Relief Pitcher · Pittsburgh Pirates
Isaac Mattson
ERA
4.91
FIP
–
IP
36.2
W-L
0-0
WHIP
1.58
K%
20.5
BB%
10.8
GB%
–
K/9
8.3
HR/9
0.7
Drafted by the Los Angeles Angels in 2017 (round 19), he was signed by the Pittsburgh Pirates in free agency in November 2024. He made his MLB debut on May 7, 2021.Facts: MLB StatsAPI (people · transactions)
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Four-Seam Fastball
FF · lead pitch76% of pitches · .330 xwOBA allowed · 269 BIP · where it goes, what it costs
Pitcher Locations
where he throws it · catcher’s view
Rare 0% · Common 10% · Very common 20%+
xwOBA Allowed
damage done by zone · all batters
Cold .200 · Avg .310 · Hot .500+
Expected Damage
locations × damage zones
Low risk · Average · High-risk zone
Four-Seam Fastball (76% usage) has allowed .330 xwOBA over 269 balls in play — his most-used pitch.
Arsenal
usage × whiff, ranked6 pitch types · 1,547-pitch sample · 2026/2025/2024 blend, weighted 4/3/1
Whiff% Trend
last 8 outings · by pitch · min 5 swings per point
Four-Seam FastballChangeupSlider
Hand Splits
K% + xwOBA allowed by batter side · 2026/2025/2024 blend, weighted 4/3/1
| Split | K% | xwOBA | Sample |
|---|---|---|---|
| vs. LHB | 19.9 | .359 | 180 |
| vs. RHB | 23.1 | .287 | 188 |
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Market lines
current pick’em lines by book · updates through the day
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DFS picks
today’s picks for this pitcher, probability-sorted · graded nightly
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