There are few things in baseball more amazing than the evolution of bullpens. From not existing when the game began to the reason Kansas City won their title last season, the progress is stunning. Despite the leaps forward, there’s old thinking infesting the concepts of relief pitcher use. Teams cling to the set closer role, creating a rigid structure that lends itself to overuse of a team’s winning pieces. The Texas bullpen is no different.

To talk best about right now, we need to examine how we got here. Let’s turn back time a year to 2015. Manager Jeff Banister names Neftali Feliz his closer out of Spring Training, yet by May Shawn Tolleson was getting the save chances and Feliz was an afterthought (he’d be DFA’d in early July).

Fast forward to 2016. Tolleson walks a mile in Feliz’s shoes, struggling early before being replaced by current closer Sam Dyson. Tolleson isn’t even with the big club anymore after being optioned to Round Rock. There’s even reason to be concerned about Dyson, whose 2016 isn’t as dominant as his 2015.

Teams in general, Texas in specific, are asking the wrong question. They’re asking “Who should my closer be?” when they should be asking “What is the best way to use my relievers in a specific situation?” The save statistic is becoming like the pitcher win; an arbitrary stat that tells us little. The save itself is not important. It’s what the save represents, winning the game, that matters.

So what we’ll do here is lay out a few common situations, and give a rundown of which Rangers reliever should pitch in that situation. Obviously, not every pitcher will be available every day, so I’ll rank them in priority order from best suited to worst suited. For the purpose of this exercise, we don’t care about saves in any way. They will be a byproduct of success, a cherry on top of the winning baseball sundae.

(Note: With all due respect to Tony Barnette and Alex Claudio, I view them more as multiple inning guys who won’t see late inning work consistently unless other pieces aren’t available. So we’ll be focusing on the five main parts).

1. Nobody on, outs regardless(starting an inning most common situation)

Pitcher BA OBP SLG Sam Dyson .242 .308 .358 Jake Diekman .157 .231 .217 Jeremy Jeffress .298 .347 .372 Keone Kela .140 .260 .279 Matt Bush .210 .281 .247

The ideal situation where an inning is fresh, Texas has a lead and needs to keep the other team from scoring. Diekman is the best in this situation, keeping hitters to a .157/.231/.217 line. Kela allows a lower average, .114, but his OBP and SLG are higher. Jeffress grades out as the worst, in this case, posting a .298/.347/.372 slash in these situations. This isn’t the last category where Jeffress performs worse than expected.

2. Pitching with men on base, any outs

Jake Diekman Matt Bush Sam Dyson Jeremy Jeffress Keone Kela

Pitcher BA OBP SLG Sam Dyson .237 .307 .315 Jake Diekman .146 .266 .278 Jeremy Jeffress .234 .300 .330 Keone Kela .263 .316 .667 Matt Bush .242 .266 .410

Once again Diekman takes home the crown for shutting down an in progress rally. A filthy .146/.266/.278 slash for opposing hitters makes him the go-to option. The problem is, past Diekman, the options get worse. Bush is the next best in this situation, but even he’s allowing a .242/.266/.410 line. The one guy that you should feel most uncomfortable in this situation is Kela. He’s bad to the tune of .263/.316/.667.

3. Pitching with runners in scoring position, any outs

Matt Bush Jake Diekman Sam Dyson Jeremy Jeffress Keone Kela

Pitcher BA OBP SLG Sam Dyson .241 .302 .310 Jake Diekman .191 .346 .400 Jeremy Jeffress .208 .302 .326 Keone Kela .429 .500 1.286 Matt Bush .114 .139 .206

A new champion approaches, as Bush slots in as the best option in these scenarios. With a sparkling .114/.139/.206 slash against, he’s lockdown when it comes to this situation. It’s worth nothing that he’s got only 10.1 IP in that situation, but that small sample size is sterling. Diekman, who’s been outstanding so far in this endeavor, has only 5.2 IP in this situation with a .191/.346/.400 line. Dyson and Jeffress are somewhat interchangeable here, and while Kela is a train wreck he also has a tiny sample size (1.1 IP).

4. High leverage situations

Jake Diekman Jeremy Jeffress Matt Bush Sam Dyson Keone Kela

Pitcher BA OBP SLG Sam Dyson .215 .315 .346 Jake Diekman .094 .216 .188 Jeremy Jeffress .164 .259 .181 Keone Kela .200 .333 .400 Matt Bush .179 .233 .321

I’m using Fangraph’s definition of high leverage for this, which they explain here in long form. Feel free to read it all and dissect, but it’s a lot of math and higher level concepts. I won’t bore you with it. Looking at the results, once again Diekman is tops. This season he’s posting a .094/.216/.188 line, establishing himself as the go-to guy if you’re in a bind. Jeffress gets a big time bump here up to two, over Bush and Dyson. It’s unexpected, given he’s scored so low already in the previous categories. Numbers don’t lie, though; in 21.2 IP he’s rocking a .164/.259/.181 slash. The refreshing thing here is none of the Ranger pitchers are terrible in this situation. Diekman and Jeffress are the clear best two, but if neither are available there’s little difference between the other three.

A few more assorted notes here regarding individual pitchers:

Jeffress is awesome with two outs and runners in scoring position, not surprising considering his high leverage prowess. He owns a .168/.288.232 line in 111 PAs over his career.

Despite the inclination to use him a lot, Kela on back to back days is dangerous. On no rest, Kela’s line is .310/.383/.476. It shifts to .207/.262/.322 when given a day off between appearances.

Meanwhile, Dyson has the best results when used on back to back days. Hitters are notching a .212/.277/.252 slash when Dyson doesn’t take a day off between outings. A valuable tool for any late-inning reliever.

While the Houston Astros continue to circle the drain, they’re glad to see Diekman leave H-Town. Diekman’s owned the Astros to the tune of an anemic .114/.204/.136 line. In eight appearances against the Astros this year, he’s kept Houston hitless while striking out 12 and walking two.

Bush’s sample size makes assessing him complicated. That said, one category he does dominate in is BB-Ref’s “Late and close” situation. Bush so far this year in 101 PAs, under those conditions limits hitters, to a .202/.257/.330 slash. It’s a great indicator of his success going forward, even when the other strong numbers are still in their infancy.

All this demonstrates that Texas is full to the brim with quality relievers who excel at different things. It’s a misuse of their talents to constrain them to roles that don’t take into account game context. For the Rangers bullpen, their best option is to cast off the roles and unlock the full potential of their relievers. If they do, the results will be positive.

A lot of wins, another AL pennant, and this time around a championship.

All stats courtesy of both Baseball Reference and Fangraphs.

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