Brewers outright Rob Zastryzny to Triple-A Nashville after DFA clears waivers

Rob Zastryzny cleared waivers and was outrighted to Triple-A Nashville on Sept. 21, completing a transaction that began four days earlier when the Milwaukee Brewers designated the left-hander for assignment, per the MiLB.com transaction log. The move, first reported by Todd Rosiak of the Milwaukee Journal Sentinel, ends Zastryzny's time on Milwaukee's 40-man roster — at least for now — after a season spent entirely on the 60-day injured list.

What happened

Per Rosiak's report, the Brewers designated Zastryzny on Sept. 17 while he was on a rehab assignment. Because Zastryzny is out of options, the club could not simply send him back to the minors without first exposing him to waivers. No team placed a claim, and the MiLB.com transaction log recorded the outright assignment to Nashville on Sept. 21.

Steve Adams of MLB Trade Rumors noted that the out-of-options status was the operative factor: without options remaining, returning Zastryzny to the bullpen was the only way to keep him on the 40-man, and the Brewers — sitting on the best record in baseball and managing a postseason roster with some care — apparently decided the math did not work in his favor at this moment.

Why it matters

The decision is less a verdict on Zastryzny's career than a reflection of where Milwaukee is right now. The Brewers have clinched the NL Central and, per a Sept. 18 report, are chasing a first-round bye with a shot at 100 wins. Roster construction at this stage of September is essentially postseason roster construction with extra steps, and a reliever working back from a nagging injury with a pronounced velocity decline is a difficult fit for a club that needs its bullpen arms ready to pitch meaningful October innings.

Adams described the stop-and-start nature of Zastryzny's rehab — four separate stints halted before the most recent one — and the velocity drop as "ominous factors" for a club in Milwaukee's position. That framing is worth sitting with: this is not a player who failed to perform when healthy. It is a player whose path back to health has been genuinely difficult to read.

The broader bullpen context adds texture. A week removed from the Zastryzny DFA, the Brewers recalled left-hander Colton Gordon from Triple-A Nashville and optioned right-hander Garrett Stallings on Sept. 18, per a separate report. Meanwhile, the club has been intentionally limiting Jacob Misiorowski to three innings per outing to manage his workload ahead of the postseason, per a Sept. 21 report. The picture that emerges is a front office actively shaping its late-season bullpen with October in mind — and Zastryzny, through no fault of his own, did not fit the shape they needed.

The numbers

The Zastryzny case is genuinely interesting from a numbers standpoint, because the career line and the current situation point in almost opposite directions.

From 2024 through last season, Zastryzny posted a 2.12 ERA across 29 2/3 innings with Milwaukee, with a 20.5% strikeout rate and a 9.5% walk rate, per Adams. Those rate figures are, as Adams noted, a bit worse than average — but not egregiously so. The ERA was excellent. Over his full major league career, spanning parts of seven seasons and 89 innings, he carries a 3.84 ERA. That is a solid number for a reliever who has never been a high-velocity, swing-and-miss weapon.

The velocity piece is where the current picture diverges sharply. Zastryzny sat at 92 mph during last year's strong showing. In Triple-A this year, working back from the trapezius strain, he has averaged 90.2 mph — a drop of nearly two miles per hour. He has posted a 3.27 ERA across 11 minor league innings, which is fine on its face, but Adams flagged the velocity decline alongside the rehab interruptions as the more meaningful signal. A soft-tossing left-hander who loses two ticks off an already modest fastball is operating with a thinner margin for error.

For context on the career arc: Zastryzny was a second-round pick by the Cubs in 2013 and has pitched in parts of 10 Triple-A campaigns, carrying a 4.69 ERA across 437 1/3 innings at that level. His 22 major league innings last season were a career high. The big-league opportunities have come in pieces across a long career, interrupted repeatedly by injuries and the organizational math that governs roster spots for relievers without premium velocity.

Where the club stands

The Brewers enter the week at 98-58 (.628), first in the NL Central and riding a three-game winning streak. The schedule turns to Philadelphia for a series at Citizens Bank Park, with Dustin May projected against Zack Wheeler on Tuesday, Sept. 22, and Logan Henderson projected against Aaron Nola on Wednesday, Sept. 23. Thursday's game at Citizens Bank Park is also on the docket.

A road series against the Phillies — themselves a postseason-bound club — is not a soft landing for a team managing workloads, but at 98 wins the Brewers have the luxury of keeping one eye on October without losing sight of the standings.

What we don't know yet

Whether another club considered claiming Zastryzny is not reported. Adams noted it was possible a team intrigued by his recent run with Milwaukee could have placed a speculative claim, but added that any claiming club would have needed to put him directly on a major league roster given his lack of options — a meaningful commitment for a reliever who has spent the full season nursing an injury and whose velocity remains below his recent baseline. He is controllable for three additional years via arbitration, per Adams, but the combination of the injury history, the velocity question, and the fact that he turns 35 next spring makes that a complicated calculation for any front office.

What Zastryzny's role in Nashville looks like from here, and whether the Brewers retain any interest in him going forward, is not addressed in the reporting.

What to watch

The outright assignment means Zastryzny can continue rehabbing in Nashville without the clock pressure of a 40-man roster spot. Whether he re-emerges as a candidate for a minor-league arrangement this offseason — the kind that keeps a veteran left-hander in an organizational ecosystem without a roster commitment — is the natural next question, though nothing in the current reporting addresses it.

For the Brewers, the more immediate watch item is how the bullpen takes shape over the final days of the regular season. With Misiorowski on a managed workload and the Gordon-Stallings swap still fresh, Milwaukee is clearly in the process of deciding which arms it wants sharp and available when the bracket is set. The Zastryzny outright is one data point in that larger exercise — a quiet transaction on a busy roster board, resolved without drama, as these things usually are.