DataBaseball
2026
J.C. Mejía headshot

Players · M · Pitcher · 2023

J.C. Mejía

Age
27
B/T
R/R
Height
6' 6"
Weight
250 lb
Number
#36
Born
August 26, 1996 in Gaspar Hernandez, Dominican Republic
MLB debut
May 21, 2021
dbWAR
-.7
4 season(s)
IP
11.1
ERA
5.56
FIP
4.31
K/9
10.3
FIP−
100
100 = avg

J.C. Mejía was a relief pitcher for the Milwaukee Brewers. In 2023 he struck out 13 batters over 11.1 innings across 9 appearances, going 1-0. His ERA of 5.56 was 28.3% higher than the league average of 4.33. Stripping out defence, his 4.31 FIP suggests he pitched better than his ERA shows. He missed bats on 26.8% of swings (12.1% of every pitch he threw), walked 6.0% of the batters he faced and struck out 26.0%. His 0.1 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, 2023.

FIP4.31
K/910.3
WHIP1.59
WAR.1

WAR by season

0.1-0.3-0.6212223

Pitching

Standard and advanced, by season.

Trend
2023MIL9011.11001571335.564.311.5910.32.41281000.1
2022MIL202.1000561523.148.684.293.919.3583219-0.1
2021CLE171152.1170604847248.256.151.618.14.1194144-0.6

Batting

Standard and advanced, by season.

Trend
2021CLE11000001.000.000.000.000—0.0%100.0%.000-0.3-122-0.0—

Platoon splits

How left- and right-handed hitters fare against him.

Opponent batting by the side the hitter bats from, 2023. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
SplitPAABHHRBBSOAVGOBPSLGwOBAK%
vs LHB23217116.333.391.476.38026.1%
vs RHB27258127.320.370.480.36925.9%

Pitch sequencing

What J.C. Mejía throws in each count, and what he follows each pitch with. Select any cell for the breakdown.

ShowBatter
SinkerSliderFour-seam

Select a count to see exactly what J.C. Mejía throws in it.

Pitch arsenal

What he throws, how hard, how often it misses, and what hitters do with it.

Sinker54.2%11695.82,09352.6%20.3%29.4141.072
Slider43.0%9285.32,53746.7%38.7%15.133.435
J.C. Mejía's arsenal by usage. Velocity is average release speed in mph, spin in rpm, and whiff rate is misses per swing — the cleanest single measure of whether a pitch beats hitters. BAA and OPS are what hitters did against each pitch, credited to the one that ended the plate appearance, and are left blank under 15 at-bats.

Head to head

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J.C. Mejía
How these are computed

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.