It’s still March and the season has yet to start but that doesn’t mean the closer carousel isn’t in full swing. From here on out, as teams whittle down their major league rosters and we get more information on bullpen usage, we will be updating the BR regularly.

• Red Sox closer Koji Uehara has been on the shelf with a hamstring injury lately and it acted up again in a bullpen session Monday. While Uehara’s injury isn’t major, he’s still 39 years old without a clean medical bill. Uehara won’t be out for too long but it’s important to note Uehara said “I don’t know when I’ll be back […] It’s a day-to-day process. I have to do what I have to do to get ready.”  In Uehara’s place, expect Edward Mujica to take over the ninth with a little Junichi Tazawa thrown in. Mujica should now be owned in all leagues, even shallow ones. He can’t be relied upon for particularly strong ratio help or strikeouts, but saves are saves and Mujica will be tallying them in the first month of the season.

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With the news that Kenley Jansen is going to be sidelined into May after undergoing surgery on his landing foot, the Dodgers are going to need to find someone to close games for them in his stead. Over the past five seasons, Andrew Friedman has cobbled together bullpens in Tampa that ranked 11th in WAR in the majors. Not stellar, but definitely better than the 24th place the Dodgers have ranked over that same span. Has he given Don Mattingly the right mix to fill the hole left by Jansen, or is he going to go out and add a Rafael Soriano through free agency, or will he reach out to the Phillies and try to make a deal for Jonathan Papelbon?

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Two weeks ago, I wrote about the importance of evaluating expected strikeout rate (xK%) in the context of each pitcher’s respective histories. In other words, xK% on its own can only tell you so much about a pitcher’s chance and magnitude of regression toward the mean.

And last week, I refined the expected walk rate (xBB%) metric for pitchers by adding a proxy for pitch sequencing in the form of percentage of counts that reach 3-0 (“3-0%”). This helped better explain the model’s fit with respect to the data, as pitchers who worked into more 3-0 counts tended to walk more batters. (Who knew?)

The logical next step is to combine the two aforementioned analyses: 1) comparing xBB% to BB% 2) for each pitcher over time. I’ll reiterate a couple of key points. Calculating a pitcher’s xBB% can give us a decent idea of how lucky or unlucky he may have been during a given season. Calculating his xBB% and comparing it to his actual BB% on an annual basis can give us a better idea of truly how he typically performs against his xBB% — that is, if he consistently outperforms his xBB%, perhaps the difference between his xBB% and BB% is not a matter of luck at all but a skill or characteristic not captured by the variables specified in the xBB% equation.
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This post continues our Depth Chart Discussions. In an effort to suss out every team, we’ve divided them into four parts (infield, outfield, rotation, and bullpen) and will continue to break them down for you over the next few weeks. You can find the Depth Chart Discussion posts gathered here.

The San Diego Padres’ bullpen lacks name brand appeal, but it’s glorious. Friars’ relievers ranked just 14th in WAR (3.4), but boasted exceptional ranks in other categories ranking tied for third in SIERA (3.07), third in WHIP (1.14), and second in K-BB% (16.4%) and FIP (3.09). Those numbers are partly inflated by the brilliant 33 innings thrown by former closer Huston Street, who was dealt in July, but even in his absence this is a fantastic group. Read the rest of this entry »

I expected to follow up my xK% differential post from last week with a complementary xBB% differential post. For those who don’t enjoy surprises, I’ll let you know now that that didn’t happen. In its stead, I bring what I hope is good news — news that will not only influence a future xBB% differential post but also may impact general pitcher analysis henceforth and possibly international diplomacy.

The title of this post, however, is a tad misleading. I think I can say, with some degree of certainty — and I hope to demonstrate, with some degree of competency — that pitch sequencing indeed plays a role in a pitcher’s walk rate, as the devilishly handsome Mike Podhorzer has postulated. What I can’t describe, with any degree of certainty, is the magnitude of the role it plays. In truth, I desperately want to prove Mike wrong: there must be other factors, outside of pitch sequencing (and pitch framing, perhaps), that help explain a pitcher’s walk rate. For example, I have tried incorporating O-Swing% and Zone%, two PITCHf/x metrics provided by FanGraphs that I swore would fill in the cracks, but they offer little in the way of additional explanatory power.

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The Atlanta Braves can say they have one dominant bullpen arm in Craig Kimbrel. Beyond that, and this year’s squad is a bit more iffy. Last season the Braves pen was middle of the road with a combined 3.8 WAR, but when accounting for their second lowest in baseball mark of just 440.2 innings pitched, the ratio shows how well the staff pitched. Looking to this season, the fantasy options are more limited with the departures of David Carpenter, Jordan Walden and Anthony Varvaro, last year’s top three holds leaders in Atlanta. After Kimbrel the value drops off considerably, but there are other mildly interesting options to be had.

Closer
Craig Kimbrel

Setup
Jason Grilli
Jim Johnson

In the Mix
Josh Outman
James Russell
Luis Avilan
Jose Veras

Also Rans
Juan Jaime
Arodys Vizcaino

Closer
It’s hard to overstate just how good Craig Kimbrel has been for his career. His ups-and-downs have consisted of a seasonal worst 2.48 FIP in his rookie season where he threw all of 20.2 innings. Sure, Kimbrel was a bit fortunate with a .235 BABIP and 0.29 HR/9 rate last year, just know that his 1.61 ERA and 1.94 SIERA were no flukes compared to his other seasons. If Kimbrel is your first pitcher — not just reliever — drafted and it happens in the fourth round, you can do just fine. Read the rest of this entry »

It’s time for our Depth Chart Discussions to begin. In an effort to suss out every team, we’ve divided them into four parts (infield, outfield, bullpen, and rotation) and will begin breaking them down for you over the next few weeks. You can find them gathered here.

The Brewers lost half of what was a decent bullpen to free agency (Francisco Rodriguez, Zach Duke, and Tom Gorzelanny) and trades (Marco Estrada) this offseason and would enter the 2015 season pretty thin as currently constituted. That makes Milwaukee a relief corps in flux for fantasy. K-Rod recorded 44 of the team’s 45 saves last season, and Duke earned 1.3 WAR in a dominant campaign that featured 11.4 strikeouts per nine, which placed him in the top 25 of relievers with at least 50 innings pitched last season. Duke is now a White Sox and cannot return, but K-Rod remains unsigned. His return would mute much of the intrigue that centers on a likely new old closer.
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I am huge proponent of the pitch type work which has led to the Arsenal Score here are FanGraphs. One possible issue with pitch type data is a reasonable amount of data needs to be collected before any conclusions could be draw. I am going to take it a step further today and look for MLB ready fastballs knowing just the pitcher’s velocity and break. Just knowing how the pitch’s speed and trajectory, some conclusions can be drawn on how the pitcher will perform in the future.

This past summer, I found how to estimate a pitcher’s fastball ground ball (GB%) and swinging strike rate (SwStr%) knowing just the velocity and break. The ground ball rate was the same for all pitches while the swinging strike rate varied a bit. Well, I went into meld/average mode to come up with a method to find a simple way to determine how productive a fastball may be knowing its current break and speed.

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So many things happened. Everyone was traded. Everyone was released. And everyone was signed. It’ll fuel RotoGraphs pieces for weeks to come. You’ll see more in-depth pieces on these guys. But, with the dust settled, it seems like a good time to run all through some of the players that changed addresses, and talk a little bit about how they may have changed their fantasy outlooks for the coming season.

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Jose Fernandez was having a dominating 2014 season until he needed Tommy John surgery last May. The 22-year-old righty could be one of the more dominant arms in the game when he returns. Fantasy owners would love to have him available mid-season as a boost their team.  While he is on the disabled list (DL), some other pitcher must be filling in for him. Fernandez’s projection should include this replacement pitcher’s production. Here is a break down of how I put on value on players who will miss significant time.

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