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Dodgers trade their own fading top prospect for regressing Rockies reliever with elite fastball

Weird.
May 29, 2026; Denver, Colorado, USA; Colorado Rockies relief pitcher Seth Halvorsen (54) delivers a pitch in the sixth inning against the San Francisco Giants at Coors Field. Mandatory Credit: Ron Chenoy-Imagn Images
May 29, 2026; Denver, Colorado, USA; Colorado Rockies relief pitcher Seth Halvorsen (54) delivers a pitch in the sixth inning against the San Francisco Giants at Coors Field. Mandatory Credit: Ron Chenoy-Imagn Images | IMAGN IMAGES via Reuters Connect

Inter-division trades feel especially rare in the NL West, but if anyone might be willing to trade with the Dodgers, it's the Rockies. It still doesn't happen often, but these two teams are on exact opposite sides of the standings and have been for years. The Rockies have very little to lose by dealing with LA every so often.

On Monday, Andrew Friedman and his Rockies counterpart Paul DePodesta pulled off a weird one: reliever Seth Halvorsen to the Dodgers; No. 25 prospect Landyn Vidourek and former top prospect Nick Frasso to the Rockies.

Halvorsen, Colorado's No. 18 prospect last year, pitched a promising 12 1/3 innings in 2024 after debuting in late August, but regressed almost immediately in 2025, posting a 4.99 ERA in 39 2/3 innings before going onto the IL in August, where he stayed for the rest of the season.

He's been going up and down between Triple-A and the majors for most of the 2026 season but hit the IL again on July 4. He just started a rehab assignment on Sunday and pitched a scoreless inning before being shipped off to the Dodgers.

Dodgers trade for former Rockies top prospect Seth Halvorsen, send top-30 prospect Landyn Vidourek and Nick Frasso to Colorado

Frasso is the real surprise here. He was the Dodgers' top pitching prospect in 2024 but missed the entire season after undergoing surgery to repair a torn labrum before Opening Day. He was never the same after making his return to the mound in 2025 — he pitched 77 innings for a 5.49 ERA — but the Dodgers seemed set on trying to fix him. They non-tendered him after the 2025 season, but he still re-signed a minor league contract with them.

He's at least pitched better this season than last, but a 4.74 ERA still isn't good, and he spent a month on the IL from Opening Day into late April.

Halvorsen, funnily enough, also has a 4.74 ERA (but at the major league level). In his last appearance before going onto the IL, he pitched a three-run inning against the Marlins. He still has elite fastball velocity, with an average 98.8 MPH that puts him in the 98 percentile of all pitchers, but this is an especially curious trade given that he actually ... strikes out more batters at Coors Field?

He's expected to head to Triple-A, but if the Dodgers were willing to give up a top prospect for him, it stands to reason that we'll see him in the majors at some point this season.

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