2026 Stats
W-L
0-0
ERA
1.42
WHIP
1.42
K
9
SV
0
Rest-of-Season Projections
Signed a one-year contract with the Pirates in March of 2026.
Pitches scoreless inning in loss
Mattson allowed two hits while striking out two in one inning Monday in a 5-0 loss to the Padres.
Analysis
Mattson was a revelation out of the bullpen for the Pirates last season, posting a 2.45 ERA in 44 appearances after being called up in May. The right-hander has had a heavy workload so far this season, pitching in six out of Pittsburgh's 10 games and posting a 3.00 ERA and seven strikeouts. The Pittsburgh bullpen does not have many proven right-handers other than Dennis Santana, which means Mattson should continue appearing in many games this season.
Mattson was a revelation out of the bullpen for the Pirates last season, posting a 2.45 ERA in 44 appearances after being called up in May. The right-hander has had a heavy workload so far this season, pitching in six out of Pittsburgh's 10 games and posting a 3.00 ERA and seven strikeouts. The Pittsburgh bullpen does not have many proven right-handers other than Dennis Santana, which means Mattson should continue appearing in many games this season.
Pitching Stats
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2026 MLB Game Log
2026
2025
2024
2021
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
19
Last 10 Games
18
Last 5 Games
20
How many pitches does Isaac Mattson generally throw?
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
101-110
111-120
121+
What part of the game does Isaac Mattson generally pitch?
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2024
-21%
BAA vs RHP
2026
-36%
BAA vs LHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2024vs Left | .229 | 28 | 19 | 24 | 2 | |||
| Since 2024vs Right | .182 | 32 | 11 | 24 | 2 | |||
| 2026vs Left | .190 | 6 | 4 | 4 | 0 | |||
| 2026vs Right | .296 | 3 | 2 | 8 | 0 | |||
| 2025vs Left | .267 | 18 | 14 | 20 | 2 | |||
| 2025vs Right | .155 | 27 | 5 | 15 | 2 | |||
| 2024vs Left | .000 | 4 | 1 | 0 | 0 | |||
| 2024vs Right | .125 | 2 | 4 | 1 | 0 | |||
| More Splits→ | View More Split Stats | |||||||
Home/Away Pitching Splits
Since 2024
-16%
ERA on Road
2026
-100%
ERA at Home
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2024Home | 2.70 | 1.23 | 30.0 | 8.7 | 4.8 | ||||
| Since 2024Away | 2.27 | 1.15 | 35.2 | 7.8 | 3.5 | ||||
| 2026Home | 0.00 | 1.20 | 6.2 | 5.4 | 2.7 | ||||
| 2026Away | 3.00 | 1.67 | 6.0 | 7.5 | 6.0 | ||||
| 2025Home | 2.45 | 1.09 | 22.0 | 9.8 | 4.1 | ||||
| 2025Away | 2.45 | 1.17 | 25.2 | 7.4 | 3.2 | ||||
| 2024Home | 20.25 | 3.75 | 1.1 | 6.8 | 27.0 | ||||
| 2024Away | 0.00 | 0.25 | 4.0 | 11.3 | 2.3 | ||||
| More Splits→ | View More Split Stats | ||||||||
Stat Review
How does Isaac Mattson compare to other relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
K/BB
1.50K/9
6.4BB/9
4.3HR/9
0.0Fastball
93.7 mphERA
1.42WHIP
1.42BABIP
.310GB/FB
0.60Left On Base
88.9%Exit Velocity
81.8 mphBarrels/BBE
4.5%Spin Rate
2331 rpmBalls Hit 95+ MPH
23.9%Swinging Strike
7.3%Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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More Fantasy News
Picks up third win
Mattson (3-1) allowed two hits and struck out three across two scoreless innings to earn the win Wednesday against the Giants.
Analysis
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Solid in high-leverage spot
Mattson allowed one hit and struck out three across 1.2 scoreless innings to earn a hold Monday against the Brewers.
Analysis
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Recalled by Pittsburgh
The Pirates recalled Mattson from Triple-A Indianapolis on Saturday.
Analysis
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Optioned to Triple-A
The Pirates optioned Mattson to Triple-A Indianapolis on Monday, Noah Hiles of the Pittsburgh Post-Gazette reports.
Analysis
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Promoted Tuesday
The Pirates selected Mattson from Triple-A Indianapolis on Tuesday.
Analysis
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Latest Fantasy Rumors
Returning to big club?
Mattson has a locker in the Pirates' clubhouse ahead of Saturday's contest against the Phillies, Danny Demilio of PittsburghBaseballNow.com reports.
Analysis
Mattson appeared in three games for the Pirates and allowed a solo home run and one walk while striking out four batters across three innings before being optioned to Triple-A Indianapolis on May 26. He's spent most of the 2025 season in Triple-A, where he has a 2.42 ERA, 0.95 WHIP, four saves and a 27:6 K:BB across 22.1 innings. Joey Wentz's locker is not in Pittsburgh's clubhouse, and he may be the corresponding move to make room on the 26-man roster for Mattson, per Demilio.
Mattson appeared in three games for the Pirates and allowed a solo home run and one walk while striking out four batters across three innings before being optioned to Triple-A Indianapolis on May 26. He's spent most of the 2025 season in Triple-A, where he has a 2.42 ERA, 0.95 WHIP, four saves and a 27:6 K:BB across 22.1 innings. Joey Wentz's locker is not in Pittsburgh's clubhouse, and he may be the corresponding move to make room on the 26-man roster for Mattson, per Demilio.