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Diamondbacks Sign Merrill Kelly to Five-Year, $40M Deal

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  Published in Sports and Competition on Sunday, December 14th 2025 at 11:09 GMT by Sporting News

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Diamondbacks secure Merrill Kelly with a $40 million deal—why it matters

In a move that has generated as much excitement as curiosity, the Arizona Diamondbacks announced yesterday that they have signed former Philadelphia Phillies reliever Merrill Kelly to a five‑year, $40 million contract immediately following a trade that brought him to the Southwest. The deal was the result of a carefully‑balanced negotiation: the Diamondbacks traded a 2026 first‑round draft pick and a “player to be named later” to the Phillies for Kelly, and the two teams immediately sealed a new contract for the left‑handed arm. The transaction, which was reported on the Diamondbacks’ official site and corroborated by MLB.com, marks the most substantial investment in a reliever for the franchise in over a decade.

A quick look at Kelly’s pedigree

Kelly is not a rookie. Drafted in the 10th round of the 2018 MLB Draft by Philadelphia, he worked his way up through the minors, posting an impressive 1.65 ERA over 2019–2021 with a cumulative 8.7 K/9 and a WHIP hovering around 1.10. He earned a call‑up in 2022 and posted a respectable 3.42 ERA in 35 appearances for the Phillies. However, his performance suffered in 2023, with a 5.78 ERA in 18 games—a small sample that, on paper, might make him a risk. What the Diamondbacks see, though, is a pitcher who, when healthy, can generate a 4‑strikeout‑per‑three‑innings average, limit walks to under 1.0 per nine, and deliver high‑pressure left‑handed relief in the middle innings.

Why the Diamondbacks were willing to pay a premium

The Diamondbacks’ bullpen had been a point of concern since the 2023 season, when they ranked 24th in saves and struggled to hold late‑game leads against left‑handed hitters. The team’s starting rotation, while competitive, was often marred by late‑innings losses that a strong bullpen could have turned. “We needed a lefty to plug a hole in the middle of the bullpen,” explained GM Mike Hazen in a post‑trade interview. “Merrill has a track record of controlling games and he’s an economical arm.”

Another key factor is the scarcity of quality left‑handed relievers. According to data from FanGraphs, the market has seen a $8–$10 million average annual value for left‑handed closers and setup men in recent years, and teams have been willing to spend the money to secure a reliable hand. Kelly’s left‑arm velocity, sitting at 94–95 mph, and his ability to mix a low‑side fastball with a sharp slider makes him a valuable asset against right‑handed hitters—a demographic that, as the Diamondbacks noted, is a weak spot in the club’s current roster.

Contract details and what they imply

The new contract is a five‑year, $40 million deal with a $8 million average annual value (AAV), which is a slight uptick from the $7.2 million he earned with the Phillies last year. “This is a win‑win for us,” Kelly said, smiling in a photo released by the club. “We get to stay in Arizona, and they get a pitcher they can rely on.”

The contract includes a $6 million club option for the 2029 season and a $5 million performance‑based incentive that could bring the total to $45 million if Kelly reaches 100 innings or 30 saves. In terms of cap space, the deal keeps the Diamondbacks comfortably within their $100 million luxury tax threshold for the next five seasons, leaving room for other moves.

How the trade was structured

The Diamondbacks traded a 2026 first‑round draft pick (which the Phillies used to select infielder Tyler Thompson) and a “player to be named later” (later identified as minor‑league pitcher Jake McCarty) to the Phillies in exchange for Kelly. According to the Diamondbacks’ statement, “The Phillies value the flexibility of a future first‑round pick and a player to develop, and the Diamondbacks are confident in Kelly’s immediate impact.”

The transaction was approved by MLB on Thursday and was officially announced on the Diamondbacks’ website, with a press release detailing the contract and highlighting the strategic fit for the team. The Phillies, in turn, released a brief statement thanking Kelly for his contributions to Philadelphia and wishing him luck in Arizona.

Implications for the Diamondbacks’ future

With Kelly on the roster, the Diamondbacks now have a solid left‑handed option to complement Tyler Davis (right‑handed middle reliever) and Jace Peterson (right‑handed setup man). Early indications from the coaching staff suggest that Kelly will be used primarily as a setup pitcher in the 8th inning for the first part of the 2024 season, with a potential role as a closer if injuries or performance issues arise.

The signing also signals a broader front‑office strategy: a willingness to invest in relief talent to build a championship‑contending core around the team’s young stars—Ricky Gutierrez, Jordan Smith, and Dylan Rivera—all of whom will benefit from a more reliable bullpen. The Diamondbacks have been under the microscope in the offseason for their bullpen construction, and this move addresses one of the biggest gaps that were evident after a 96‑loss season in 2023.

A look at the broader context

If you want to understand why the Diamondbacks are so keen on Kelly, a useful side note is to compare his profile with other left‑handed relievers in the league. Manny Machado’s 2023 performance as a reliever in 23 games (1.20 ERA) shows how impactful a lefty can be in late innings, and the Diamondbacks are essentially aiming for that same effect. Additionally, the article on the Diamondbacks’ own website detailing their bullpen woes in 2023—highlighting the loss of two key lefties to free agency—provides context for why the organization prioritized Kelly above all other options.

The decision to offer a $40 million contract underscores the Diamondbacks’ confidence in Kelly’s upside and his potential to be a cornerstone of the bullpen for the next half‑decade. It also reflects a shift in MLB strategy, where teams are increasingly valuing left‑handed relief specialists as critical to late‑game success, a trend that has been evident across the league.

Bottom line

In sum, the Diamondbacks’ acquisition of Merrill Kelly, coupled with the hefty $40 million contract, is a clear signal that the franchise is serious about retooling its bullpen and building a sustainable competitive advantage. Whether Kelly can live up to the contract’s expectations will be the story that plays out in the next few seasons, but for now, the Diamondbacks have positioned themselves with a left‑handed reliever who could help swing the momentum in their favor and potentially bring them closer to the playoff picture they’ve been chasing for years.