tough to decide.

Let’s take a look at all of his non-fastballs from Wednesday, graphed by horizontal and vertical movement and velocity. Maybe you can see two pitches, even if one system saw three. Then flip the tab to see all of his breaking balls over his career. Now how many pitches do you see?

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Baseball can be slow to change. We’ve had this idea for decades that certain pitch types have platoon splits, and that you should avoid them in certain situations because of it. Righties, don’t throw sliders to lefties! It’s Baseball 101.

Think of the changeup, too. “Does he have a changeup?” or some variation on the theme is the first question uttered of any prospect on the way up. It’s shorthand for “can he be a starter?” because we think of changeups as weapons against the opposite hand. A righty will need one to get lefties out and turn the lineup over, back to the other righties, who will be dispatched using breaking balls.

As with all conventional wisdom, this notion of handedness and pitch types should be rife for manipulation. Say you could use your changeup effectively against same-handed hitters, for example. You could have a fastball/changeup starter that was equally effective against both hands, despite the history of platoon splits on the pitch.

To the innovators go the spoils. And we’re starting to see some innovators.

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