Rick Porcello has changed his pitching mix this year. Most noticeably, he’s ditched his cutter for a curveball. The move was done for a variety of reasons, but the work continues to this day. Because even once you make a change, you have to work hard to maintain it.

The Tiger starter told me that he “really dedicated” himself to working on his curve this offseason, mostly because the cutter/slider “wasn’t really working.” Since it moves left to right, it cuts right into the meat of the plate for lefties. “The curveball is a more effective pitch to left-handers, which is something I struggle with,” Porcello admitted to me before his team played the White Sox in Chicago this week. Over his career, the pitcher has allowed lefties lower strikeout and grounder rates and higher walk rates than he has allowed to righties.

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The last time I wrote about Edge% it was in the context of the Tampa Bay Rays using it to get their pitchers into more favorable counts on 1-1. But now I want to take that topic and drill a little deeper to understand how often edge pitches are taken for called strikes.

Overall, pitches taken on the edge are called strikes 69% of the time. But that aggregate measure hides some pretty substantial differences. Going further on that idea, I wanted to see how the count impacts the likelihood of a pitch on the edge being called a strike.

Here are the results:

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Some years ago, when they were up-and-coming instead of bad, Yuniesky Betancourt and Jose Lopez were both Seattle Mariners. The Mariners are well known for their advertising campaigns, and in one they pitched Betancourt and Lopez as the “double play twins,” middle infielders who did everything together, both on and off the field. Betancourt and Lopez, at the time, had a lot in common. Today, they continue to have a lot in common, which is too bad. But they were teammates, and they were sold as a pair.

A much better pair of teammates today includes Miguel Cabrera and Prince Fielder. The two are commonly discussed as a duo, as they make up perhaps baseball’s most intimidating lineup core. Cabrera and Fielder are supposed to do some things together, like crush baseballs. In the third inning on Saturday, for example, they slugged back-to-back dingers. What they’re not supposed to do together is steal. Cabrera and Fielder, combined, have fewer career steals than John Kruk. But, Sunday afternoon, the two pulled off a most unlikely double steal, and this demands to be investigated.

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Justin Verlander was excellent yesterday against Toronto, throwing seven shutout innings en route to the Tigers’ 11-1 demolition of the Blue Jays. He was not quite as dominant as the Verlander of 2011 and 2012, but that is a pretty high standard. Actually, the 2013 Verlander has not really measured up to that standard all year. Verlander won both the Cy Young Award winner and Most Valuable Player in the American League in 2011, then was just as good in 2012. He pitched a cumulative total of 489 and a third innings and had a 2.52 ERA during those seasons.

By reasonable standards, Verlander’s 3.54 ERA and 112 innings pitched at the halfway point of the 2013 season is very good. By his own recent standards (as well as that being set by his 2013 rotation mates Max Scherzer and Anibal Sanchez), it is somewhat disappointing. It is not that Verlander’s 2013 is bad in itself, and it is hardly the Tigers’ main main problem — that would be the bullpen (solution: move Verlander to the ‘pen!). Still, Verlander’s apparent decline might concern some people. My intention is not so much to evaluate Verlander’s current true talent or possible health problems, but to put his recent performance in historical perspective relative to pitchers with similar stretches of success.

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Last year, we were pro-Mike Trout. The AL MVP debate pitted the Triple Crown against overall performance, and we came down on the side of evaluating players by things other than batting average, home runs, and runs batted in. Unfortunately, being pro-Mike Trout meant that we were perceived to be inherently anti-Miguel Cabrera. It’s not that we had anything against Cabrera, but he became the personification of The Other Side. In order to help explain why Trout was better, we had to point out where Cabrera was deficient relative to the guy we supported. It’s the nature of comparisons, but it’s not always fair to the guys being compared, especially when picking between multiple great players while trying to decide which one happened to be the greatest.

This post is not a comparison. This post is just about Miguel Cabrera, and appreciating how good he actually is, because as a follow-up to his Triple Crown season, Cabrera’s 2013 season is shaping up to be his best season yet, and one of the best offensive seasons in baseball history.

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You know who sucks at hitting? Pitchers. Boy, they just really suck. Pretty much always have, probably always will. Sure, every so often, a random pitcher will run into one and blast a dinger out of nowhere. But the same could be said of Munenori Kawasaki (now), and while pitchers aren’t automatic outs, they’re as close as you’re going to get to automatic outs in a regular major-league baseball game. Maybe this calls for a reminder that pitchers only suck relative to big-league position players. They’re better at hitting than us. But their numbers are always deplorable, and we don’t always have to be all fair-like. When a pitcher bats in a rally, you assume that the rally is over.

The designated hitter became a thing in 1973, following various proposals. From that point on, pitchers stopped hitting in the American League, while they continued hitting in the National League. In the previous sentence I have explained the most basic of rules. Thus, NL pitchers faced a lot of pitchers, while AL pitchers didn’t, even after the advent of interleague play. Unsurprisingly, then, since the DH came into existence, NL pitchers have posted a higher strikeout rate than AL pitchers. They’ve posted a higher strikeout rate every single season.

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The Tigers bullpen has been a running punchline for a while now, and if you were to identify a flaw on their team — besides corner infield defense, anyway — you’d point out their shaky ninth inning options when being asked to hold a lead. Bruce Rondon showed he wasn’t ready for the gig, then Jose Valverde tried and failed once more, so now it’s Joaquin Benoit’s chance to hold down the closer role.

However, the modern singular focus on the closer as representative of a team’s bullpen strength can be misleading, and Detroit is a prime example of why the guy getting the save doesn’t have to be your best relief pitcher. The Tigers might not have a closer, but in Drew Smyly, they have something even better: an old school relief ace.

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In his Major League debut for the Mets, 23-year-old Zack Wheeler struck out seven hitters in his six innings of work. Of those seven strikeouts, six came on fastballs — and of those six, four came on whiffs induced by fastballs.

This got me wondering, what pitchers this year have generated the largest percentage of their strikeouts off of their fastball? And how many generated those strike outs on swings and misses on fastballs*?

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Last year I reintroduced VOL, a custom metric that attempts to measure the relative volatility of a hitter’s day to day performance. It is far from a perfect metric, but at the moment it’s what we have.

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Part of this is the easy part. The Tigers are good and the Astros are bad, and that much you knew. That much you’ve known for weeks, or months, or years I guess depending on things. The Tigers lost on Wednesday, but they lost because of Jose Valverde and James Shields, and they still have a comfortable lead in the American League Central. I’m writing this before there’s a Wednesday Astros result, but by the time you read this they probably will have lost, because they’re bad. Maybe I’m going to come away looking like an idiot, but win or lose, they’ll be in the AL West basement. The Astros were supposed to be terrible, and they’re ahead only of the Marlins, who’ve recently received a healthy new Giancarlo Stanton.

Now, the Tigers don’t have the best record in baseball. That belongs to the Cardinals, and the Tigers are a good distance behind. They’re also behind a bunch of other teams, and tied with the Orioles. Meanwhile, while the Astros have been dreadful, they do have a better record than those Marlins, and they’re theoretically within striking distance of the Cubs. Neither of these teams looks to be extreme. But by one important metric, the Tigers are on pace to be one of the best teams in a very long time. And the Astros are threatening to be one of the worst.

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