DataBaseball
2026
Junior Fernández headshot

Players · F · Pitcher · 2022

Junior Fernández

Age
25
B/T
R/R
Height
6' 3"
Weight
215 lb
Born
March 2, 1997 in Santo Domingo Centro, Dominican Republic
MLB debut
August 11, 2019
dbWAR
-.6
5 season(s)
IP
18.2
ERA
2.41
FIP
5.79
K/9
6.8
FIP−
146
100 = avg

Junior Fernández was a relief pitcher for the St. Louis Cardinals. In 2022 he struck out 14 batters over 18.2 innings across 16 appearances, going 0-0. His ERA of 2.41 was 39.3% lower than the league average of 3.97. Stripping out defence, his 5.79 FIP suggests that his ERA had some help behind him. He missed bats on 26.7% of swings (12.0% of every pitch he threw), walked 14.3% of the batters he faced and struck out 16.7%. His -0.3 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, 2022.

FIP5.79
K/96.8
WHIP1.61
WAR-.3

WAR by season

0.0-0.2-0.319202122

Pitching

Standard and advanced, by season.

Trend
2022STL/PIT16018.200018514122.415.791.616.85.861146-0.3
2021STL18020.2100251315155.665.151.946.56.5133121-0.1
2020STL303.0000662218.008.192.676.06.0404184-0.1
2019STL13011.2010971665.405.271.2912.34.6120117-0.0

Batting

Standard and advanced, by season.

Trend
2021STL11000001.000.000.000.000—0.0%100.0%.000-0.3-127-0.0—

Platoon splits

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

Opponent batting by the side the hitter bats from, 2022. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
SplitPAABHHRBBSOAVGOBPSLGwOBAK%
vs LHB23174063.235.435.235.33813.0%
vs RHB6153143611.264.350.472.36118.0%

Pitch sequencing

What Junior Fernández throws in each count, and what he follows each pitch with. Select any cell for the breakdown.

ShowBatter
SinkerSliderFour-seamChangeup

Select a count to see exactly what Junior Fernández throws in it.

Pitch arsenal

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

Sinker41.4%13898.72,05140.6%15.6%40.275.820
Slider35.1%11788.92,11942.7%44.0%23.304.886
Four-Seam Fastball13.2%4498.82,21170.5%14.8%5——
Changeup10.2%3490.91,86323.5%44.4%2——
Junior Fernández'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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Junior Fernández
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.