Players · B · Pitcher · 2026 regular season
Mason Black
- Age
- 27
- B/T
- R/R
- Height
- 6' 3"
- Weight
- 228 lb
- Number
- #47
- Born
- December 10, 1999 in Scranton, PA, United States
- MLB debut
- May 6, 2024
- Drafted
- 2021, round 3
- College
- Lehigh
- dbWAR
- -.9 Regular season, 3 season(s)
- IP
- 31.1
- ERA
- 4.31
- FIP
- 6.49
- K/9
- 5.5
- FIP−
- 155 100 = avg
Mason Black is a relief pitcher for the Kansas City Royals. In 2026 he struck out 19 batters over 31.1 innings across 17 appearances, going 0-0. His ERA of 4.31 was 3.0% higher than the league average of 4.18 — 11th of 19 on his team, and 313th of 539 among MLB pitchers with 20+ innings. Stripping out defence, his 6.49 FIP suggests that his ERA had some help behind him. He missed bats on 18.5% of swings (7.7% of every pitch he threw), walked 14.1% of the batters he faced and struck out 13.4%. His -0.6 dbWAR is built from that FIP rather than runs allowed, so it credits him for what he controls and not for the defence behind him.
League context
Percentile among qualified pitchers, 2026 regular season.
WAR by season
Pitching Regular season
Standard and advanced, by season. Regular-season games only.
Platoon splits
How left- and right-handed hitters fare against him.
| Split | PA | AB | H | HR | BB | SO | AVG | OBP | SLG | wOBA | K% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| vs LHB | 61 | 50 | 15 | 5 | 11 | 10 | .300 | .426 | .620 | .449 | 16.4% |
| vs RHB | 81 | 69 | 15 | 1 | 9 | 9 | .217 | .321 | .290 | .287 | 11.1% |
Pitch sequencing
What Mason Black throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Mason Black throws in it.
Pitch arsenal
What he throws, how hard, how often it misses, and what hitters do with it.
| Sinker | 144 | 93.8 | 2,091 | 45.8% | 18.6% | 32 | .219 | .708 | |
| Four-Seam Fastball | 118 | 94.0 | 2,138 | 41.5% | 15.7% | 21 | .286 | 1.117 | |
| Sweeper | 113 | 83.0 | 2,616 | 37.2% | 16.3% | 30 | .200 | .559 | |
| Slider | 78 | 86.9 | 2,353 | 44.9% | 23.5% | 17 | .235 | .690 | |
| Cutter | 43 | 90.5 | 2,161 | 34.9% | 23.1% | 5 | — | — | |
| Curveball | 37 | 81.1 | 2,545 | 48.6% | 16.7% | 8 | — | — | |
| Changeup | 23 | 87.9 | 1,310 | 34.8% | 25.0% | 6 | — | — |
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Similar players
Nearest 2026 seasons by command, run prevention and role, on rate statistics rather than totals.
wOBA uses linear weights measured from this season's own play-by-play rather than published constants, and wRC+ is park-adjusted against that same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page.