Players · J · Pitcher · 2026 regular season

Seth Johnson

Philadelphia Phillies National League East

Age: 28
B/T: R/R
Height: 6' 1"
Weight: 205 lb
Number: #52

Born: September 19, 1998 in Concord, NC, United States
MLB debut: September 8, 2024
Drafted: 2019, round CB-A
College: Campbell

Compare with…vs Caleb Ferguson vs Alan Rangel vs Bennett Sousa

dbWAR: -.1
IP: 33.2
ERA: 5.88
FIP: 4.62
K/9: 10.7
FIP−: 110

Seth Johnson is a relief pitcher for the Philadelphia Phillies. In 2026 he struck out 40 batters over 33.2 innings across 28 appearances, going 1-0. His ERA of 5.88 was 40.7% higher than the league average of 4.18 — 14th of 17 on his team, and 478th of 539 among MLB pitchers with 20+ innings. Stripping out defence, his 4.62 FIP suggests he pitched better than his ERA shows. He missed bats on 27.8% of swings (12.7% of every pitch he threw), walked 12.7% of the batters he faced and struck out 25.3%. 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, 2026 regular season.

FIP4.62

K/910.7

WHIP1.69

WAR.1

WAR by season

Pitching Regular season

Standard and advanced, by season. Regular-season games only.


2026	PHI/ATH	28	1	33.2	1	0	37	22	40	20	5.88	4.62	1.69	10.7	5.3	141	110	0.1
2025	PHI	10	0	12.2	1	1	11	6	17	4	4.26	4.48	1.18	12.1	2.8	103	108	0.0
2024	PHI	1	1	2.1	0	1	8	9	0	3	34.71	12.60	4.71	0.0	11.6	851	309	-0.2

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	71	63	18	2	8	14	.286	.366	.460	.365	19.7%
vs RHB	87	73	19	3	12	26	.260	.379	.466	.376	29.9%

Pitch sequencing

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

ShowBatter

Four-seamSliderSinkerCurveballSweeper

Select a count to see exactly what Seth Johnson throws in it.

Pitch arsenal

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

Season


Four-Seam Fastball	46.4%	281	97.7	2,380	46.6%	27.0%	59	.305	.962
Slider	33.7%	204	88.3	2,547	53.9%	31.3%	42	.286	.895
Sinker	9.3%	56	95.5	2,131	35.7%	11.1%	16	.250	.669
Curveball	5.3%	32	82.4	2,760	40.6%	50.0%	4	—	—
Sweeper	4.5%	27	84.8	2,730	37.0%	27.8%	15	.200	.467

Seth Johnson'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.

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Similar players

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

Bennett SousaHOU

ERA: 6.00
FIP: 4.94
SO: 32
WAR: -0.1

Very close

Caleb FergusonCIN

ERA: 5.18
FIP: 4.92
SO: 31
WAR: -0.1

Alan RangelPHI

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

Phil MatonCHC

ERA: 6.18
FIP: 5.49
SO: 31
WAR: -0.2

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.