Pitcher · 2024

Tyler Duffey

Kansas City Royals American League Central

Age: 34
B/T: R/R
Height: 6' 3"
Weight: 220 lb
Number: #21

Born: December 27, 1990 in Houston, TX, USA
MLB debut: August 5, 2015
Drafted: 2012, round 5
College: Rice
High school: Bellaire

dbWAR: .1
IP: 9.0
ERA: 5.00
FIP: 3.94
K/9: 10.0
FIP−: 97

Tyler Duffey is a relief pitcher for the Kansas City Royals. In 2024 he struck out 10 batters over 9.0 innings across 9 appearances, going 1-0. His ERA of 5.00 was 22.6% higher than the league average of 4.08. Stripping out defence, his 3.94 FIP suggests he pitched better than his ERA shows. He missed bats on 23.9% of swings (9.0% of every pitch he threw), walked 19.0% of the batters he faced and struck out 23.8%. 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, 2024.

FIP3.94

K/910.0

WHIP1.67

WAR.1

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.
Split	PA	AB	H	HR	BB	SO	AVG	OBP	SLG	wOBA	K%
vs LHB	19	14	4	0	3	5	.286	.421	.500	.394	26.3%
vs RHB	23	18	3	0	5	5	.167	.348	.167	.271	21.7%

Pitch sequencing

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

ShowBatter

Knuckle curveFour-seamSliderSinkerChangeup

Select a count to see exactly what Tyler Duffey throws in it.

Pitch arsenal

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


Knuckle Curve	30.2%	57	80.7	2,535	47.4%	45.0%
Four-Seam Fastball	28.0%	53	90.8	2,345	47.2%	21.7%
Slider	17.5%	33	81.2	2,427	45.5%	8.3%
Sinker	16.4%	31	91.7	2,396	48.4%	9.1%
Changeup	7.9%	15	81.8	1,644	20.0%	20.0%

Tyler Duffey'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
2024	9	0	9.0	1	0	0	7	5	10	8	5.00	3.94	1.67	10.0	8.0	123	97	0.1	—

Head to head

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Tyler Duffey

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.