The other day, in one of my chats, someone asked if I could design a dream starting pitcher, throwing any four pitches of my choosing. Of the pitches, I wanted a curveball, and of all the curveballs, I settled on Adam Wainwright‘s. There are a host of excellent curveballs out there — Clayton Kershaw‘s is famous, and Jose Fernandez’s will be — but Wainwright’s is spectacular, and I was also dealing with recency bias after Wainwright’s start against the Pirates in which his curve flat-out dominated. That curve was fresh in my mind, and the worst thing about Wainwright’s game ending was that I wouldn’t be able to watch that curveball anymore.

A funny thing happened on an earlier tour through the Baseball Prospectus PITCHf/x leaderboards. I was looking at 2013 starting pitchers, and I was looking at curveballs, and almost by accident, I noticed that Wainwright’s curve generated a good whiff rate, but Gerrit Cole’s generated an excellent whiff rate. Cole — Wainwright’s opponent in just a couple hours in Game 5 of that series. This was originally slated to be a matchup between two great curves. Now it looks like a matchup between one of those great curves, and another, also great curve. There are a few things we can take away from this.

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A week ago, Clint Hurdle chose A.J. Burnett over Gerrit Cole to start Game 1 of the NLDS. This was a perfectly reasonable choice, as Burnett has been excellent for the Pirates this year, and is a 37 year old veteran, while Cole is a 23 year old rookie who had just over 100 innings in his big league career. Cole has been very good since the Pirates called him up, but by pretty much any measure, Burnett had been as good or better, and he’s got a longer track record of pitching at this level.

Burnett, of course, imploded. He allowed as many hits (6) as he got outs, and he walked four batters as well, including the opposing pitcher. Seven runs scored and the Cardinals rolled to an easy victory. The next day, Cole shut down the very same line-up, allowing just two hits and one run over six innings, allowing the Pirates to tie the series. And now, with both Burnett and Cole on full rest for Game 5, Hurdle is going with the kid.

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Despite being up 2-1 in the NLDS, today is a pretty important game for the Pirates. A loss not only means that the series goes to a deciding game 5, but that game 5 would be in St. Louis, and the Cardinals would put Adam Wainwright back on the hill for that deciding game. Beating Wainwright at home is no easy task, and they can’t feel very good about that match-up given how poorly the first game of this series went for the Pirates.

So, it’s not an elimination game for Pittsburgh, but this is the one they want to win. Beating Michael Wacha in Pittsburgh is a much easier task than beating Wainwright in St. Louis. To win this game, though, they’re going to need a strong performance from Charlie Morton, or at least, several innings that keep the score close before the battle of the bullpens takes over. If you look at Morton’s season line — 116 innings, 3.26 ERA/3.60 FIP/3.69 xFIP — that doesn’t seem like it should be too much to ask. But Morton, as a pitcher, has one very big flaw that might be a problem against St. Louis today.

Morton throws fastballs about 70% of the time, and most of his fastballs are of the two-seam variety. It’s why he posted a 62% GB% this year, and it’s why he absolutely destroys right-handed batters. He throws a heavy, pounding sinker that just eats RHBs for breakfast, but the same strengths that allow him do dominate righties create serious problems against left-handers.

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One of the things about advanced metrics is that they can tell you things you might not have guessed. The other day, for example, I wrote about a showdown between Alex Cobb and Danny Salazar, and by some of the numbers, that looked like one hell of a potential duel. Thursday, A.J. Burnett and Adam Wainwright also looked like one hell of a potential duel. Wainwright, people know about — he’d be another year’s Cy Young winner. Burnett, though, was more quietly outstanding, after being dismissed by New York. Wainwright finished with the National League’s third-best FIP. Burnett finished fifth, just in front of Cliff Lee and two of his teammates. On that basis you could argue Burnett is the Pirates’ best starter.

One of the things about A.J. Burnett is that, who knows? We’ve never really had a great measure of starting pitcher inconsistency, but if we did, Burnett would probably be at or near the top of the list. Inconsistency has long been his reputation, and so long as the potential is there for a meltdown, it can never mentally be counted out. And Thursday, Burnett melted down. In what could’ve been a compelling showdown of aces, Wainwright was ahead seven runs before he threw a pitch in the fourth. When the Pirates pulled within six, the Cardinals extended the deficit right back. Both starting pitchers showed up, but only Wainwright did more than that.

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It is time to look at the third team on the field for the National League division round, the umpires. Each umpire is given a quick look to see if they have any unique strike calling patterns. Also, I posted their 2013 K/9 and BB/9 rates which I scaled them to the league average strikeout and walk rates. A 100 value is league average and a 110 value would be a value 10% higher than the average. Additionally, I added images of their called strike zones verses right and left handed hitters (from catchers perspective) compared to the league average. The scale is the percentage difference where -0.1 means 10% points less than the league average

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One of the oldest cliches in baseball is that pitchers have to establish their fastball. The average Major League pitcher throws their fastball about 60% of the time, and any deviation from that can get you labeled a junkballer.

Francisco Liriano, with the Pirates season on the line, told that cliche to go pound sand.

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This evening, the Reds and Pirates will square off in the NL Wild Card game, with the winner advancing to play the Cardinals starting on Thursday. Last week, I wrote up my suggestions for how Clint Hurdle should handle his pitching staff, utilizing an army of relievers to keep the Reds left-handed bats at bay. However, the Pirates are not the only team that can and should go match-up crazy today, as Pittsburgh’s line-up essentially invites Dusty Baker to play the same kind of game.

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Here is a quick look at the called strike zone and strikeout and walk rates for the three home plate umpires over the next three nights.

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The Pirates have done us the favor of getting better gradually. Four years ago, they were absolutely dreadful. The next year, they were fine through July. The next year, they were fine through August. Now they’ve been good through September. We’ve been able to see the Pirates coming, to some extent, and so this 2013 success hasn’t taken us by complete surprise. We were prepared for this, and we can make sense of this, and we’re not fighting whiplash as a consequence of watching the Pirates blow by. The Pirates are evidence that a good plan takes time, and that time can bear fruit.

But it’s still weird seeing the Pirates in the neighborhood of baseball’s best record. They’re still, technically, in contention for the National League Central entering the last weekend, and they’re in line to play at home in next week’s one-game NL wild-card playoff. And you notice something, in the standings: the Cardinals have a +172 run differential. The Reds are at +119. The Pirates are at +47. We know that run differential isn’t everything, and we’ve been over this so many times, but it’s still worth quickly examining one thing the Pirates have been doing in particular to allow them to amass all these wins. In one category, the Pirates have been blowing baseball away.

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Home-field advantage is a strange concept, or should I say, a strange reality. It doesn’t really matter, for our purposes, why it exists — it just matters that it exists. It’s there, all of the time, in every single baseball game, and while I wouldn’t say it’s an unspoken thing, it’s seldom thought of in depth. A team playing at home has an advantage it wouldn’t have in a neutral site. A team playing on the road is at a corresponding disadvantage. We accept that it is, and we don’t talk much about it, and when we talk about potential edges, it’s usually ignored in favor of pointing at match-ups. It’s almost too boring to point out Team X stands better odds because they’re playing in their ballpark. Someone’s always playing at their ballpark.

But home-field advantage is exactly what the Reds and Pirates have to play for this weekend. Very fleeting home-field advantage — home-field advantage in the one-game wild-card playoff between the two rivals. The teams will play three before they play one, and the Pirates are 50-31 at home, while the Reds are 49-28. Each would prefer to play before its own partisan audience. It’s obvious that it matters who gets to play at home. But how much does it matter? What’s a way that we can think about this?

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