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Relief Pitcher · Pittsburgh Pirates

Isaac Mattson

RHP · Throws Right · Age 30Reliever

ERA

4.66

FIP

–

29.0

W-L

0-0

WHIP

1.41

19.8

BB%

10.3

GB%

–

K/9

7.8

HR/9

0.9

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 pitch

76% of pitches · .331 xwOBA allowed · 246 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 .331 xwOBA over 246 balls in play — his most-used pitch.

Arsenal

usage × whiff, ranked

6 pitch types · 1,419-pitch sample · 2026/2025/2024 blend, weighted 4/3/1

Four-Seam Fastball FF

76% usage · 18% whiff · .331 xwOBA · 93.9 mph

Changeup CH

11% usage · 19% whiff · .336 xwOBA · 85.9 mph

Slider SL

8% usage · 30% whiff · .298 xwOBA · 84.2 mph

Curveball CU

3% usage · .351 xwOBA · 83.3 mph

Sweeper ST

1% usage · .476 xwOBA

Unknown UN

1% usage · .000 xwOBA

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	19.7	.370	161
vs. RHB	23.5	.291	177

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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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