DataBaseball
2026
Kyle Zimmer headshot

Pitcher · 2021

Kyle Zimmer

Age
30
B/T
R/R
Height
6' 3"
Weight
225 lb
Born
September 13, 1991 in San Francisco, CA, USA
MLB debut
March 31, 2019
dbWAR
.4
3 season(s)
IP
54.0
ERA
4.83
FIP
4.82
K/9
7.7
FIP−
113
100 = avg

Kyle Zimmer is a relief pitcher for the Kansas City Royals. In 2021 he struck out 46 batters over 54.0 innings across 52 appearances, going 4-1. His ERA of 4.83 was 13.3% higher than the league average of 4.27 — 10th of 19 on his team, and 386th of 567 among MLB pitchers with 20+ innings. Stripping out defence, his 4.82 FIP suggests the ERA was no fluke. He missed bats on 25.0% of swings (10.9% of every pitch he threw), walked 13.5% of the batters he faced and struck out 20.6%. 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, 2021.

FIP4.82
K/97.7
WHIP1.41
WAR-.1

Pitching

Standard and advanced, by season.

Trend
202152254.0412462946304.834.821.417.75.0113113-0.1
202016123.010014426101.572.371.0410.23.935530.6
201915018.10102822181910.805.782.568.89.3240128-0.2

Platoon splits

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

Opponent batting by the side the hitter bats from, 2021. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
SplitPAABHHRBBSOAVGOBPSLGwOBAK%
vs LHB96781411523.179.302.244.26024.0%
vs RHB1271113261523.288.370.505.37418.1%

Pitch sequencing

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

ShowBatter
Four-seamSliderCurveballChangeup

Select a count to see exactly what Kyle Zimmer throws in it.

Pitch arsenal

What he throws, how hard, and how often it misses in 2021.

Four-Seam Fastball50.4%47194.12,24944.4%16.6%
Slider36.8%34483.42,09946.2%33.5%
Curveball10.2%9577.81,99340.0%26.7%
Changeup2.2%2187.01,69828.6%12.5%
Kyle Zimmer'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.

Head to head

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Kyle Zimmer

Similar players

Nearest 2021 seasons by command, run prevention and role, on rate statistics rather than totals.

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.