It’s not that often that relievers like Brad Ziegler come along. Many teams have lefty relievers with low arm slots whose mission is to get lefty hitters out — but few have righty matchup guys, and fewer still have righty matchup guys who can generate ground balls at a rate even approaching Ziegler’s. This is, in large part, why we were thrilled with the extension that the D-backs signed with Ziegler in December.

It’s not that Ziegler is extra valuable just because he’s unique, exactly. Especially on the position player end of things, it doesn’t matter how you produce value (power, average, fielding, etc.), it just matters how much value you produce. In terms of winning baseball games, anyway. And that’s not necessarily an easy concept to grasp. Said our Jeff Wiser about Kevin Towers earlier this season:

Kevin Towers has sought out the label rather than the production when building his team. He wants “sluggers” and “aces” and “veteran arms” rather than players who have shown solid peripherals that backup long lasting, consistent production…it all becomes a series of trade-offs where you give up defense for offense, positional flexibility for production or a quantity of innings for quality of innings.

As Jeff noted, just as with position players, the type of starting pitcher doesn’t really matter; what matters is production. Sure, there are some types of pitcher profiles that are more reliable than others (fly ball pitchers are prone to a lot of fluctuation, for instance), but a starting pitcher enters every game with the same situation: none on, no outs, and nine innings to play.

You see where I’m going with this: relief pitchers are different. They’re different because a team can manipulate the situations in which they’re introduced. Up one run with one out and runners on second and third, you want some kind of strikeout king up there, because most other outs in that situation will score a run. That’s true even if your strikeout reliever is no better than another option overall. In that situation, the guy with the higher strikeout rate is more likely to help the team succeed.

Most teams have strikeout guys. Most teams would prefer more, but there isn’t a massive shortage of relievers with strikeout rates over one per inning. Strikeout guys aren’t extra valuable through being rare, necessarily — they’re valuable, typically, only in relation to how good they are overall.

But Ziegler is not like that. Change the situation to runners on first and third and one out, and Ziegler’s profile might be as valuable as a strikeout man. Change the situation to runners on first and second with one out, and Ziegler is the more likely pitcher to have success. The same goes with just a runner on first, or those same situations with no outs at all. What I’m describing, of course, is double play opportunities.

Ziegler is a Ground Ball Machine Like You Ain’t Never Seen

This season, Ziegler isn’t the top ground baller. Just 10 of 155 qualified relievers have a GB% at 60.0% or above, but Ziegler ranks just third right now (67.7%), behind Brandon League (72.5%) and a crazy Zach Britton (78.0%). Outliers can and do happen, especially as sample sizes get smaller — we can expect some of these rates to come down a bit by the end of the season because they’re so ridiculous. Between 2002 and 2013 only five relievers had a GB% above 70%. Three were Jonny Venters (2011), Cla Meredith (2007), and Jason Grimsley (2004).

The other two are the same man: Brad Ziegler. From a piece on why Ziegler’s extension was so good:

In 2012, Ziegler ranked 1st among relievers with a 75.5% GB%.  Second place was 67.3%.  Only 9 of 136 pitchers were above 60%.  The median was 45.7% (actually, the median was J.J. Putz — but his best skills are other things).  No one came close to Ziegler.

In 2013, Ziegler ranked 1st among relievers with a 70.4% GB%.  Second place was 68.4%.  Only 7 of 135 pitchers were above 60%.  The median was 44.1%.  No one came close to Ziegler.

For what it’s worth, the GB% leaders for those years among qualified starters were Justin Masterson (58.0%, 2013) and Trevor Cahill (61.2%, 2012).  Not even close to Ziegler, and it’s not even a sample size issue (there’s more potential for variance with smaller samples) — Ziegler has pitched 393.2 innings, and he’s got a 66.1% GB% for his career…Even among great groundballers, Ziegler stands alone — I think we all remember the GB prowess of Chad Bradford, but for the portion of his career for which FanGraphs has GB%, Bradford’s career percentage was 63.7%.  He topped out at 66.5% in 2008.

Ziegler is a unicorn, with only legends of other unicorns in existence. And consider this: of the top fifteen relievers by GB% this year, only one other pitcher (#10, J.P. Howell) has a K/9 over 7.08. Ziegler’s is 8.01 — that’s really quite good.

Ziegler’s Greatness Isn’t Luck

At first glance, it might look like Ziegler has been lucky this year. League average for batting average on balls in play is .298 so far this season. But against Ziegler, hitters have had a significantly lower .242 BABIP.

But that’s not luck. Why? Because so many of Ziegler’s batted balls are ground balls, which fall in for hits a lot less than line drives. Ziegler’s line drive rate is tied for 10th-best in the majors, and that takes away a lot of batted balls that become hits approximately 70% of the time. A big reason? Ziegler never pitches in the top half of the zone. No, really, I mean never. From ESPN Stats & Info:

strike-zone (24)

In addition, Ziegler has the 6th-lowest fly ball percentage in the group of 155. His fly balls have turned into home runs at about a league average rate, but that really doesn’t matter if you’re not giving up many flies, now does it?

But back to ground balls, which typically fall in for hits about 20% of the time. Yes, Ziegler has a lower than average BABIP because so many of his batted balls are on the ground. But not all ground balls, even, are equal; against Ziegler, you put the bat on top of the ball more often. And that also means that fewer of your ground balls are the type of hit that could shoot through the hole if it finds the hole; more of your ground balls will be that kind that makes it look like the batter is trying to kill a groundhog that lives just in front of home plate.

Ziegler ranks near the top of the league  (11th) in “soft hit average” among relievers with at least 40 IP. Courtesy of ESPN Stats & Info, here’s how Ziegler has stacked up in that stat the last three years (other seasons, min 60 IP):


Yeah, that’s right: Ziegler has been the best reliever in the last three seasons at inducing weakly-hit balls. Ziegler is an excellent reliever, who, by the way, happens have this one skill that extremely few other men have. But just how valuable is that ground ball skill?

Extra Value from Ground Balls

Ziegler doesn’t always come on with men on first. But when he does, he prefers dos equis on the scorecard. The man kills in twos, is what I’m saying.

Last season, Ziegler was relied on to be the closer for a few months; for that reason, he wasn’t inserted mid-inning quite as often as he’s normally been, and consequently he had fewer chances to record a double play. In 2013, Ziegler saw 58 “DP opportunities,” as I defined it in this Beyond the Box Score post. He recorded 8 (13.79%). In 2012, Ziegler had 70 “DP opportunities,” and he recorded 20 (29.58%). That’s ridiculous. In 2012, he recorded DPs in DP situations more at a higher rate than the best strikeout pitchers got strikeouts. If you don’t think that has a lot of value, you’re kidding yourself.

That same Beyond the Box Score post was my opus on how elite GB% relievers like Ziegler may have extra value, and if you’re into that kind of thing, I’d recommend a look — John Choiniere collected amazing research for that point. But here’s the punch line:

If elite GB% RPs have a chance of converting a DP opportunity that’s about 7% higher than league average, then over 60 opportunities, we’d expect to tally about 4 additional DPs. Our DPs have not been GB-specific (lineouts do happen), but since we’re talking about GB relievers, I’d be most comfortable assigning a -0.85 run value to those 4 DPs. That’s 3.4 runs — good for about 0.3 wins. If a freak like Brad Ziegler or Seth Maness could demonstrate a real ability to convert DPs at a level above the 20% mark — let’s say, 25% — that could make a real difference, but only up to about 0.5 wins.

A half win — just from double plays. That says nothing about how Ziegler is an excellent reliever anyway, how his pitching profile means that he’s much less prone to fluctuation, etc. And it doesn’t tell the whole story about how especially effective Ziegler is at preventing inherited runners from scoring.

Most pitching statistics (like ERA) pretend that inherited runners have nothing to do with the relief pitcher who takes over. And most of the rest (like FIP) ignore runners completely. But there is one catch-all statistic that’s just amazingly perfect for evaluating special kinds of relievers: RE24. Because on average more runs are scored when the bases are loaded and no outs than when the bases are empty with no outs, RE24 doesn’t just give credit for three outs in both situations; it credits the pitcher with the change in run expectancy (RE, get it?).

In the last three calendar years, Ziegler has an RE24 of 46.02. That means he’s saved 46 more runs than the average pitcher would if an average pitcher had been placed in exactly the same spots as Ziegler. That’s fifth in the majors in that time frame, after just Koji Uehara, Craig Kimbrel, Greg Holland, and Joaquin Benoit. Ziegler is that good. Ziegler is special, even more special than his current 2.42 ERA would indicate.

And that brings us back to the very first point: there aren’t many guys exactly like Ziegler. If you had two Zieglers, you could cover more DP opportunities in the late innings; one Ziegler won’t be available for all of them. But not twice as many. And three Zieglers? Definitely not three times as many. Like a lefty-on-lefty reliever, having a Ziegler means having a different kind of tool on the tool belt, and most teams don’t have one. Every team could use one.

Trading Ziegler

In our Midseason Plan, we recommended the team not trade Ziegler. That was mostly based on the premise that retooling for 2015 was the way to go, instead of tearing down and rebuilding for 2017 or something like that. But it was also premised on the idea that there’s almost no way the D-backs could get good value for Ziegler:

Ziegler should also not get moved unless the team gets a significant offer commensurate with his greater-than-it-appears value, and we recommend keeping him because such an offer is unlikely. In addition, Ziegler’s contract situation is something of a work of art crafted by the D-backs front office, and given his advanced age and connection to the organization, it’s highly likely that the D-backs will be able to extend Ziegler on a short-term deal after they exercise his extremely reasonable option for the 2016 season, should they wish to do so.

The point about Ziegler’s age shouldn’t be missed when considering trades. This October, Ziegler will turn 35 years old. His $5M salary pays for his age-35 season, and the club’s option for his age-36 season is $5.5M. Assuming his performance stays more or less the same for the next two years, will anyone really give him a three-year deal that would take Ziegler up to his 40th birthday? I don’t think so. It seems fairly likely that the D-backs could renegotiate an extra year at the end of the 2015 season for 2017, and even if they have to pay him $6M or so in salary, that market rate salary would be for a shorter-than-market-rate duration. Signing pitchers a year or two at a time makes getting a good return more likely.

I hope the information above helps convince you that Ziegler has a lot of value. But the point really is: he has more value than other relievers with similar ERAs or FIPs, even though he costs the same amount as those other pitchers. That means that his extra value is all surplus value for the D-backs.

It sounds like the D-backs organization might be on the same page, even if it’s because they’re maybe a bit more confident in a 2015 turnaround than they should be. Last Friday, Ken Rosenthal reported a list of six D-backs players that were “untouchables,” and he included a second sentence in the tweet: “And probably Ziegler.” That’s just fine with me. Apparently, “Ziegler” originally meant “bricklayer.” And if the D-backs are going to make a run for the playoffs anytime soon, Ziegler should be part of the team’s foundation.


9 Responses to Ziegler’s Extremely High Value, and Why He Shouldn’t Be Traded

  1. Jeff Wiser says:

    How has no one commented on this? Epic post, brother. Very, very good! #VivaLaZiegler

  2. Paulnh says:

    Sorry I haven’t replied to this post (and others) earlier, I’ve been cut off from the internet world for a week. It’s been miserable.

    I totally agree with this article in the fact that Brad Ziegler is a tremendous relief pitcher. In my opinion, ground balls are underrated. Double plays kill innings and when you keep the ball on the ground you keep the double play ball in order. Brad Ziegler is most definitely in a league of his own in this aspect. He makes hitters pound the ball into the dirt so often it really is incredible. One thing that I have noticed in watching him, is that he gets so many weak, 4 hoppers to the shortstop that they can’t turn a double play and the article mentioned thae fact of his small hard hit average. I’m probably biased in saying this, but I really think that Brad Zielger is the most valuable relief pitcher in all of baseball if he is used to the best of his abilities. Yes he gets grounders at an amazing rate, but he also strikes out hitters, too. That is one aspect of his game that has really gone unnoticed for the most part. His little frisbee slider with two strikes is downright unhittable and can be a real weapon when he needs a punch out.

    His age does not bother me at all either. If he loses velocity, it won’t impact the way he pitches. I would be comfortable signing him until he was 40 because his deception and ground balls will always be there. I think Brad Ziegler is the kind of guy who is going to retire on his terms not when he can’t find a job. He will always have a spot on a major league roster.

    Having said all of those praises about Brad Ziegler I’m sure you’ll find it hard to believe the fact that I agree with you that we should not move him. But…I still think that if a team comes crawling to us begging for a relief pitcher, we should definitely see what they will offer. I am of the belief that a GM should NEVER say a player is off limits, even if that player is Paul Goldschmidt. You never know when someone will offer you Doug Fister for Steve Lombardozzi. I was furious when I heard that tweet by Ken Rosenthal about the players that were off limits. Why not shop them and see what you can get? You don’t have to trade them. I doesn’t hurt anything. I was especially annoyed in hearing that we wouldn’t trade Chris Owings. I’m not sure that his stock wasn’t as high as it would ever be before his injury. I’m not sold on him just yet and I still believe Didi Gregorious can be a solid major league shortstop. Out of my rage in hearing that news, I came up with a trade that I think is fair, somewhat realistic, and would spite Kevin Towers. Baltimore is in a playoff race, gets literally no production from second base, and is not looking to throw away the future. Chris Owings could fit in with them nicely. If we are going to give away Chris Owings, we would need a nice return and I think Archie Bradley’s high school friend, Dylan Bundy, would be a good trade. He had Tommy John and I believe will be out until near the end of the season. The O’s want to win now, so Bundy is expendable from that point of view. I would love to hear what you guys think of my trade.

    • nazdbacksnut says:

      I would do that trade in a second with the infield depth the team has but I don’t think the O’s would ever even consider that trade.

  3. Brad says:

    Nice post!
    Ziegler is one of my favorite player since I became a DBacks fans, his ability to generate ground balls and DP, not allowing runner left on the bases score, and very healthy in those years, so I am very happy when I read the story that Dbacks were unwilling to trade Ziegler to the Tigers.
    Also I hope DBacks not trading Perez, the team have been looking for a reliable left-handed reliever for a long time, last year we got Reynolds but he went through TJ surgery, and we got Thatcher but he had a bad second-half and being traded to the Angels before AS game. Perez’s salary is pretty reasonable if he can continue performing like this, but if we can bring young arm back by trading Perez, it’s ok because I think the Dbacks will need 2-3 years to rebuild.
    As for the Owings deal, I prefer moving Hill or Prado first, Prado might bring better package back and we will be alright since there are young 3B prospect almost ready for major league. And I think Didi has major league level defense ability so it’s fine trading Owings if we can get reasonable value, especially good young pitcher(no more young infielder for reliever again…)
    By the way, I am a DBacks fans from Taiwan, if you guys never heard of this country, Chen of the Orioles, former Yankees SP Wang,former Dodgers pitcher Kuo are all form this small country in Asia.
    Please forgive me for my poor English and thanks for reading my comment.

  4. […] than meets the eye. With regard to both, that’s kind of a pet issue for me: Ziegler because traditional stats don’t capture the potential value of deploying him in double play opportunit…, and Prado because WAR and other stats don’t account for the considerable extra value he […]

  5. […] covered Brad Ziegler a time or two here at Inside the ‘Zona in the past as we’ve seen him as a rare type of baseball asset […]

  6. […] no chance for a fielding error, etc. But Brad Ziegler does what he’s supposed to, and with the double plays he’s able to generate with the grounders he produces, well, he gets “extra” batters out at rate far above average. […]

  7. […] hits than expected; if you have a ground ball rate like Brad Ziegler, the ground balls themselves tend to be easier to turn into outs than the average ground ball. On the flip side, there’s an even more exclusive club of pitchers […]

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