2025 Stats
W-L
0-0
ERA
3.00
WHIP
0.67
K
4
SV
0
Rest-of-Season Projections
Optioned to Triple-A
The Pirates optioned Mattson to Triple-A Indianapolis on Monday, Noah Hiles of the Pittsburgh Post-Gazette reports.
ANALYSIS
The move makes room on the 26-man roster for Braxton Ashcraft, who was recalled from Triple-A on Monday. Mattson appeared in three major-league games for the Pirates since being promoted to the majors this past Tuesday and allowed one run on one hit and one walk while striking out four across three innings. He'll head back to Triple-A, where he has a 2.33 ERA, 0.94 WHIP, four saves and a 24:5 K:BB across 19.1 innings.
The move makes room on the 26-man roster for Braxton Ashcraft, who was recalled from Triple-A on Monday. Mattson appeared in three major-league games for the Pirates since being promoted to the majors this past Tuesday and allowed one run on one hit and one walk while striking out four across three innings. He'll head back to Triple-A, where he has a 2.33 ERA, 0.94 WHIP, four saves and a 24:5 K:BB across 19.1 innings.
Pitching Stats
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2025
2024
2021
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
16
Last 10 Games
16
Last 5 Games
16
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 2023
-8%
BAA vs RHP
2025
-100%
BAA vs RHP
| BAA | K | BB | H | HR | |
|---|---|---|---|---|---|
| Since 2023vs Left | .077 | 7 | 1 | 1 | 1 |
| Since 2023vs Right | .071 | 3 | 5 | 1 | 0 |
| 2025vs Left | .250 | 3 | 0 | 1 | 1 |
| 2025vs Right | .000 | 1 | 1 | 0 | 0 |
| 2024vs Left | .000 | 4 | 1 | 0 | 0 |
| 2024vs Right | .125 | 2 | 4 | 1 | 0 |
| 2023vs Left | 0 | 0 | 0 | 0 | 0 |
| 2023vs Right | 0 | 0 | 0 | 0 | 0 |
Home/Away Pitching Splits
Since 2023
-100%
ERA on Road
2025
-100%
ERA on Road
| ERA | WHIP | IP | K/9 | BB/9 | |
|---|---|---|---|---|---|
| Since 2023Home | 8.31 | 1.62 | 4.1 | 10.4 | 10.4 |
| Since 2023Away | 0.00 | 0.25 | 4.0 | 11.3 | 2.3 |
| 2025Home | 3.00 | 0.67 | 3.0 | 12.0 | 3.0 |
| 2025Away | 0 | 0 | 0 | 0 | 0 |
| 2024Home | 20.25 | 3.75 | 1.1 | 6.8 | 27.0 |
| 2024Away | 0.00 | 0.25 | 4.0 | 11.3 | 2.3 |
| 2023Home | 0 | 0 | 0 | 0 | 0 |
| 2023Away | 0 | 0 | 0 | 0 | 0 |
Minor League Left/Right Pitching Splits (AAA)
Since 2023
-5%
BAA vs RHP
2025
-46%
BAA vs RHP
| BAA | K | BB | H | HR | |
|---|---|---|---|---|---|
| Since 2023vs Left | .210 | 48 | 18 | 26 | 2 |
| Since 2023vs Right | .199 | 53 | 21 | 33 | 5 |
| 2025vs Left | .258 | 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 |
| 2023vs Left | 0 | 0 | 0 | 0 | 0 |
| 2023vs Right | 0 | 0 | 0 | 0 | 0 |
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
4.00K/9
12.0BB/9
3.0HR/9
3.0Fastball
92.1 mphERA
3.00WHIP
0.67BABIP
.000GB/FB
0.20Left On Base
166.7%Exit Velocity
86.5 mphBarrels/BBE
20.0%Spin Rate
2060 rpmBalls Hit 95+ MPH
30.0%Swinging Strike
14.9%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
Promoted Tuesday
The Pirates selected Mattson from Triple-A Indianapolis on Tuesday.
ANALYSIS
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Returns to Pittsburgh
Mattson signed a minor-league contract with the Pirates on Thursday, Noah Hiles of the Pittsburgh Post-Gazette reports.
ANALYSIS
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Removed from 40-man roster
The Pirates outrighted Mattson to Triple-A Indianapolis on Monday, Andrew Destin of the Pittsburgh Post-Gazette reports.
ANALYSIS
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Selected from Triple-A
The Pirates selected Mattson was selected from Triple-A Indianapolis on Thursday, Noah Hiles of the Pittsburgh Post-Gazette reports.
ANALYSIS
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Heads to Pirates on MiLB deal
Mattson signed a minor-league contract with the Pirates on Dec. 11.
ANALYSIS
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Latest Fantasy Rumors
Joining MLB roster?
Mattson has a locker in the Pirates clubhouse ahead of Tuesday's game versus the Reds, reports Noah Hiles of the Pittsburgh Post-Gazette.
ANALYSIS
The right-hander re-signed with the Pirates on a minor-league contract in December, and it appears he'll be added to the MLB roster Tuesday. Mattson has a 2.33 ERA, 0.94 WHIP and 24:5 K:BB across 19.1 innings for Triple-A Indianapolis this year.
The right-hander re-signed with the Pirates on a minor-league contract in December, and it appears he'll be added to the MLB roster Tuesday. Mattson has a 2.33 ERA, 0.94 WHIP and 24:5 K:BB across 19.1 innings for Triple-A Indianapolis this year.