2025 Stats
W-L
1-0
ERA
2.03
WHIP
0.60
K
13
SV
0
Rest-of-Season Projections
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
The Pirates deployed a bullpen approach Monday, and Mattson was tasked with holding the lead in the seventh and eighth innings. He faced the top five hitters in the Brewers' order and allowed only a single to William Contreras. Mattson could be a candidate to see more consistent high-leverage spots moving forward, as he delivered a 9:2 K:BB across 10.1 innings while allowing only two earned runs with a 0.58 WHIP since being recalled June 7.
The Pirates deployed a bullpen approach Monday, and Mattson was tasked with holding the lead in the seventh and eighth innings. He faced the top five hitters in the Brewers' order and allowed only a single to William Contreras. Mattson could be a candidate to see more consistent high-leverage spots moving forward, as he delivered a 9:2 K:BB across 10.1 innings while allowing only two earned runs with a 0.58 WHIP since being recalled June 7.
Pitching Stats
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2025
2024
2021
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
18
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 2023
-81%
BAA vs RHP
2025
-100%
BAA vs RHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2023vs Left | .167 | 9 | 3 | 4 | 2 | |||
| Since 2023vs Right | .032 | 7 | 5 | 1 | 0 | |||
| 2025vs Left | .267 | 5 | 2 | 4 | 2 | |||
| 2025vs Right | .000 | 5 | 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 | |||
| More Splits→ | View More Split Stats | |||||||
Home/Away Pitching Splits
Since 2023
-48%
ERA on Road
2025
-70%
ERA at Home
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2023Home | 4.15 | 1.04 | 8.2 | 10.4 | 6.2 | ||||
| Since 2023Away | 2.16 | 0.48 | 8.1 | 6.5 | 2.2 | ||||
| 2025Home | 1.23 | 0.55 | 7.1 | 11.0 | 2.5 | ||||
| 2025Away | 4.15 | 0.69 | 4.1 | 2.1 | 2.1 | ||||
| 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 | ||||
| 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
4.33K/9
8.8BB/9
2.0HR/9
1.4Fastball
93.8 mphERA
2.03WHIP
0.60BABIP
.109GB/FB
0.56Left On Base
96.2%Exit Velocity
85.3 mphBarrels/BBE
6.0%Spin Rate
2163 rpmBalls Hit 95+ MPH
30.0%Swinging Strike
11.9%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
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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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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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.