The San Francisco Giants turned a necessary roster cut into a quiet addition of upside when they sent left-hander Reiver Sanmartin to the Washington Nationals for right-handed reliever Robert Cranz, the team announced.
Sanmartin, recently designated for assignment as the Giants cleared space after a season marked by a heavy injured list, brought a reliable ground-ball profile and major-league experience.
In return, San Francisco acquired a 23-year-old strikeout artist who profiles as near-ready depth for a bullpen that will need reinforcements in the coming years.
Cranz arrived in professional baseball as Washington’s seventh-round selection out of Oklahoma State in 2024.
Across his minor-league career he has already demonstrated a clear ability to miss bats, punching out more than 32 percent of the hitters he has faced and compiling 128 strikeouts in just 95⅔ innings.
That swing-and-miss skill showed up consistently at the lower levels.
In 2026, he recorded 27 strikeouts in 16 High-A innings with a 2.25 ERA, then followed with 40 punchouts in 26⅓ Double-A frames while posting a 3.42 ERA.
The mid-90s four-seam fastball, paired with a cutter and slider, gives him the raw stuff that modern bullpens covet.
His first exposure to Triple-A, however, exposed the other side of the ledger. In 11⅔ innings with Rochester, Cranz allowed 17 earned runs and walked more batters than he struck out.
Advanced hitters exploited his command issues, drawing walks at a high rate while his strikeout percentage dipped sharply.
Those struggles do not erase the underlying ability; they simply highlight the refinement still required.
For the Giants, the sample remains small enough that the organization can view the Triple-A results as a temporary setback rather than a definitive verdict.
From San Francisco’s perspective the exchange makes practical sense. Sanmartin, out of options and already removed from the 40-man roster, was unlikely to return much more than a claim or minor return on the waiver wire.
By trading him, the Giants extracted a young arm with genuine swing-and-miss traits and a path toward contributing as early as 2027 if his control improves.
Cranz is not a finished product, yet his age, velocity, and established strikeout history give the organization a developmental project that fits the profile of arms the Giants have sought to stockpile.
In a market where proven relievers command significant resources, acquiring a strikeout-oriented prospect in exchange for a recently designated veteran represents a low-risk way to add future bullpen flexibility.
