Mason Montgomery Is Quietly Becoming Pittsburgh's Most Interesting Arm
Mason Montgomery is flashing a strikeout rate that demands attention. His 62.5% K rate over the last seven days represents a climb from an already impressive 55.0% over the trailing 30 days, and the underlying skills metrics suggest this isn't noise — it could be emerging as a legitimate profile shift.
WaiverScout Called This Early
We first flagged Montgomery back in April when he was rostered in just 0.2% of leagues. Through the spring and into early summer, the signal flickered — alternating between watch and deprioritize classifications as the sample remained thin and the role unclear. But since late July, ownership has surged from 3% to 4% to 7% and now sits at 13%, with the velocity of that climb accelerating. Managers who've been tracking our alerts since that initial April flag have watched this from the ground floor. The signal has only strengthened.
The Strikeout Surge
The headline number is the K rate: 62.5% over the last seven days. That's absurd for any pitcher in any role, and while we're working with a small sample across his recent appearances, the trend line from the 30-day mark (55.0%) to now tells a clear story — Montgomery is missing more bats as he settles into his usage pattern with Pittsburgh.
His recent game log backs it up. Over his last five appearances, Montgomery has racked up 11 strikeouts against hitters who have managed just a single hit. That 0-for-4 line on August 18 with two punchouts, the three-K outing on August 9, the three more on August 3 — he's been virtually unhittable.
The FIP tells the deeper story. At -1.25 relative to his ERA, Montgomery's run prevention skills are significantly better than his surface numbers suggest. When a pitcher's FIP runs that far below his ERA, it typically means regression — the good kind — is coming. The strikeouts are real, and the results should follow.
The Role Adds Value
What makes Montgomery particularly interesting is his versatility. Eligible at both SP and RP, he's carved out a role that Yahoo Sports describes as "Mr. Do-It-All" for the Pirates. CBS Sports notes he's already accumulated five saves in 2026, adding a category contribution you rarely get from a pitcher with this kind of strikeout upside.
At 13% rostered, Montgomery remains widely available despite the recent ownership spike. For context, comparable arms like Chase Burns, Braxton Ashcraft, and Kyle Harrison carry significantly higher ownership. Montgomery's dual eligibility and emerging dominance make him a value at current levels.
The Caveats
We need to be transparent about confidence here. This is still an early signal — the sample size is small, and we're missing rolling stat windows that would let us paint a fuller picture. The K rate is electric, but early signs suggest sustainability rather than confirm it. Worth monitoring closely over the next two weeks to see if the strikeout numbers hold as hitters get a second and third look.
Verdict: Watch
Mason Montgomery stays on the Watch list. The strikeout trajectory is real — 55.0% to 62.5% over the last month — the FIP supports better results ahead, and the saves add a secondary category boost that most waiver pitchers can't offer. He's not a blind add yet because the sample is still developing, but if you're in a league where he's available, you should be monitoring every appearance. The ownership arrow is pointing up fast, and the window to act before he hits 25-30% rostered is narrowing. WaiverScout has been tracking this signal since April. Don't sleep on it much longer.