Seth Johnson

Active

Athletics · RP

Age 286' 1" · 205 lbsThrows Right

#535 Preseason

FBaseball Overview

Johnson remains a depth pitcher in the Phillies' rotation with moderate strikeout upside but inconsistent results through his early MLB tenure. His 2026 start mirrors concerning trends from 2025—elevated ERA (4.82) and WHIP (1.39) suggest control issues despite respectable strikeout production (12 K in 9.1 IP). The young righthander offers limited wins and saves opportunities in a competitive rotation, making him most valuable in deep leagues or as a streaming option when facing weaker offenses. Managers should monitor his command development closely; if he can lower his ERA and WHIP, his K rate provides legitimate fantasy relevance, but current results indicate he's a bench arm rather than a dependable contributor.

News Updates

Seth Johnson undergoes knee surgery with Sacramento Athletics
Pitcher Seth Johnson underwent arthroscopic left knee surgery on Monday, according to MLB.com. The exact recovery timeline is not yet clear. This surgery could impact his availability for spring training and the start of next season.
Oct 6, 2026
Seth Johnson Recalled to Phillies Rotation
Philadelphia Phillies pitcher Seth Johnson was recalled from Triple-A Lehigh Valley on Thursday. The call-up provides pitching depth to a rotation affected by Brad Keller's season-ending injury. Johnson will compete for innings in Philadelphia's bullpen and rotation.
Jul 17, 2026

MLB Pitching

Year	Team	G	GS	W	L	ERA	WHIP	K	IP	BB
2024	Philadelphia Phillies	1	1	0	1	34.71	4.71	0	2.1	3
2025	Philadelphia Phillies	10	0	1	1	4.26	1.18	17	12.2	4
2026	2 teams▼	28	1	1	0	5.88	1.69	40	33.2	20
Career	Totals	39	2	2	2	6.84	1.71	57	48.2	27

Source: MLB Stats API · Multi-team seasons show combined totals — click to expand

Minor League Pitching

Year	Team	G	GS	W	L	SV	ERA	WHIP	K	IP	BB
2019	GCL Rays	5	5	0	0	0	0.00	0.90	7	10.0	2
2021	Charleston RiverDogs	23	16	6	6	0	2.88	1.27	115	93.2	33
2022	Bowling Green Hot Rods	7	7	1	1	0	3.00	1.26	41	27.0	11
2023	4 teams▼	5	5	0	1	0	4.35	1.35	14	10.1	5
2024	3 teams▼	20	20	0	7	0	2.72	1.31	70	72.2	36
2025	Lehigh Valley IronPigs	39	4	5	5	1	4.75	1.53	67	60.2	35
2026	2 teams▼	31	0	3	1	6	2.10	1.14	47	34.1	14
Career	Totals	135	62	17	22	7	3.07	1.30	380	331.2	150

Source: MLB Stats API · Multi-team seasons show combined totals — click to expand

Last Week / Last Month

Current season · MLB only

7 games

G	GS	IP	W-L	SV	ERA	WHIP	K	BB
7	1	12.2	0-0	0	3.55	1.18	14	3

30 games

G	GS	IP	W-L	SV	ERA	WHIP	K	BB
28	1	33.2	1-0	0	5.88	1.69	40	20

Game Log2026 MLB

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Advanced Stats2026 season · via Baseball Savant

Click for year to year changes

FB Velo97.4 mph

Avg Spin2442 rpm

Whiff %27.8%

K %25.3%

BB %12.7%

Hard Hit %44.2%

Barrel %11.6%

xERA4.69

xBA Against0.241

xSLG Against0.393

BA Against0.272

SLG Against0.463

What These Stats Mean

FB Velo — Average fastball velocity. Harder throwers generate more swings and misses, setting up every other pitch in their arsenal. Velocity is the foundation of strikeout upside.

Avg Spin — Average spin rate across all pitches. Higher spin creates more movement and makes pitches harder to square up — elite spinners run better strikeout and batting average against numbers.

Whiff % — Swings-and-misses per swing. The most direct measure of a pitcher's ability to miss bats and the best leading indicator of strikeout rate.

K % — Strikeout rate per batter faced. The core fantasy pitching stat — high K% means reliable strikeout totals that hold up even in shorter starts.

BB % — Walk rate per batter faced. The primary control metric. High BB% tanks ERA and WHIP and keeps baserunners on constantly. Elite starters typically run below 7%.

Hard Hit % — Percentage of batted balls hit 95 mph or harder against. Low hard-hit% means weak contact, protecting both ERA and the defense behind the pitcher.

Barrel % — Percentage of batted balls barreled against. The most direct home run predictor — low barrel% pitchers rarely give up long balls.

xERA — Expected ERA based on contact quality allowed, removing the effect of sequencing, luck, and defense. Better predictor of future ERA than ERA itself.

xBA Against — Expected batting average opponents should hit based on contact quality. A gap between xBA and actual BA indicates unsustainable luck in either direction.

xSLG Against — Expected slugging allowed based on contact quality. High xSLG against predicts future extra-base damage; low xSLG means the pitcher is genuinely suppressing power.

BA Against — Actual batting average opponents are hitting — a key WHIP component. Check xBA to see if the number is sustainable.

SLG Against — Actual slugging allowed. Captures hits, doubles, triples, and home runs — lower means the pitcher is limiting the power damage he gives up.

GB% — Ground ball rate. High GB% pitchers generate double plays, limit home runs, and keep the ball in the park — great for protecting ERA and WHIP ratios.

FB% — Fly ball rate. High FB% pitchers give up more air contact — dangerous when combined with high exit velocity, less so when contact is soft.

Loading player data...

Year

Team

ERA

WHIP

2024

Philadelphia Phillies

34.71

4.71

2.1

2025

Philadelphia Phillies

4.26

1.18

12.2

2026

2 teams▼

5.88

1.69

33.2

Career

Totals

6.84

1.71

48.2

Year

Team

ERA

WHIP

2019

GCL Rays

0.00

0.90

10.0

2021

Charleston RiverDogs

2.88

1.27

115

93.2

2022

Bowling Green Hot Rods

3.00

1.26

27.0

2023

4 teams▼

4.35

1.35

10.1

2024

3 teams▼

2.72

1.31

72.2

2025

Lehigh Valley IronPigs

4.75

1.53

60.2

2026

2 teams▼

2.10

1.14

34.1

Career

Totals

135

3.07

1.30

380

331.2

150

W-L

ERA

WHIP

12.2

0-0

3.55

1.18

W-L

ERA

WHIP

33.2

1-0

5.88

1.69