Will Kempner

1:08pm: The Marlins have now officially announced the Paddack and Kempner moves.

8:22am: The Marlins are designating veteran righty Chris Paddack for assignment, reports Ken Rosenthal of The Athletic. The team has yet to formally announce the move or a corresponding transaction, but Christina DeNicola of MLB.com reports that reliever William Kempner will be recalled from Triple-A Jacksonville. It’s Kempner’s first big league promotion. He’ll be making his MLB debut when he gets into a game.

It’s a hook on the 30-year-old Paddack, who signed a one-year, $4MM deal to return to the organization that originally drafted him (but traded him to the Padres in a 2016 swap for reliever Fernando Rodney). The hope had been that Paddack could provide some stable innings following offseason trades of Ryan Weathers (to the Yankees) and Edward Cabrera (to the Cubs). He looked great this spring (two runs, 13 innings pitched) but was shelled in seven regular season appearances with Miami (six of them starts).

Paddack only completed five frames once in his return to the Marlins organization: a quality start against his former Tigers teammates in Detroit (six innings, two runs). He allowed at least two runs in fewer than five innings each other time he took the mount, including a trio of appearances that saw him tagged for five, seven and eight runs apiece. His time with the Fish will draw to a close with a 7.63 ERA, an 18.5% strikeout rate and a 6.8% walk rate in 30 2/3 innings.

A former top prospect, Paddack debuted with a 3.33 ERA in 140 2/3 innings for the 2019 Padres. He’d have been a Rookie of the Year finalist, if not winner, in most seasons, but he happened to be up against Pete Alonso‘s 53-homer debut, Michael Soroka‘s 174 2/3 innings of 2.68 ERA ball, Fernando Tatis Jr. and Bryan Reynolds; excellent as Paddack’s debut was, he didn’t even receive a down-ballot vote.

Injuries have held Paddack back in the years since. He missed time with a UCL sprain in 2021 and then underwent his second career Tommy John surgery — his first came as a prospect — with the Twins in 2022. His 2024 season was cut short by a forearm strain.

In 471 2/3 innings since his terrific debut campaign, Paddack has posted a 5.23 ERA. He regularly shows strong command but has never missed bats at the same level he did as a rookie. He’s also been far too homer-prone, serving up an average of 1.55 round-trippers per nine frames from 2020-26.

It’s fair to wonder how many more rotation opportunities Paddack will get. He struggled out of the rotation more often than not in Minnesota, and the Tigers dropped him to the bullpen after just seven starts last summer following a trade to acquire him. The Marlins, obviously, are moving on in quick fashion.

Perhaps another club with a pile of rotation injuries will plug Paddack into its starting five when he’s inevitably released, but other clubs will surely be interested in what he might look like as a reliever. When Paddack returned from his second Tommy John procedure with the Twins late in the 2023 season, he pitched 8 2/3 innings between the regular season and postseason, allowing three runs with a 14-to-1 K/BB ratio. He looked particularly dominant in the postseason, and his typically 93 mph four-seamer was averaging 95.5 mph. He was hit hard out of the Detroit ‘pen last year, but they were using him as a long man, and not the short-relief role in which he excelled during that brief, post-surgery run with the Twins.

For the time being, the Marlins will have five days to trade Paddack or release him. (They could also place him on outright waivers, but he’d surely clear due to his salary and struggles, and Paddack has enough service time to reject an outright assignment while retaining his remaining guaranteed salary.) It’s possible they’ll find a taker who’s willing to pay a nominal portion of that guarantee, but the most common outcome in these scenarios is a simple release. The Marlins will remain on the hook for that $4MM salary. A new team would owe Paddack just the pro-rated league minimum for any time spent on the major league roster.

As for the 24-year-old Kempner, he came to the Marlins in a Jan. 2025 swap that sent international bonus pool space back to the Giants. The 2022 third-round pick had a big season in the minors last year between High-A, Double-A and Triple-A, combining for a 2.26 ERA with a 33.6% strikeout rate in 67 2/3 frames of relief. Command is a clear flaw, as Kempner walked 14.1% of his opponents along the way.

Kempner was selected to the 40-man roster back in November, thus shielding him from December’s Rule 5 Draft. He’s out to a tough start in ’26, with a 6.46 ERA in his first 15 1/3 frames at Triple-A. However, he’s fanned a preposterous 47.9% of opponents and allowed only a 63.8% contact rate. Kempner sits 95.5 mph with his heater and pairs it with a low-80s slider. He has a seldom-used cutter for a third offering but is primarily a two-pitch righty.

Kempner gives Miami a fresh arm for the next few days. Paddack’s spot in the rotation would be up this weekend. De Nicola lists Braxton Garrett and top prospect Robby Snelling as options to step into the rotation. Both pitchers have sub-2.00 ERAs with strong strikeout rates (Snelling in particular) but poor walk rates through their first handful of starts in Jacksonville.