The Dodgers and Rockies pulled off an intra-division trade on Tuesday, sending hard-throwing right-hander Seth Halvorsen from Colorado to Los Angeles in exchange for minor league righty Nick Frasso and minor league outfielder Landyn Vidourek. Both teams announced the deal. Halvorsen, currently on the 15-day injured list with shoulder inflammation, will continue his rehab assignment at Triple-A Oklahoma City before the Dodgers decide whether to option him or drop him straight into the major league bullpen.
Translation: the team with baseball’s best record at 63-37 just bought a lottery ticket that throws 99.6 miles per hour.
Halvorsen, 26, brings the kind of raw stuff that makes player-development departments drool and opposing hitters check their pulse. Colorado’s seventh-round pick in 2023, he reached the majors barely a year after being drafted and has logged 71 innings across parts of three seasons. The results have been mixed — a 4.31 career ERA, a bloated 12.1% walk rate, and a homer-prone 1.52 HR/9 — but the underlying components are loud. His four-seamer averages 99.6 mph. His swinging-strike rate sits at 12.4%. His ground-ball rate is a sturdy 48.8%.
The splits tell an even sharper story. In 19 major league innings this season, Halvorsen has a 4.74 ERA. In 17⅓ Triple-A innings, he’s posted a 2.04 ERA with a 32.4% strikeout rate, a 9.5% walk rate, and a heater averaging 99.9 mph. The Dodgers are betting that the gap between those two lines is a development problem, not a talent problem — and few organizations have a better track record of closing that gap. Evan Phillips, Will Klein, Alex Vesia, and Anthony Banda all arrived in Los Angeles as unestablished arms who turned into reliable bullpen pieces. Halvorsen fits that mold, with more than five seasons of club control and two option years remaining after this one.
The Dodgers’ current bullpen hardly screams desperation. Tanner Scott has locked down the closer role in Edwin Díaz’s absence. Klein, Vesia, Edgardo Henriquez, and Jack Dreyer all own ERAs under 3.00. But Díaz hasn’t pitched since late April after elbow surgery, Blake Treinen hit the IL in mid-June with elbow inflammation, Brusdar Graterol underwent back surgery and hasn’t appeared all season, and Ben Casparius has been out since mid-April with his own shoulder trouble. Depth isn’t a luxury. It’s a survival mechanism.
Colorado’s return centers on Frasso, a 27-year-old right-hander who cracked top-100 prospect lists at MLB.com (No. 80), Baseball America (No. 97), and Baseball Prospectus (No. 79) in 2024 before shoulder labrum surgery wiped out that entire season. The Dodgers originally acquired him from Toronto in the 2022 Mitch White trade. Now fully healthy and working exclusively in relief, Frasso’s velocity has jumped from 94.6 mph in 2025 to 96.2 this year, his swinging-strike rate from 9.3% to 12.7%, and his chase rate from 24.5% to 33%. The 4.74 ERA is ugly, but a .407 BABIP and a 32.1% hard-hit rate suggest the damage has been more bad luck than bad pitching. He’s in his final minor league option year, meaning the Rockies will need to call him up and keep him or expose him to waivers in 2027.
Vidourek, 22, was the Dodgers’ third-round pick last summer out of the University of Cincinnati. He’s hitting .170 with a .332 OBP and a 38.7% swinging-strike rate in 256 Low-A plate appearances — contact issues so severe they border on existential. But the tools are undeniable: above-average raw power, plus speed, and a 70-grade throwing arm that Baseball America ranked as the best in the Dodgers’ entire system. At 6-foot-1 and 192 pounds, he’s playing center field now but projects as a right fielder as he fills out. If he can close the hole in his swing, the Rockies may have stolen a regular. If he can’t, the whiffs will eat him alive.
Rockies general manager Josh Byrnes — hired this past offseason after more than a decade in the Dodgers’ front office as senior vice president of baseball operations — knows both prospects intimately. That familiarity cuts both ways. The Dodgers wouldn’t have moved Frasso and Vidourek without confidence in what they’re getting. The Rockies wouldn’t have asked for them without confidence in what they’re losing.