15-Day IL
Injury Shoulder
Est. Return 5/2/2025
2025 Stats
W-L
0-0
ERA
0.00
WHIP
0.00
K
0
SV
0
Rest-of-Season Projections
2025 Fantasy Outlook
For the second straight year, Kirby had the lowest walk rate among qualified starters. He got off to a rocky start with an eight-run blowup in his second outing of the year and a 4.33 ERA through his first 11 starts. However, Kirby then turned in nine consecutive quality starts from June 9 to July 26. Water usually finds its level, and Kirby's 3.53 ERA at the end of the year was pretty much right in line with the underlying skills (3.58 xFIP, 3.56 SIERA). He's reached 190 innings in back-to-back seasons, but that is likely out of reach for 2025 given Kirby will start the year on the year with a shoulder issue. The other problem is that he still has not shown any growth with his strikeout rate, which has hovered right around 23 percent in each of his three seasons in the majors so far. It's not out of the question that the right pitch-mix tweak could unlock another level with the punchouts, but that's purely conjecture at this point. Read Past Outlooks

Throws off mound, May return likely
Mariners general manager Justin Hollander said Monday that Kirby (shoulder) "felt great" while throwing a bullpen session over the weekend, Daniel Kramer of MLB.com reports.
ANALYSIS
Kirby is set to throw two more bullpen sessions this week before beginning a game progression. While Hollander wouldn't divulge a timetable for when the right-hander will be ready for his season debut, signs are pointing to it being sometime in May. Kirby was diagnosed with right shoulder inflammation back on March 7 but has made steady progress since then.
Kirby is set to throw two more bullpen sessions this week before beginning a game progression. While Hollander wouldn't divulge a timetable for when the right-hander will be ready for his season debut, signs are pointing to it being sometime in May. Kirby was diagnosed with right shoulder inflammation back on March 7 but has made steady progress since then.
Pitching Stats
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2025
2024
2023
2022
2020
Minor League Game Log

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Left/Right Pitching Splits
Since 2023
-4%
BAA vs RHP
2025
No Stats
BAA | K | BB | H | HR | ||||
---|---|---|---|---|---|---|---|---|
Since 2023vs Left | .251 | 170 | 26 | 169 | 22 | |||
Since 2023vs Right | .240 | 181 | 16 | 191 | 22 | |||
2025vs Left | 0 | 0 | 0 | 0 | 0 | |||
2025vs Right | 0 | 0 | 0 | 0 | 0 | |||
2024vs Left | .257 | 88 | 15 | 86 | 12 | |||
2024vs Right | .234 | 91 | 8 | 95 | 10 | |||
2023vs Left | .246 | 82 | 11 | 83 | 10 | |||
2023vs Right | .247 | 90 | 8 | 96 | 12 | |||
More Splits→ | View More Split Stats |
Home/Away Pitching Splits
Since 2023
-27%
ERA at Home
2025
No Stats
ERA | WHIP | IP | K/9 | BB/9 | |||||
---|---|---|---|---|---|---|---|---|---|
Since 2023Home | 2.87 | 0.94 | 175.2 | 9.2 | 1.0 | ||||
Since 2023Away | 3.93 | 1.15 | 206.0 | 7.5 | 1.0 | ||||
2025Home | 0 | 0 | 0 | 0 | 0 | ||||
2025Away | 0 | 0 | 0 | 0 | 0 | ||||
2024Home | 3.06 | 1.01 | 82.1 | 9.2 | 1.1 | ||||
2024Away | 3.89 | 1.11 | 108.2 | 7.9 | 1.1 | ||||
2023Home | 2.70 | 0.89 | 93.1 | 9.3 | 1.0 | ||||
2023Away | 3.98 | 1.18 | 97.1 | 7.0 | 0.8 | ||||
More Splits→ | View More Split Stats |
Prospect Rankings History
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Defensive Stats
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Stats Vs Today's Lineup
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With supposed paragon of durability George Kirby opening the year on the injured list, it's time to ask whether or not we really have any idea about which pitchers are injury-prone.
Past Fantasy Outlooks
2024
2023
2022
2021
2020
After being highly touted as a prospect, Kirby showed great promise in his debut season in 2022. The right-hander took his game to another level in his sophomore campaign, shaving his walk rate from 4.1% to a minuscule 2.5%, the lowest among qualified starters. Kirby has already made history multiple times with his strike-throwing; he tossed 24 consecutive strikes at one point as a rookie and now owns the record for the most quality starts with zero walks (11) by a pitcher age 25 or younger. Kirby lowered his WHIP from 1.21 as a rookie to 1.04 last season while adding more than 60 innings to his 2022 total. His five-pitch mix would seem to give him some room for growth in the strikeout department (career 23.5 K%), but until we see that growth, Kirby should probably remain just outside the fantasy ace tier.
More Fantasy News

Begins season on shelf
The Mariners placed Kirby (shoulder) on the 15-day injured list Thursday.
ANALYSIS
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Will throw again Saturday
Kirby (shoulder) made 20 throws from 60 feet Friday and will expand his throwing distance to 75 feet Saturday, Ryan Divish of The Seattle Times reports.
ANALYSIS
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Plays catch Friday
Kirby (shoulder) played catch with a trainer for a few minutes Friday, Shannon Drayer of SeattleSports.com reports.
ANALYSIS
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Hopes to start playing catch soon
Kirby (shoulder) hopes to begin playing catch in the next few days, Ryan Divish of The Seattle Times reports.
ANALYSIS
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Recently received injection
Manager Dan Wilson revealed Thursday that Kirby (shoulder) has recently received a biologics injection, and the hope is the right-hander will be able to return to strengthening activities within 3-to-4 days, Shannon Drayer of SeattleSports.com reports.
ANALYSIS
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Latest Fantasy Rumors

Not untouchable?
Kirby could be included as part of a package for Shohei Ohtani, speculates Jim Bowden of The Athletic.
ANALYSIS
Kirby, a 2019 first-round pick, owns a 3.43 ERA this season and a 3.41 ERA across 43 career starts. His .266 expected batting average is subpar, but he counters that with excellent control that's evidenced by his 2.4 percent walk rate, which is the best mark among all qualifiers. He's a logically desirable target in the context of an Ohtani blockbuster.
Kirby, a 2019 first-round pick, owns a 3.43 ERA this season and a 3.41 ERA across 43 career starts. His .266 expected batting average is subpar, but he counters that with excellent control that's evidenced by his 2.4 percent walk rate, which is the best mark among all qualifiers. He's a logically desirable target in the context of an Ohtani blockbuster.