The Diamondbacks are finalizing a contract with right-hander Merrill Kelly, according to a report from Ken Rosenthal of The Athletic. Rosenthal adds that it’s a two-year, $40MM pact. Jon Heyman of The New York Post adds that the deal is pending a physical.
Kelly, 37, returns to the team with which he has spent nearly his entire major league career. Though initially drafted by the Rays in the eighth-round of the 2010 draft, Kelly made his big league debut with the Diamondbacks back in 2019 after a four-season stay in Korea as a member of the KBO’s SK Wyverns (now known as the SSG Landers). After a pedestrian rookie campaign in the majors where he pitched to a league-average ERA in 32 starts, Kelly managed to fashion a role for himself as one of the better mid-rotation arms in the majors.
Since the start of the 2022 campaign, Kelly has pitched to a 3.47 ERA (120 ERA+) in 108 starts. He’s struck out 23.1% of his opponents while walking 7.7% in that time, leaving him with a 3.81 FIP. While Kelly’s peripherals (including a 4.03 SIERA) cast him as a step down from your prototypical front-end starter, the veteran has managed to remain a quality rotation piece eating innings at a high level (with at least 175 innings of work in three of the last four seasons) and endeared himself to fans in Arizona when he delivered a brilliant 2.25 ERA during the club’s run to the World Series in 2023.
Amid a disappointing 2025 season where the Diamondbacks were ravaged by injuries to everyone from star closers Justin Martinez and A.J. Puk to newly-signed ace Corbin Burnes, the team engaged in a sell-off at this year’s trade deadline and shipped Kelly to the Rangers in exchange for a trio of pitching prospects. Kelly put up uninspiring numbers across ten starts with the Rangers, posting a 4.23 ERA and near-matching 4.18 FIP across 55 1/3 innings of work. Even while the veteran was in Texas, an offseason reunion with the Diamondbacks was already being speculated upon. “Definite” interest in a reunion with Kelly was reported on Arizona’s side shortly before last week’s Winter Meetings, and now the sides have come together on a deal.
Turning to the deal itself, Kelly’s $40MM guarantee clocks in just ahead of the two years and $36MM MLBTR predicted for the right-hander when ranking him as the #25 free agent in this offseason’s Top 50 MLB Free Agents list. Perhaps that slight premium the Diamondbacks paid for Kelly’s services was the cost of jumping the market; while the free agent market for position players and especially relievers has kicked into gear in a big way already, Kelly is just the third starting pitcher from MLBTR’s Top 50 to sign a contract this offseason. He joins Dylan Cease and Cody Ponce, both of whom received guarantees that slightly eclipsed MLBTR’s prediction.
More to come.

