2026 Stats
W-L
0-0
ERA
4.12
WHIP
1.47
K
15
SV
0
Rest-of-Season Projections
Signed a one-year contract with the Pirates in March of 2026.
Sent down to minors
Pittsburgh optioned Mattson to Triple-A Indianapolis on Wednesday.
Analysis
The 30-year-old will be sent back to Triple-A after posting a 4.12 ERA and 15 strikeouts in 19.2 innings for Pittsburgh on the season. The Pirates will replace Mattson in the bullpen with right-hander Wilber Dotel, who was recalled from Indianapolis.
The 30-year-old will be sent back to Triple-A after posting a 4.12 ERA and 15 strikeouts in 19.2 innings for Pittsburgh on the season. The Pirates will replace Mattson in the bullpen with right-hander Wilber Dotel, who was recalled from Indianapolis.
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
17
Last 10 Games
14
Last 5 Games
19
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
-23%
BAA vs RHP
2026
-8%
BAA vs LHP
| BAA | K | BB | H | HR | |
|---|---|---|---|---|---|
| Since 2024vs Left | .239 | 29 | 22 | 28 | 2 |
| Since 2024vs Right | .184 | 37 | 12 | 27 | 2 |
| 2026vs Left | .242 | 7 | 7 | 8 | 0 |
| 2026vs Right | .262 | 8 | 3 | 11 | 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 |
Home/Away Pitching Splits
Since 2024
-30%
ERA on Road
2026
-1%
ERA at Home
| ERA | WHIP | IP | K/9 | BB/9 | |
|---|---|---|---|---|---|
| Since 2024Home | 3.67 | 1.28 | 34.1 | 8.7 | 5.0 |
| Since 2024Away | 2.58 | 1.17 | 38.1 | 7.7 | 3.5 |
| 2026Home | 4.09 | 1.36 | 11.0 | 6.5 | 4.1 |
| 2026Away | 4.15 | 1.62 | 8.2 | 7.3 | 5.2 |
| 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 |
Minor League Left/Right Pitching Splits (AAA)
Since 2024
-5%
BAA vs RHP
2026
-50%
BAA vs RHP
| BAA | K | BB | H | HR | |
|---|---|---|---|---|---|
| Since 2024vs Left | .206 | 48 | 18 | 27 | 2 |
| Since 2024vs Right | .195 | 54 | 21 | 34 | 5 |
| 2026vs Left | .250 | 0 | 0 | 1 | 0 |
| 2026vs Right | .125 | 1 | 0 | 1 | 0 |
| 2025vs Left | .235 | 12 | 2 | 8 | 1 |
| 2025vs Right | .140 | 13 | 4 | 6 | 0 |
| 2024vs Left | .194 | 36 | 16 | 18 | 1 |
| 2024vs Right | .220 | 40 | 17 | 27 | 5 |
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
6.9BB/9
4.6HR/9
0.0Fastball
93.8 mphERA
4.12WHIP
1.47BABIP
.320GB/FB
0.54Left On Base
69.0%Exit Velocity
82.4 mphBarrels/BBE
5.9%Spin Rate
2301 rpmBalls Hit 95+ MPH
24.6%Swinging Strike
8.1%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
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
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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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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.