While trades of relievers at the deadline are rarely the hottest moves featuring the best prospects, there are usually a lot of them. As the summer reaches its peak, contenders start to think about their bullpens down the stretch and beyond, and with modern bullpens seemingly as densely populated as the cover of Sgt. Pepper’s, there’s always room to add a quality arm. Let’s dig through them!
Editor’s Note: This reliever roundup doesn’t include the more recent trades for Carlos Estévez, Nick Mears, and Jason Adam. Ben Clemens will cover those moves in a separate post.)
The Arizona Diamondbacks acquired LHRP A.J. Puk from the Miami Marlins for 1B/3B Deyvison De Los Santos and OF Andrew Pintar
Don’t focus too much on the raw ERA or unimpressive walk rate when judging the merits of Arizona’s trade for A.J. Puk. Partially in response to their myriad rotation injuries in the spring, the Marlins took Puk’s attempt to get back into the rotation seriously, and he started the season there after a successful spring. I still think that was a well-founded experiment, but it didn’t pay dividends for Miami. Puk was absolutely dreadful as a starter, and it wasn’t long before he landed on the IL with shoulder fatigue. His four starts resulted in a 9.22 ERA, a 6.29 FIP, and an alarming 17 walks in 13 2/3 innings. He was moved back to the ’pen upon his return in mid-May, but the damage to his seasonal line was so significant that it still looked underwhelming at the time of the trade (4.30 ERA, 3.62 FIP, 44 IP).
As he has the last few years, Puk has dominated as a reliever; across 30 1/3 relief innings with the Marlins, he had 33 strikeouts and, perhaps most importantly, only six walks. The result was a 2.08 ERA/2.42 FIP, with batters managing a bleak .159/.204/.252 against him. The Diamondbacks are short on lefty relievers, with Joe Mantiply shouldering a very large share of the southpaw burden. Puk has historically been better against righties than Mantiply, so he can be used in more situations.
In return, the offense-starved Marlins pick up a couple of possible bats to add to their farm system. With a .325/.376/.635 and 28 homers combined at two levels in the high minors this year, Deyvison De Los Santos looks impressive at first look, but it’s important to contextualize those numbers. He’s playing in some very high offensive environments and there’s a lot of hot air to remove from those numbers to turn them into expected MLB performance. ZiPS translates his 2024 minor league performance to .263/.302/.428 in the majors and projects for wRC+ lines between 95 and 110 in the coming years with the Marlins. Now, that’s enough for the Marlins to be interested in him and chase any upside, but don’t be shocked if he’s not an offensive force.
Similarly, ZiPS translates Andrew Pintar’s season at .235/.302/.365 and doesn’t see a ton of growth from him offensively, viewing him as most likely to be a spare outfielder if he reaches the majors. I talked a bit with my colleague Eric Longenhagen about him on Friday and Eric still grades Pintar as a fifth-outfielder type, which is about how ZiPS evaluates him. Still, as with De Los Santos, Pintar’s interesting enough for a team like the Marlins to take a chance on him and give him an extended look; projections are frequently wrong, after all, by design!
The Seattle Mariners acquired RHRP Yimi García from the Toronto Blue Jays for OF Jonatan Clase and C Jacob Sharp
With the Blue Jays as short-term sellers, it’s hardly surprising to see them trade Yimi García, who is a free agent at the end of the season. His three-year, $16 million deal turned out to be a success for the Jays; he’s been worth 2.7 WAR and put up a 3.44 ERA/3.28 FIP over 163 appearances across two-plus seasons. This season has arguably been his best, as he’s striking out nearly 13 batters per nine innings. With Gregory Santos limping a bit after a knee injury – not believed to be severe – García slots in behind Andrés Muñoz in the Mariners’ bullpen pecking order. Seattle’s relief corps has been in the middle of the pack, but adding García to a group that features Muñoz, a healthy Santos, and Taylor Saucedo gives the M’s an excellent quartet of high-leverage guys, which could be crucial in what’s shaping up to be a tight AL West race.
Jonatan Clase was listed with a FV of 40 earlier this month when Eric ran down the top Mariners prospects, but with Julio Rodríguez entrenched in center field and backed up by other outfielders who can capably cover the position (namely Victor Robles, Cade Marlowe, and even, in a pinch, newly acquired Randy Arozarena), Clase’s ability to do so was simply less valuable in Seattle. Beyond that, the team needs more thump in its lineup at this point, and that’s not Clase’s speciality. For the Jays, Kevin Kiermaier is a free agent after the season and the organization has a real lack of center field candidates anywhere near the majors. ZiPS projects Clase at .218/.291/.373 with an 84 wRC+ for 2025 but views him as an above-average defensive center fielder, suggesting that he’s at least a reasonable stopgap option or a useful role player for Toronto. Jacob Sharp has been off the radar as a prospect, a fairly small catcher who is hitting decently well, albeit as a 22-year-old in A-ball.
The New York Mets acquired RHRP Ryne Stanek from the Seattle Mariners for OF Rhylan Thomas
The Mets have an extremely unimpressive bullpen once you get past Edwin Díaz, and now that they are firmly in contention for an NL Wild Card spot this season, they are looking to improve their relief corps. Ryne Stanek hasn’t excelled in Seattle, but the veteran reliever still throws in the high-90s, is durable, and misses bats. Guys like that will always resurface. Especially after trading for García, the Mariners have better options than Stanek to pitch in high-leverage, non-save situations. But that’s not the case in Queens, and he’s a welcome addition to the bullpen.
Rhylan Thomas isn’t a high price to pay and he largely fills a similar role to the departed Clase in Seattle’s organization, though he’s a different type of player. As a high-contact hitter, Thomas may fare well in pitcher-friendly T-Mobile Park. ZiPS sees Thomas as a .263/.313/.333 hitter with plus defense in the corners in 2025.
The Tampa Bay Rays acquired RHRP Cole Sulser from the New York Mets for cash
Cole Sulser is a relative soft-tosser who relies on deception. He had a big breakout season in 2021, but after a trade to the Marlins, he struggled with his command in ’22 and had his season marred by a lat injury that landed him on the 60-day IL. A shoulder injury ruined his 2023 and he’s spent ’24 trying to rehabilitate his value in the minors for the Mets, with mixed results. This is the third time the Rays have traded for Sulser in his career, so they seem to see something in him, and given Tampa Bay’s record with random relievers, I wouldn’t be shocked if he became useful for the Rays next season.
Cash is slang for currency, which can be exchanged for goods and services. It can be vulnerable to inflation, and because of this, it doesn’t represent a stable medium of exchange in some countries. But cash also has the benefit of being very flexible.
The Chicago Cubs acquired RHRP Nate Pearson from the Toronto Blue Jays for OF Yohendrick Pinango
Nate Pearson was rightly a hot prospect back in the day, and there were good reasons to think he’d play a key role in Toronto. Both scouts (he graduated at a FV of 55 here) and projections (ZiPS was a fan) thought a lot of his abilities, but the question was how he’d hold up physically as a starter. This worry turned out to be a real issue, and for the most part since 2019, his seasons have been marred by a wide variety of nagging injuries, costing him significant development time. Pearson throws hard, but he’s still rather raw, a problem given that he turns 28 in a few weeks and he has only two years left of club control after this one — not a lot of time for a reclamation project. The Cubs have decided to take a shot at fixing him. They are short-term sellers, but if Pearson pays off, he could be a significant player for their ’pen in 2025 and ’26.
Yohendrick Pinango is rather raw as well, a corner outfielder with decent power upside who hasn’t really shown that home run pop in the minors so far. The Cubs are kind of stacked with raw, interesting outfield prospects, while the Jays are rather short of them, making Toronto a better home for Pinango. ZiPS only translates Pinango’s 2024 season to a .344 slugging percentage; he hit well in High-A, but that was as a 22-year-old in his third stint there. Like Pearson, Pinango’s a lottery ticket.
