DataBaseball
2026
John McMillon headshot

Pitcher · 2024

John McMillon

Age
26
B/T
L/R
Height
6' 3"
Weight
230 lb
Number
#92
Born
January 27, 1998 in Lufkin, TX, USA
MLB debut
August 17, 2023
Drafted
2019, round 11
College
Texas Tech
High school
Jasper
Salary, 2024
$740,000
dbWAR
.2
1 season(s)
IP
12.0
ERA
1.50
FIP
3.33
K/9
9.8
FIP−
82
100 = avg

John McMillon is a relief pitcher for the Miami Marlins. In 2024 he struck out 13 batters over 12.0 innings across 10 appearances, going 2-1. His ERA of 1.50 was 63.2% lower than the league average of 4.08. Stripping out defence, his 3.33 FIP suggests that his ERA had some help behind him. He missed bats on 37.5% of swings (16.7% of every pitch he threw), walked 10.6% of the batters he faced and struck out 27.7%. His 0.2 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, 2024.

FIP3.33
K/99.8
WHIP1.00
WAR.2

Platoon splits

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

Opponent batting by the side the hitter bats from, 2024. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
SplitPAABHHRBBSOAVGOBPSLGwOBAK%
vs LHB27245134.208.296.333.28614.8%
vs RHB20172029.118.211.118.16845.0%

Pitch sequencing

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

ShowBatter
SliderFour-seam

Select a count to see exactly what John McMillon throws in it.

Pitch arsenal

What he throws, how hard, and how often it misses in 2024.

Slider60.6%10985.32,24955.0%44.8%
Four-Seam Fastball38.9%7095.32,22437.1%18.2%
John McMillon'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.

Pitching

Standard and advanced, by season.

Trend
202410012.0210721351.503.331.009.83.837820.2

Head to head

Put John McMillon beside up to three others.

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John McMillon
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.