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Mason Black

#47 - Relief Pitcher

Kansas City Royals

Bats / Throws Right / Right
Date of Birth 12/10/1999 (26)
Height, Weight 6'3", 228 lb
Hometown Scranton, PA

2026 Season Stats

MLB Rank MLB Average
Sv IP ERA WHIP K% BB%
0 11.1 2.38 1.50 24.0% 10.0%
160th 1
Sv
303rd 24.0
IP
30th 4.43
ERA
172nd 1.40
WHIP
125th 22.2%
K%
85th 10.4%
BB%
FB MPH SwStr% CSW% Str-ICR MTK% PLV PLA
94.2 11.0% 29.2% 48.3% 4.8% 5.04 3.51
152nd 94.3
FB MPH
198th 11.9%
SwStr%
184th 28.5%
CSW%
226th 50.4%
Str-ICR
191st 4.6%
MTK%
71st 4.93
PLV
122nd 3.50
PLA

Articles

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5/8/2026AL Central Top Prospects- May UpdateJacob Milham

See More Articles
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Mason Black Overview

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team G GS IP W-L Sv Hld ERA WHIP xERA FIP xFIP PLA K% BB% H/9 HR/9 BABIP HR/FB% LOB% ICR GB% SwStr% CSW% IPR PLV
2024 SF 9 8 36.1 1-5 0 0 6.44 1.68 5.76 5.47 5.05 3.87 18.3% 8.9% 11.4 1.73 .348 21.9% 70.1% 42.5% 35.8% 7.8% 25.9% 0.48 4.94
2025 SF 1 0 4.0 0-0 0 0 6.75 1.25 5.54 7.14 3.69 3.68 26.3% 0.0% 11.3 4.50 .250 40.0% 0.0% 35.7% 42.9% 10.8% 24.3% 0.54 4.96
2026 KC 9 0 11.1 0-0 0 0 2.38 1.50 4.56 3.73 4.45 3.51 24.0% 10.0% 9.5 0.79 .355 11.1% 90.4% 50.0% 28.1% 11.0% 29.2% 0.55 5.04
RP MLB Percentile 15 0 13 0-66 0 0 91 50 66 74 73 65 64 75 29 50 22 55 98 8 14 43 47 60 77
RP MLB AVG 19 1 24.0 1-1 1 3 4.43 1.40 4.32 4.31 4.36 3.50 22.2% 10.4% 8.5 1.08 .293 17.6% 71.8% 37.4% 43.6% 11.9% 28.5% 0.49 4.93
Career 19 8 51.2 1-5 0 0 5.57 1.61 5.48 5.20 4.80 3.78 20.2% 8.4% 11.0 1.74 .342 21.7% 72.6% 43.4% 34.9% 8.8% 26.5% 0.50 4.96

Mason Black Repertoire

2024 2025 2026 All
Hide MLB Percentile | Hide MLB Average

Mason Black Game Log

Mason Black Standard

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team G GS IP W-L QS Sv Hld P Strikes Balls TBF H 1B 2B 3B HR K BB HB WP
2024 SF 9 8 36.1 1-5 0 0 0 663 438 225 169 46 29 10 0 7 31 15 3 0
2025 SF 1 0 4.0 0-0 0 0 0 74 53 21 19 5 1 1 1 2 5 0 0 0
2026 KC 9 0 11.1 0-0 0 0 0 209 133 76 50 12 10 1 0 1 12 5 1 0
RP MLB Percentile 15 0 13 0-66 0 0 0 11 12 90 10 84 75 81 29 66 15 92 64 53
RP MLB AVG 19 1 24.0 1-1 0 1 3 402 255 148 103 22 14 4 0 3 23 10 1 1
Career 19 8 51.2 1-5 0 0 0 946 624 322 238 63 40 12 1 10 48 20 4 0

Mason Black Advanced

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team K% BB% AVG SLG OPS wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA xERA
2024 SF 18.3% 8.9% .309 .517 .898 .387 .348 .387 .272 .372 .294 .416 89.4 91.5 18.0 5.76
2025 SF 26.3% 0.0% .263 .737 1.000 .410 .250 .357 .247 .368 .211 .499 88.6 100.9 18.8 5.54
2026 KC 24.0% 10.0% .273 .364 .724 .331 .355 .375 .271 .338 .349 .396 90.9 87.6 22.7 4.56
RP MLB Percentile 64 75 31 54 56 53 22 26 32 66 15 47 24 90 7 66
RP MLB AVG 22.2% 10.4% .242 .391 .720 .320 .293 .322 .238 .323 .284 .365 87.9 89.4 13.2 4.32
Career 20.2% 8.4% .297 .505 .872 .381 .342 .382 .270 .368 .299 .424 89.6 91.8 19.0 5.48

Mason Black Pitch › Mix

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Year Team FF% (MPH) SI% (MPH) FC% (MPH) SL% (MPH) ST% (MPH) CB% (MPH) CH% (MPH) FS% (MPH) KN% (MPH) Fastball% Secondary%
2024 SF 32.1% (92.4) 28.5% (92.6) - 11.8% (87.9) 25.3% (81.2) - 2.3% (87.6) - - 60.6% 39.4%
2025 SF 43.2% (92.7) 16.2% (92.5) 6.8% (90.7) - 31.1% (81.8) - 2.7% (86.9) - - 59.5% 40.5%
2026 KC 19.1% (94.5) 26.3% (94.2) 7.2% (90.0) 10.5% (86.9) 31.6% (82.4) - 5.3% (88.4) - - 45.5% 54.5%
RP MLB Percentile 13 (48) 59 (51) 13 (54) 14 (59) 76 (47) - 11 (71) - - 32.6% 66.9%
RP MLB AVG 37.5% (94.3) 25.6% (93.9) 21.6% (89.4) 26.2% (85.4) 21.9% (82.5) 17.6% (79.8) 18.4% (86.2) 19.8% (86.5) 31.8% (68.1) 47.6% 52.2%
Career 30.1% (92.7) 27.1% (93.0) 2.1% (90.2) 10.6% (87.7) 27.2% (87.7) - 3.0% (87.8) - - 57.2% 42.8%

Mason Black Pitch › Results

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team FF CSW% SI CSW% FC CSW% SL CSW% ST CSW% CB CSW% CH CSW% FS CSW% KN CSW% Fastball CSW% Secondary CSW%
2024 SF 25.8% (26) 27.0% (7) - 24.4% (7) 26.8% (12) - 13.3% (0) - - 26.4% 25.3%
2025 SF 25.0% (3) 25.0% (0) 20.0% (1) - 26.1% (4) - 0.0% (0) - - 25.0% 23.3%
2026 KC 17.5% (5) 43.6% (7) 20.0% (1) 31.8% (3) 25.8% (5) - 27.3% (2) - - 32.6% 26.3%
RP MLB Percentile 7 (69) 97 (27) 19 (79) 63 (69) 34 (58) - 73 (68) - - 82.7% 24.1%
RP MLB AVG 26.9% (14) 27.4% (6) 27.1% (7) 29.3% (12) 28.2% (11) 27.0% (7) 21.8% (10) 24.4% (13) 23.3% (6) 27.9% 28.6%
Career 24.6% (34) 30.5% (14) 20.0% (2) 26.0% (10) 26.5% (21) - 17.9% (2) - - 27.4% 25.4%

Mason Black Batted Ball › Contact

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Year Team GB% LD% FB% PU% SS% Pull% Cent% Oppo% Foul Str% PC% Fl&B% Solid% Brl% ICR
2024 SF 35.8% 23.3% 26.7% 14.2% 38.3% 41.7% 37.5% 20.8% 22.0% 57.6% 26.7% 6.7% 9.2% 42.5%
2025 SF 42.9% 7.1% 35.7% 14.3% 35.7% 50.0% 28.6% 21.4% 28.4% 64.3% 7.1% 14.3% 14.3% 35.7%
2026 KC 28.1% 28.1% 28.1% 15.6% 40.6% 28.1% 40.6% 31.3% 19.1% 50.0% 34.4% 3.1% 12.5% 50.0%
RP MLB Percentile 14 24 55 90 22 2 80 93 75 9 9 75 15 8
RP MLB AVG 43.6% 21.8% 24.2% 10.3% 34.7% 41.4% 33.6% 25.1% 17.7% 62.3% 24.7% 5.9% 7.2% 37.4%
Career 34.9% 22.9% 27.7% 14.5% 38.6% 39.8% 37.3% 22.9% 21.9% 56.6% 26.5% 6.6% 10.2% 43.4%

Mason Black Batted Ball › Outcomes

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team AVG wOBA BABIP BACON xAVG xwOBA xBABIP xwoBACON EV FB EV LA HR/FB ICR IPA%
2024 SF .309 .387 .348 .387 .272 .372 .294 .416 89.4 91.5 18.0 21.9% 42.5% 30.2%
2025 SF .263 .410 .250 .357 .247 .368 .211 .499 88.6 100.9 18.8 40.0% 35.7% 26.3%
2026 KC .273 .331 .355 .375 .271 .338 .349 .396 90.9 87.6 22.7 11.1% 50.0% 32.0%
RP MLB Percentile 31 53 22 26 32 66 15 47 24 90 7 55 8 8
RP MLB AVG .242 .320 .293 .322 .238 .323 .284 .365 87.9 89.4 13.2 17.6% 37.4% 24.7%
Career .297 .381 .342 .382 .270 .368 .299 .424 89.6 91.8 19.0 21.7% 43.4% 30.3%

Mason Black Approach › Plate Discipline

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Year Team Zone% Str% Swing% O-Sw% Whiff% Foul Str% Con% Z-Con% O-Con% CS% SwStr% CSW% BIP% PLUS% IPR Str-ICR
2024 SF 47.4% 66.1% 48.0% 30.1% 16.4% 22.0% 83.6% 88.7% 73.3% 18.1% 7.8% 25.9% 18.1% 59.1% 0.48 50.7%
2025 SF 52.7% 71.6% 58.1% 37.1% 18.6% 28.4% 81.4% 86.7% 69.2% 13.5% 10.8% 24.3% 18.9% 64.9% 0.54 58.1%
2026 KC 46.4% 63.6% 45.5% 26.8% 24.2% 19.1% 75.8% 81.5% 63.3% 18.2% 11.0% 29.2% 15.3% 57.9% 0.55 48.3%
RP MLB Percentile 60 59 51 20 41 75 40 67 27 60 43 47 39 55 60 35
RP MLB AVG 44.4% 63.2% 46.7% 31.0% 25.5% 17.7% 74.5% 84.0% 58.5% 16.5% 11.9% 28.5% 17.0% 57.8% 0.49 50.4%
Career 47.6% 66.0% 48.2% 29.8% 18.2% 21.9% 81.8% 87.0% 70.9% 17.8% 8.8% 26.5% 17.5% 59.3% 0.50 50.7%

Mason Black Approach › Locations

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Year Team Zone% aLoc% x-mLoc% gLoc% hiLoc% y-mLoc% loLoc% iLoc% oLoc% mmLoc%
2024 SF 47.4% 28.1% 24.9% 47.1% 46.6% 25.0% 28.4% 28.4% 46.8% 5.7%
2025 SF 52.7% 21.6% 36.5% 41.9% 56.8% 21.6% 21.6% 31.1% 32.4% 12.2%
2026 KC 46.4% 32.1% 30.6% 37.3% 48.8% 21.5% 29.7% 35.4% 34.0% 6.7%
RP MLB Percentile 60 27 9 45 96 90 13 83 4 9
RP MLB AVG 44.4% 34.6% 26.9% 38.5% 36.2% 22.8% 41.0% 30.1% 43.0% 6.5%
Career 47.6% 28.4% 27.1% 44.5% 47.9% 24.0% 28.1% 30.1% 42.8% 6.4%

Mason Black Approach › Counts

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Year Team Early% Behind% 2-Str% Early BIP% F-Str% TF-Str% ECS% 2-Str O-Sw% PAR%
2024 SF 56.3% 11.2% 32.6% 15.3% 56.2% 46.7% 24.1% 26.9% 14.4%
2025 SF 60.8% 8.1% 31.1% 11.1% 68.4% 57.9% 17.8% 26.1% 21.7%
2026 KC 52.6% 14.8% 32.5% 15.5% 64.0% 52.0% 20.9% 26.5% 17.6%
RP MLB Percentile 4 46 87 73 83 61 58 48 37
RP MLB AVG 58.5% 12.6% 29.5% 14.3% 60.3% 49.7% 21.2% 26.2% 19.2%
Career 55.8% 11.7% 32.5% 15.0% 58.8% 48.7% 22.9% 26.7% 15.6%

Mason Black PLV

Hide 2026 MLB Percentile | Hide 2026 MLB Average
Year Team P PLV QP% AP% BP% Q-BP% MTK% HP HL PLA
2024 SF 663 4.94 46.6% 14.9% 38.5% 8.1% 6.8% 13.6 +13 3.87
2025 SF 74 4.96 41.9% 18.9% 39.2% 2.7% 10.8% 1.9 +0 3.68
2026 KC 209 5.04 48.8% 16.3% 34.9% 13.9% 4.8% 1.7 +0 3.51
RP MLB Percentile 11 77 85 35 74 74 44 47 41 65
RP MLB AVG 402 4.93 46.0% 17.0% 37.0% 9.1% 4.6% 0.6 +0 3.50
Career 946 4.96 46.7% 15.5% 37.7% 9.0% 6.7% 17.2 +14 3.78
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