The Diamondbacks entered the offseason in search of a new first baseman, a closer and some right-handed thump in the lineup, among other items on the to-do list. They’ve broadly succeeded, acquiring Josh Naylor from the Guardians to replace free agent Christian Walker and re-signing Randal Grichuk. The Snakes haven’t found a slam-dunk closer, but they signed a new (co) ace, shocking the industry with their signing of Corbin Burnes for six years and $210MM.
While there’s still one marquee free agent reliever on the market — David Robertson has yet to sign — it appears increasingly likely that the Diamondbacks will largely go with the arms who are already in camp as they look to sort out the ninth inning. Arizona’s payroll is already projected for a franchise-record $195MM. That’s a new highwater mark by a measure of nearly $30MM. We can always adopt the “never say never” mentality as long as there are a few viable closing options on the free agent and trade markets, but the D-backs may already have their closer in house. At present, A.J. Puk and Justin Martinez appear to be the front-runners.
Puk, acquired at the deadline from the Marlins in exchange for young slugger Deyvison De Los Santos and outfielder Andrew Pintar, enjoyed a quietly dominant season in 2024. His cumulative 3.15 ERA looks more good than great, but it’s skewed by a failed experiment wherein the Marlins tried to stretch him back out as a starter early in the season. Puk was clobbered for 17 runs in 13 2/3 innings. He moved back to the bullpen, and from that point forth was arguably the best reliever in the sport.
After giving up 17 earned runs in his four starts, Puk only allowed 11 more earned runs for the entire season. He posted a 1.72 ERA out of the bullpen in 2024, fanning a colossal 35% of his opponents against a terrific 5.1% walk rate. Opponents averaged only 86.6 mph off the bat against him in that time with a middling 32.6% hard-hit rate. Per Statcast, only five of his opponents’ batted balls in that time were barreled. Puk allowed a run in his second appearance with the D-backs and then went on a run for the ages, rattling off 23 2/3 scoreless innings with a 38-to-4 K/BB ratio. He punched out 44.7% of opponents in that career-best run.
Martinez was nearly as dominant for the early portion of the 2024 season. The young flamethrower posted a 1.60 ERA with a 27.5% strikeout rate and mammoth 64.5% grounder rate in his first 50 innings of work. His exit velocity and hard-hit rate were nearly identical to Puk’s marks as a reliever. An 11.5% walk rate was in clear need of improvement, but for a 22-year-old who averaged better than 100 mph on both his four-seamer and sinker, it’s hard to draw up a more promising start.
That run of dominance didn’t last the full season, however. While Martinez remained a solid reliever, his 3.90 ERA over the final 27 2/3 innings of his season was far less eye-catching. The young righty’s strikeout rate actually ticked up during that span, perhaps due to roughly doubling the usage of his four-seamer at the expense of his sinker, but his grounder rate fell sharply. There was surely some poor fortune in play, as Martinez was hampered by a .388 BABIP during this stretch despite continuing to limit hard contact (and allowing only one home run).
Whether in the ninth inning or working in a setup capacity, both Puk and Martinez will be in high-leverage roles this season. They were two of the D-backs’ top five arms in terms of their average leverage index — but not the top two. Paul Sewald’s departure in free agency subtracted one of Arizona’s top leverage arms, but it was actually righty Ryan Thompson who found himself most frequently in high-leverage spots, followed by Martinez and then by fellow righty Kevin Ginkel.
The 32-year-old Thompson isn’t the prototypical power arm often associated with pressure-packed, late-inning situations. He’s a sidearming righty who averages just 91 mph on his sinker and 92.5 mph on his lesser-used four-seamer. Thompson’s 19.1% strikeout rate was well below the 23.4% league average among relievers. However, he boasts a 61% grounder rate, rarely issues walks (5.5%) and posted nearly identical results versus righties (.254/.299/.377) and lefties (.254/.293/.377). He picked up two saves and 24 holds.
Ginkel, 30, has quietly emerged as a key arm in Phoenix. He was never a top prospect and didn’t truly establish himself as a reliable reliever until his age-28 season, in 2022. Over the past three seasons, he’s tossed 164 2/3 innings with a 2.95 ERA. It’s not necessarily flashy, as Ginkel is more good-than-great in terms of strikeout rate (26.5%), walk rate (7.3%), swinging-strike rate (12.5%), ground-ball rate (47.1%) and fastball velocity (96 mph average) in that time. Even with the lack of one standout area in which he truly excels, his above-average rates across the board have made him a consistent and reliable late-inning option for manager Torey Lovullo.
Also entering the mix is 34-year-old Kendall Graveman, who signed a one-year, $1.35MM deal after missing the 2024 season due to shoulder surgery. With 24 saves and 56 holds from 2020-23, Graveman is no stranger to late-inning work. After moving to the bullpen in Sept. 2020 with the Mariners, Graveman rattled off 197 1/3 innings with a 2.78 ERA, 24% strikeout rate, 10.3% walk rate and 49.2% grounder rate. At his best, Graveman averaged better than 96 mph on his heater and offered a Ginkel-esque blend of above-average strikeout, walk and ground-ball rates while sitting around 96 mph with his main offering. Whether he can return to that form in the wake of last year’s shoulder surgery is an open question.
However it shakes out, the Snakes look to have a solid quintet of arms rounding out the late-inning group at Chase Field. Lefty Joe Mantiply offers a solid middle-inning complement who has picked up around 12 holds per year over the past four seasons. A starter who doesn’t make the rotation (e.g. Jordan Montgomery, Ryne Nelson) could hold down another spot. Bryce Jarvis, Kyle Nelson and non-roster candidates like Shelby Miller, Scott McGough, John Curtiss and Josh Winder (among others) will vie for what’s likely one open spot.
There’s enough left on both the trade and free agent markets that it’s not impossible to envision a change still impacting Lovullo’s bullpen composition. Signing Robertson might be too pricey, likely pushing the D-backs into $200MM+ payroll territory for the first time, but if GM Mike Hazen ultimately finds a trade partner for Montgomery, any savings could make Robertson feel likelier. The Padres have been open to offers on Robert Suarez. Trading within the division probably isn’t either team’s first choice, though. A Ryan Helsley trade before next offseason feels virtually inevitable but also seems likelier to happen in-season at this point.
In any bullpen, there’s almost always room for one more addition. But, if this is the group the D-backs take into the season, they can still feel good about an impressive breadth of experienced late-inning arms who have the makings of a strong overall unit.
I think AZ finishes in second over SD.
Who’s first ?
“Who’s first”…If you meant who’s in first in the year 2039 I’d say the Dodgers. Come to think of it, the Dodgers will be in “first” from 2025-2038 too.
The Diamondbacks are not as far back from the Dodgers as you think.
One game back will be fine.
Maybe so but I think the Diamondbacks will be one of the toughest outs in the playoffs. They definitely know how to develop position players.
This. The Diamondbacks potential starting 5 (Burnes/Gallen/Rodriguez/Kelly/Pfaadt) is as good as any in the game. And breaking down the offense they are right there with the Dodgers. The Division title for the Dodgers is not a sure thing
The diamondbacks had the best offense in baseball last year with Carroll having a drastically bad first half.
nothing in baseball is a sure thing.
I wonder who will pay the deferred payments of over 1 billion dollars starting in 2046. Will it be the future owners of the Dodgers or MLB have to foot the bill.
@desert
You wonder because you have no clue. The deferred money has to be put away every year. After all this time one would think you have paid just a little bit of attention.
Sal,
What’s the “put away” process ? Bc I’m almost certain it goes into an account the dodgers still collect all the interest growth
Plus the have the highest ticket cost and attendance in the league. Then their Japanese revenue is greater than the bottom 3rd of leagues annual revenue.
Stop trying to validate their desire and ability to manipulate the rules to give them an unfair advantage over the rest of the league. Fair Play Dodgers is who they are and who they will remain henceforth
Are you kidding when you ask who finishes first in the NL West?
You.
Took.
The.
Bait.
I agree, but the surprise may be that the Giants move up to 3rd and the Padres drop to 4th.
We’re still talking about the 21st century, yes?
Lol
Agreed on AZ finishing second. I think SD ends up with a better record than any central division team and misses the playoffs.
Martinez is the closer, but Puk is the high leverage guy who pitches in the toughest situation regardless of inning.
I am not certain Puk has the, uh, gumption to be a closer. Can be terrific 8th inning guy but he struggled in the 9th for Miami. Just an observation from watching. Not for nor against him or Arizona. More for them actually
NL West will more than likely be the Dodgers. As for 2-4, it could be interesting with AZ, SD and SF. I think they all have the ability to finish in any of those spots, that’s just me.
Seems like a pretty solid group dont know that they really need an outside addition
Why has Robertson not signed yet? Does he think he’s worth 10+Million
He represents himself, is coming off of a strong season, and already secured his pension. If he doesn’t want to take a pay cut? More power to him. He’s earned the right to be picky.
I risk being burned at the stake saying this, but I hope Shelby Miller shows out well enough in ST to win an MLB job.
Every RP currently on the 40-man (except for Graveman) have options remaining and none of those guys (again, except Graveman) have the service time needed to refuse a AAA assignment. Having a second pitcher “locked in” to their spot like Graveman isn’t the worst thing in the world.
Shelby doing well means that Drey Jameson (who was sitting around 97 mph on his Sinker today and touched 100 mph with his 4S; plus, his Slider is still his bread and butter) can get settled into game speed and polish his command at AAA; he should still be up sooner than later
Another interesting name to keep an eye on is Conor Grammes; he’s been plagued by injuries during his professional career, but he also didn’t start full-time pitching until after he was drafted (seriously, he hit .330/.428/.524 with 35/37 BB/K in his final 271 PAs for Xavier, and appeared at every position except C/CF while in college/summer league).
He’s was pretty consistently sitting around 96 mph with his Sinker (touching 98 mph) and still has a nasty Slider. If they ironed out his mechanics enough that his command is usable, he could be a legit weapon (and he’s not currently on the 40-man).
The Snakes also get Saalfrank back at the beginning of June; hopefully he spent his off time polishing his mechanics and not gambling lol
Would it be nice to have a lockdown Closer? Absolutely, but if none of those guys can take the step, the DBacks are stacked with enough depth everywhere that getting a CP is really the only logical addition to be added at the deadline. I like where the team is sitting currently, though.
Highheat
Great analysis, thanks.
You commented above about Robertson’s salary expectations, but at age 40, do you think he is a significant upgrade over the in-house closer candidates? I don’t think he is even marginally better. Yes, a select few pitchers remain effective into their late 30’s, early 40’s, but at a diminished effectiveness.
No problem, Scott! I appreciate the appreciation lol
I know projections aren’t everything (especially for RPs), but pretty much every projection system listed on FG has him being a little better than everyone in the bullpen, except for Martinez and Puk.
I wouldn’t consider him a significant enough upgrade over Ginkel, Graveman (if he can meet his projections), Mantiply, Martinez, Puk, or Thompson; at least not to spend as much money as he would like
That being said, it’s almost certain that he’d be a huge upgrade over whoever wins the last non-MIRP slot in the bullpen.
The problem with that, though, is that he’d have to be added to the 40-man right after signing, so a spot would have to be cleared. Letting NRIs duke it out in ST gives a little more roster flexibility.
And FWIW, he hasn’t lost any velo on his Cutter to this point; last season he was actually tied with the year before for his career high velo. I’d guess that means that we’re going to see some degradation to his velo next season, at least a little bit.
Justin’s ceiling is far too high to commit the 9th inning to Robertson, and we don’t have the spare change to pay 8 figures for a non-Closer.
That being said, if he’s still unemployed during the season and Hazen can deal Montgomery, I’d keep him on speed dial and see what kind of prorated contract we’d be talking about. That’s wishful thinking, but I always like to at least entertain the best case scenario.
Good post! What this Spring Training scenario is saying by the D’Backs front office right now is our closer is in camp right now. I’m thinking is that Drey Jameson has the hopes of the front office, but it may not be until June before they give him the shot to be the closer. April and May will be the old bullpen by committee approach.
Thanks dawg! Sorry, I couldn’t help myself lol
Drey is such a fascinating player for a number of reasons:
Firstly, he’s said before that he loves pitching as a SP, but he’s also talked about how much he loves coming into high-leverage spots; the dude is just an adrenaline junkie.
Secondly, if you look at at his movement profile on BaseballSavant, his Slider looks like it’s all over the place. Somebody that didn’t know any better would say its shape is erratic and inconsistent, but he’s talked in at least one interview about how he actually has 3 different Slider variations. The dude has a God-given feel for spinning breaking balls.
Thirdly, even though his Sinker is clearly better than his 4S, both are nasty pitches when they’re located well (and he locates his 4S better, which intuitively makes sense)
Lastly, he’s a SUPREMELY gifted, fast-twitch athlete; I mean, anybody that can beat Corbin Carroll in a footrace has to be. Those are the kinds of players that teams generally bet on figuring out their mechanics.
It’s for all of those reasons that I’ve been saying for a couple of years that he would probably take well to learning a Cutter (he already throws two fastball types, and has three Slider variants; if anyone should be able to pick up a Cutter quickly, it should be a high-end athlete with those traits).
If we throw a Cutter in the mix, that’s the exact same arsenal as Merrill Kelly, but all of Drey’s pitches are nastier. That would give him a lot more leeway to aggressively attack the zone (which he loves to do), and him learning how to pitch somewhat like Merrill would be absolutely devastating.
Martinez
Give the role to Martinez and use Puk in other high pressure situations against lefties.
Dbacks fans knew Martinez tailed off late in the season. I did not know over his last 27 2/3 he; relied heavily on his 4-seamer, moved away from his sinker, and saw his GB% drop significantly and his BABIP shoot up to .388. Im anxious to see his, and the Dbacks, adjustments early in the ’25 season. Great info, Steve. Thank you.
If i was AZ i woulda kept deyvison
40 hr as a 20 yr old in AA is tremendous
Might not translate to the majors but we’ll never know now. Thats potential you dont give up on
It’s not so much “giving up on” DDLS as it was giving up something of value to get something of value (and DDLS was almost eligible for the R5 Draft, so roster decisions regarding him were about to become much trickier)
Sure, he has some exciting pop, but I’d trade DDLS+Pintar for a couple seasons of a high octane LHRP every single time. I’m honestly surprised that Miami wasn’t pushing for more in the deal.
One thing to always keep in mind when evaluating AZ prospects is that their AA and AAA fields are among the most hitter friendly in the entire sport. DDLS carried on with the power once he reached Miami’s system which is great! He also slid backward in other ways which is normal and could be attributed to many things. Personally, I’m happy to have Puk and for now, won’t regret DDLS.
What I’m most intrigued to see for him in 2025 is how he compares to other players in a full season away from AZ’s pipeline. He was undeniably outstanding in Amarillo and Reno and then strangely below average in Jacksonville. Hopefully Miami can help right that ship and give him the needed development time to be ready for MLB pitching.
@spence
The way i see it, a prospect gets used to a tm & a system & coaches & development style. He hit 40 hr with 120 rbi, at 20 yrs old. Remarkable
Now you move him to a different team, new coaches new style, and less successful organization overall. Not good for development of young player. Im afraid he is doomed in miami.
As far as the trade goes acquiring a solid but unspectacular RP fof a ttop prospect is a mistake but im no GM, just my feeling
Prospects get traded and succeed all the time. As do MLB players. I imagine the transition period can be rough, but I don’t think it has an outsized impact on development unless the acquiring team is horrendous at that process. An arguement could made that’s true of Miami, but I prefer to judge by player than organization unless the org in question is the Angels; they rush everything to the detriment of their players and fans. It’s a choice.
AJ Puk is one of the best relievers in baseball currently (when you remove the ill-fated starting experiment stats from 2024). I make this move 99/100 times, especially given how the first half season played out. DDLS would have to turn into Big Papi for me to change my mind. Or Puk would have to devolve into Shelby Miller, Madison Bumgarner or Jordan Montgomery in Arizona, which seems unlikely. Value for Value is what trades are all about. Arizona gave up potential value and control in favor current value and limited-ish control.
@chandlerbing
Puk pitched 57.2 IP as a RP last season, his numbers were: 1.72 ERA, 2.06 FIP, 2.54 xFIP, 35% K%, 5.1% BB%, .224 BABIP against, and 0.75 WHIP. That’s not “solid but unspectacular”, that’s ELITE. And he’s controlled through the 2026 season.
Guys like that generally require dealing at least a lower-end Top-100 prospect plus an extra piece or two for their last half-season of team control.
For the DBacks to give up a young guy that doesn’t fit their organizational philosophy (DDLS doesn’t hit for contact well, doesn’t run well, and doesn’t field well; he was also going to be eligible for the R5) and an injury prone RHH? That’s an absolute steal
I think you’re getting a bit too enamored by the pop; yes, longballs are exciting, but he’s already a corner-only guy and doesn’t fit within the DBacks offensive/defensive philosophy.
Also keep a close eye on Jameson. He’s been pretty solid in Spring Training so far, throwing very close to triple digits with good control.