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Relief Pitcher · Pittsburgh Pirates

Isaac Mattson

RHP · Throws Right · Age 31Reliever
ERA
5.35
FIP
–
IP
38.2
W-L
0-0
WHIP
1.60
K%
20.5
BB%
10.2
GB%
–
K/9
8.4
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)
No scheduled start today. The model projection and lineup matchup appear on start days.

Four-Seam Fastball

FF · lead pitch

75% of pitches · .328 xwOBA allowed · 273 BIP · where it goes, what it costs

Pitcher Locations
where he throws it · catcher’s view
4%5%6%2%1%5%9%11%6%2%5%10%14%8%3%0%1%2%2%1%0%1%2%1%1%
Rare 0% · Common 10% · Very common 20%+
xwOBA Allowed
damage done by zone · all batters
.601.292.364.438–.413.198.345.115.442.380.344.283.295.415–.400.505.380.707––.136–.689
Cold .200 · Avg .310 · Hot .500+
Expected Damage
locations × damage zones
.025.014.021.010–.022.017.038.006.009.019.034.038.023.012–.005.010.008.004––.002–.006
Low risk · Average · High-risk zone
Four-Seam Fastball (75% usage) has allowed .328 xwOBA over 273 balls in play — his most-used pitch.

Arsenal

usage × whiff, ranked

6 pitch types · 1,586-pitch sample · 2026/2025/2024 blend, weighted 4/3/1

Four-Seam Fastball FF
75% usage · 18% whiff · .328 xwOBA · 94.1 mph
Changeup CH
11% usage · 18% whiff · .329 xwOBA · 85.9 mph
Slider SL
9% usage · 29% whiff · .297 xwOBA · 84.3 mph
Curveball CU
3% usage · .351 xwOBA · 83.3 mph
Sweeper ST
2% usage · .358 xwOBA · 83.1 mph
Unknown UN
1% usage · .000 xwOBA
Whiff% Trend
last 8 outings · by pitch · min 5 swings per point
0102030407/57/87/117/127/187/198/179/5
Four-Seam FastballChangeupSlider
Hand Splits
K% + xwOBA allowed by batter side · 2026/2025/2024 blend, weighted 4/3/1
SplitK%xwOBASample
vs. LHB19.3 .365 185
vs. RHB23.6 .285 193
Live · client-hydrated

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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