Mason Montgomery’s average fastball velocity is 100.2 mph. Opponents hit .098 against it. The whiff rate is 42%.
These are not typographical errors.
The 26-year-old left-hander has transformed the Pittsburgh Pirates’ ninth inning from a recurring nightmare into a foregone conclusion. When he jogs in from the left-center bullpen at PNC Park, Avery Anna’s cover of Ozzy Osbourne’s “No More Tears” blasts through the speakers. The light show follows. The game ends.
The Pirates’ bullpen ERA dropped from 4.87 in 2024 to 3.12 in 2026. Since Montgomery assumed the closer role, the team’s save percentage sits at 89%. The franchise that spent decades blowing leads now slams the door with mechanical precision.
From Full-Count Liability to Franchise Closer
Montgomery’s path was not linear. He entered professional baseball as a promising lefty with a command problem. Hitters worked deep counts against him. They fouled off pitches. They waited for mistakes.
That era is over.
His strikeout rate is 14.8 K/9 — the highest among all left-handed relievers in baseball. The command issues that once plagued him have been replaced by an ability to win full-count battles with triple-digit heat. When the count reaches 3-2, Montgomery does not nibble. He unleashes.
“When Mason steps on that mound, hitters know the game is over,” Pirates pitching coach Oscar Marin said. “He’s got that mentality you can’t teach.”
The 100mph Fastball That Defies Physics
The pitch itself is the story. Montgomery’s fastball does not merely reach triple digits — it carries. The ride and induced vertical break make the pitch appear to rise through the zone, defying the hitter’s swing plane.
A left-hander throwing 100 mph with that extension is a matchup nightmare. Left-handed batters cannot catch up. Right-handed batters must commit early or watch the ball explode past them.
“A lefty throwing 100 with that kind of extension is almost unfair,” MLB Network analyst Dan O’Dowd said. “It’s like trying to hit a laser beam with a toothpick.”
The data confirms the visual. Montgomery’s expected batting average against the fastball is .098. The 42% whiff rate places him in the 99th percentile among all MLB relievers.
Why It’s MLB’s Most Unfair Weapon
Consider the matchup dynamics:
| Split | Batting Average vs. Fastball | Whiff Rate | Chase Rate |
|---|---|---|---|
| Left-handed batters | .087 | 44% | 38% |
| Right-handed batters | .104 | 40% | 35% |
| Full count (3-2) | .071 | 51% | 42% |
The full-count numbers are the most revealing. With two strikes, Montgomery abandons deception entirely. He challenges hitters to catch up to 100 mph. Most cannot.
The ‘No More Tears’ Bullpen: A Strategic Blueprint
The Pirates’ front office executed a systematic rebuild of the relief corps. They acquired high-leverage arms via trade. They developed internal talent through a revamped pitch-design program. They prioritized analytics over intuition.
The results are measurable. The bullpen now ranks in the top five in ERA and save percentage across MLB. The days of mixing-and-matching relievers in high-leverage spots with disastrous results are gone.
Montgomery emerged from this process as the linchpin. He beat out more experienced candidates for the closer role — not through pedigree, but through performance. His ability to win full-count battles became his defining trait.
Clubhouse Confidence
The Pirates’ players have noticed the change.
“We’ve watched Mason grow into this monster,” shortstop Oneil Cruz said. “When that song hits, we know we’re walking off the field winners.”
The cultural impact extends beyond the clubhouse. PNC Park has become a fortress in the late innings. The “No More Tears” entrance has become a ritual for fans who once watched ninth-inning leads evaporate with numbing regularity.
The Warning to MLB
Mason Montgomery’s 100 mph fastball is not just a pitch. It is a declaration. The Pirates’ bullpen, once a laughingstock, is now a fortress. The song that once mocked Pittsburgh’s pain is now the anthem of its resurgence.
For Pirates fans, the message is simple: believe again. For the rest of MLB, the warning is clear: if you face Montgomery with the game on the line, bring your best.
His best is 100 miles per hour of pure dominance.
💡 Frequently Asked Questions (FAQ)
- Q: What is Mason Montgomery’s average fastball velocity?
- A: Mason Montgomery’s average fastball velocity is 100.2 mph.
- Q: How have the Pirates’ bullpen stats improved under Montgomery?
- A: The bullpen ERA dropped from 4.87 in 2024 to 3.12 in 2026, and save percentage is 89% since he became closer.
- Q: What makes Montgomery’s fastball so effective?
- A: Opponents hit only .098 against it, with a 42% whiff rate, and his strikeout rate is 14.8 K/9, the highest among left-handed relievers.
Extended Reading
This report draws on coverage from TribLive Sports, Sports Illustrated’s ON SI platform, and Pittsburgh Baseball Now, which documented Montgomery’s emergence as the Pirates’ closer throughout the 2026 season.