Seattle Mariners#68 · SP

George Kirby

Age 28

Contract Value $6,550,000/yr

Size 6' 4" · 215

Throws RHP

Bats Right

From Rye, NY

9–11

W-L

4.33

ERA

1.40

WHIP

148

174.2

54P-ScoreAVERAGE

Strong workload with form still trailing the rest of the profile. He ranks 80th among 226 qualified starters.

How P-Score works

Stats updated Oct 23, 1:03 PM ETLast game Sep 16 at LAA

Season overview

ERA

4.33125th

WHIP

1.40155th

K/9

7.6136th

BB/9

2.445th

FIP

3.8568th

HR/9

1.198th

IP/start

5.9

WAR

2.546th

How good is he?

StatPlayerMLB AvgPercentile

Run Prevention4850

BELOW AVG

Skill5650

AVERAGE

Workload6650

ABOVE AVG

Consistency5950

AVERAGE

Form4250

BELOW AVG

Contact Management5750

AVERAGE

Recent form

Last 5 starts

ERA

4.554.33

▲ 0.22

K/9

7.97.6

▲ 0.3

BB/9

3.32.4

▲ 0.9

IP/start

5.95.9

— 0.0

Pitches/start

9492

▲ 2

·Completed six innings in three of five starts.

·Walk rate rose from 2.4 to 3.3 BB/9.

Game log

Last 10 starts · bar = innings completed

Sep 16

at Los Angeles Angels

4.1 IP · 93 pitches

2 ER5 H · 5 K

Sep 11

at Athletics

6.0 IP · 101 pitches

4 ER9 H · 5 K

Sep 5

vs Athletics

6.2 IP · 100 pitches · QS

3 ER7 H · 5 K

Aug 31

at Boston Red Sox

5.0 IP · 86 pitches

5 ER7 H · 2 K

Aug 25

vs Philadelphia Phillies

7.2 IP · 92 pitches · QS

1 ER6 H · 9 K

Aug 20

at Milwaukee Brewers

3.1 IP · 84 pitches

6 ER9 H · 3 K

Aug 14

at Houston Astros

4.2 IP · 99 pitches

5 ER8 H · 2 K

Aug 8

vs Tampa Bay Rays

5.0 IP · 99 pitches

1 ER4 H · 2 K

Aug 2

vs Minnesota Twins

7.0 IP · 94 pitches · QS

0 ER5 H · 3 K

Jul 27

at Texas Rangers

4.0 IP · 66 pitches

7 ER7 H · 3 K

Pitch arsenal (2026)

Usage %Velocity

Sweeper28.3%87.4 mph
Four-seam FB28.2%96.7 mph
Sinker21.0%96.8 mph
Knuckle Curve10.3%84.1 mph
Changeup5.4%88.8 mph
Cutter4.4%92.9 mph
Splitter2.4%87.2 mph

Hot / cold zones (vs RHB)

.222.338.170.345.376.348.357.259.420

Better than MLB avg
Similar to MLB avg
Worse than MLB avg

Monthly ERA (2026)

Minimum 1 GS

Splits

Home / away

Home (15 GS)

3.27

WHIP 1.14

Away (14 GS)

5.45

WHIP 1.68

2.18 ERA better at home

vs handedness

vs LHH

.810

vs RHH

.736

.074 OPS better vs RHH

By monthERA · IP · K

September4.7617.015

August4.9632.221

July5.0616.016

June3.9030.032

May4.9729.025

April3.2339.028

March1.506.06

Rest daysERA · WHIP · K/9

5 days (7 GS)3.821.559.0

6+ days (21 GS)4.511.377.1

Sample sizes below four starts are not shown

Career

YearTeamW-LERAIPKWHIPFIPWAR

2026SEA9–114.33174.21481.403.852.5

202510–84.21126.01371.193.16

202414–113.53191.01791.073.08

202313–103.35190.21721.043.10

20228–53.39130.01331.212.86

Career5 yrs54–453.74812.17691.173.232.5

Frequently asked

What is George Kirby's ERA in 2026?+

4.33 across 30 starts and 174.2 innings, with a 1.40 WHIP and a 3.85 FIP. That ERA ranks 125th among qualified starters.

When is his next start?+

No probable start has been announced.

What pitches does he throw?+

He throws sweeper (28.3% at 87.4 mph mph), four-seam fb (28.2% at 96.7 mph mph), sinker (21.0% at 96.8 mph mph), knuckle curve (10.3% at 84.1 mph mph), changeup (5.4% at 88.8 mph mph), cutter (4.4% at 92.9 mph mph), splitter (2.4% at 87.2 mph mph).

What is his P-Score?+

54 out of 100, which we label average — 80th among 226 qualified starters.

How has he pitched in his last 5 starts?+

A 4.55 ERA, 7.9 K/9, 3.3 BB/9.