One pitch of his moves in a way hitters rarely see
Mattson's 4-seam fastball carries 17.7 inches of ride against a spinless ball, the biggest vertical move in his arsenal.
513 thrown, averaging 94.2 mph.
There is one pitch of his that keeps getting hit
Contact off Mattson's 4-seam fastball leaves the bat at 91.5 mph, against 84.6 off his changeup.
513 and 71 of them thrown.
He pitches around the zone once runners are on
Mattson throws 38.7% of his pitches in the zone with a runner in scoring position and 47% with the bases empty.
119 pitches with a runner in scoring position, 198 with the bases empty.
He throws about as hard as anybody in the league
Mattson averages 92.3 mph across his arsenal, 85th percentile in the league.
317 pitches in 2026. 85th percentile among qualified pitchers in 2026, 84th in MLB.
The contact he allows is the kind that finds grass
The quality of contact against Mattson projects a .390 average, 6th percentile.
317 pitches in 2026. 6th percentile among qualified pitchers in 2026, 504th in MLB.
His pitches move in ways that fit together
Mattson works with 4 pitches: 4-Seam Fastball, Slider, Changeup and Sweeper. The 4-seam fastball is 70.5% of everything he throws.
728 classified pitches in 2026.
When he falls behind, hitters know exactly what is coming
Behind in the count Mattson throws a fastball 78.3% of the time, against 65.8% when he is ahead.
184 pitches behind in the count, 225 ahead.
Too much of the contact against him is loud
49.1% of the contact Mattson gives up is hit hard, 14th percentile.
317 pitches in 2026. 14th percentile among qualified pitchers in 2026, 463rd in MLB.
He pitches differently depending on which hand is up
Mattson puts 45.6% of his pitches to right-handers in the zone and 42.1% of his pitches to left-handers.
158 pitches to right-handed hitters, 159 to left-handed hitters.
He saves one pitch for one side of the plate
Mattson throws the changeup 16.4% of the time against left-handers and 2.3% against right-handers.
344 pitches to right-handers, 384 to left-handers.
When hitters connect off him, they hit it hard
Hitters average 90.7 mph off the bat against Mattson, 20th percentile.
317 pitches in 2026. 20th percentile among qualified pitchers in 2026, 432nd in MLB.
He gets so far down the mound the ball arrives early
Mattson releases the ball 6.7 feet down the mound, so the ball arrives sooner than the radar gun suggests.
642 tracked pitches in 2026.
He lives on one side of the plate
Mattson works away from right-handers: his average pitch lands 1.6 inches to that side of the middle of the plate.
728 located pitches in 2026.
How much of the zone he uses depends on the count
Mattson puts 60.9% of his pitches in the zone when he is behind and 51.1% when he is ahead.
184 located pitches behind, 225 ahead.
One pitch of his runs sideways more than almost anyone's
Mattson's changeup moves 9.5 inches toward the third-base side, the biggest horizontal move in his arsenal.
71 thrown, averaging 86.0 mph.
His fastball is the pitch everything else is built on
Mattson's 4-seam fastball averages 94.2 mph, and has touched 97.2.
513 thrown, 70.5% of his pitches.
The gap between his pitches is what makes them work
9.6 mph separates Mattson's 4-seam fastball from his slider, 94.2 against 84.5.
513 and 79 of them respectively.
One pitch of his spins more than almost anyone's
Mattson's 4-seam fastball spins at 2,352 rpm, the highest in his arsenal.
513 thrown in 2026.
One pitch exists only to make the hitter think
Mattson has thrown 27 curveballs this season, 3.7% of his pitches, at 83.3 mph: a look rather than a weapon.
728 classified pitches in 2026.
Show more
The numbers behind these live in Pitch Data.
Take me there
One pitch of his moves in a way hitters rarely see
Mattson's 4-seam fastball carries 17.7 inches of ride against a spinless ball, the biggest vertical move in his arsenal.
513 thrown, averaging 94.2 mph.
One pitch of his runs sideways more than almost anyone's
Mattson's changeup moves 9.5 inches toward the third-base side, the biggest horizontal move in his arsenal.
71 thrown, averaging 86.0 mph.
The numbers behind these live in Pitch Data.
Take me there
There is one pitch of his that keeps getting hit
Contact off Mattson's 4-seam fastball leaves the bat at 91.5 mph, against 84.6 off his changeup.
513 and 71 of them thrown.
His pitches move in ways that fit together
Mattson works with 4 pitches: 4-Seam Fastball, Slider, Changeup and Sweeper. The 4-seam fastball is 70.5% of everything he throws.
728 classified pitches in 2026.
He saves one pitch for one side of the plate
Mattson throws the changeup 16.4% of the time against left-handers and 2.3% against right-handers.
344 pitches to right-handers, 384 to left-handers.
His fastball is the pitch everything else is built on
Mattson's 4-seam fastball averages 94.2 mph, and has touched 97.2.
513 thrown, 70.5% of his pitches.
The gap between his pitches is what makes them work
9.6 mph separates Mattson's 4-seam fastball from his slider, 94.2 against 84.5.
513 and 79 of them respectively.
One pitch of his spins more than almost anyone's
Mattson's 4-seam fastball spins at 2,352 rpm, the highest in his arsenal.
513 thrown in 2026.
One pitch exists only to make the hitter think
Mattson has thrown 27 curveballs this season, 3.7% of his pitches, at 83.3 mph: a look rather than a weapon.
728 classified pitches in 2026.
Show more
The numbers behind these live in Matchups.
Take me there
He pitches around the zone once runners are on
Mattson throws 38.7% of his pitches in the zone with a runner in scoring position and 47% with the bases empty.
119 pitches with a runner in scoring position, 198 with the bases empty.
The numbers behind these live in Pitch Data.
Take me there
He throws about as hard as anybody in the league
Mattson averages 92.3 mph across his arsenal, 85th percentile in the league.
317 pitches in 2026. 85th percentile among qualified pitchers in 2026, 84th in MLB.
The numbers behind these live in Spray Chart.
Take me there
The contact he allows is the kind that finds grass
The quality of contact against Mattson projects a .390 average, 6th percentile.
317 pitches in 2026. 6th percentile among qualified pitchers in 2026, 504th in MLB.
Too much of the contact against him is loud
49.1% of the contact Mattson gives up is hit hard, 14th percentile.
317 pitches in 2026. 14th percentile among qualified pitchers in 2026, 463rd in MLB.
When hitters connect off him, they hit it hard
Hitters average 90.7 mph off the bat against Mattson, 20th percentile.
317 pitches in 2026. 20th percentile among qualified pitchers in 2026, 432nd in MLB.
The numbers behind these live in Pitch Data.
Take me there
When he falls behind, hitters know exactly what is coming
Behind in the count Mattson throws a fastball 78.3% of the time, against 65.8% when he is ahead.
184 pitches behind in the count, 225 ahead.
How much of the zone he uses depends on the count
Mattson puts 60.9% of his pitches in the zone when he is behind and 51.1% when he is ahead.
184 located pitches behind, 225 ahead.
The numbers behind these live in Matchups.
Take me there
He pitches differently depending on which hand is up
Mattson puts 45.6% of his pitches to right-handers in the zone and 42.1% of his pitches to left-handers.
158 pitches to right-handed hitters, 159 to left-handed hitters.
The numbers behind these live in Pitch Data.
Take me there
He gets so far down the mound the ball arrives early
Mattson releases the ball 6.7 feet down the mound, so the ball arrives sooner than the radar gun suggests.
642 tracked pitches in 2026.
The numbers behind these live in Pitch Data.
Take me there
He lives on one side of the plate
Mattson works away from right-handers: his average pitch lands 1.6 inches to that side of the middle of the plate.
728 located pitches in 2026.
Pirates