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Relief Pitcher · Kansas City Royals

Mason Black

RHP · Throws Right · Age 26Reliever

ERA

4.31

FIP

–

31.1

W-L

0-0

WHIP

1.60

13.4

BB%

14.1

GB%

–

K/9

5.5

HR/9

1.7

Drafted by the San Francisco Giants in 2021 (round 3), he was acquired by the Kansas City Royals via trade from the San Francisco Giants in November 2025. He made his MLB debut on May 6, 2024.Facts: MLB StatsAPI (people · transactions)

No scheduled start today. The model projection and lineup matchup appear on start days.

Sinker

SI · lead pitch

27% of pitches · .423 xwOBA allowed · 91 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

Sinker (27% usage) has allowed .423 xwOBA over 91 balls in play — his most-used pitch.

Arsenal

usage × whiff, ranked

7 pitch types · 1,249-pitch sample · 2026/2025/2024 blend, weighted 4/3/1

Sinker SI

27% usage · 12% whiff · .423 xwOBA · 93.9 mph

Four-Seam Fastball FF

24% usage · 16% whiff · .363 xwOBA · 93.9 mph

Sweeper ST

23% usage · 17% whiff · .319 xwOBA · 82.9 mph

Slider SL

12% usage · 17% whiff · .344 xwOBA · 86.7 mph

Cutter FC

6% usage · 21% whiff · .603 xwOBA · 90.6 mph

Changeup CH

4% usage · .356 xwOBA

Curveball CU

3% usage · .316 xwOBA

Whiff% Trend

last 8 outings · by pitch · min 5 swings per point

SinkerFour-Seam FastballSweeper

Hand Splits

K% + xwOBA allowed by batter side · 2026/2025/2024 blend, weighted 4/3/1

Split	K%	xwOBA	Sample
vs. LHB	18.4	.397	138
vs. RHB	14.1	.358	178

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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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