Players · P · Pitcher · 2026

Jack Perkins

Age: 27
B/T: R/R
Height: 6' 1"
Weight: 220 lb
Number: #50

Born: December 26, 1999 in Kokomo, IN, United States
MLB debut: June 22, 2025
Drafted: 2022, round 5
College: Indiana
High school: Kokomo

dbWAR: 1.2
IP: 116.0
ERA: 5.90
FIP: 4.58
K/9: 10.2
FIP−: 110

Jack Perkins is a relief pitcher for the Athletics. In 2026 he struck out 131 batters over 116.0 innings across 36 appearances, going 3-12. His ERA of 5.90 is 41.1% higher than the league average of 4.18 — 14th of 18 on his team, and 477th of 538 among MLB pitchers with 20+ innings. Stripping out defence, his 4.58 FIP suggests he pitched better than his ERA shows. He missed bats on 26.4% of swings (12.7% of every pitch he threw), walked 9.2% of the batters he faced and struck out 25.2%. His 0.8 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, 2026.

FIP4.58

K/910.2

WHIP1.45

WAR.8

WAR by season

Pitching

Standard and advanced, by season.

																				Trend
2026	ATH	36	16	116.0	3	12	3	120	76	131	48	5.90	4.58	1.45	10.2	3.7	141	110	0.8
2025	ATH	12	4	38.2	3	2	3	27	18	37	18	4.19	4.12	1.16	8.6	4.2	101	99	0.4

Platoon splits

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

Season

Opponent batting by the side the hitter bats from, 2026. 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	287	250	67	11	31	78	.268	.357	.448	.354	27.2%
vs RHB	232	207	53	9	17	53	.256	.328	.454	.342	22.8%

Pitch sequencing

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

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Four-seamSweeperChangeupCutterSinkerSliderUnknown

Select a count to see exactly what Jack Perkins throws in it.

Pitch arsenal

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

Season


Four-Seam Fastball	29.2%	587	95.7	2,238	47.9%	16.2%	125	.296	1.018
Sweeper	27.6%	553	86.2	2,771	55.3%	36.8%	127	.228	.674
Changeup	18.6%	374	89.5	1,183	42.5%	37.1%	101	.198	.473
Cutter	14.7%	295	92.6	2,467	46.1%	17.1%	57	.386	.981
Sinker	5.1%	103	94.8	2,265	37.9%	15.1%	29	.310	1.067
Slider	3.0%	60	86.1	2,768	41.7%	26.9%	14	—	—
Unknown	1.7%	35	—	—	51.4%	21.4%	4	—	—

Jack Perkins'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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Similar players

Nearest 2026 seasons by command, run prevention and role, on rate statistics rather than totals.

Griffin CanningSD

ERA: 5.57
FIP: 4.82
SO: 85
WAR: 0.0

Very close

Cristian JavierHOU

ERA: 5.14
FIP: 4.72
SO: 59
WAR: 0.2

Alan RangelPHI

ERA: 5.88
FIP: 4.60
SO: 29
WAR: 0.1

Kai-Wei TengHOU

ERA: 4.76
FIP: 4.76
SO: 73
WAR: 0.1

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.