15-Day IL
Injury Shoulder
Est. Return 5/14/2025
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

Sharp in first rehab start
Kirby (shoulder) struck out four and allowed one earned run on one hit and no walks over three innings in his first rehab start for Triple-A Tacoma on Sunday.
ANALYSIS
Pitching in a game setting for the first time since Feb. 26, Kirby performed about as well as the Mariners could have hoped, with a one-out solo home run in the third inning representing the only damage on his line. He otherwise avoided mistakes while spotting 33 of his 42 pitches for strikes and topping out at 97.8 miles per hour with his sinker. Mariners president of baseball operations Jerry Dipoto told MLB Network on Friday that he expects Kirby to require just 2-to-3 rehab starts prior to returning from the 15-day injured list, so the right-hander will be in line for another appearance in the minors next weekend before the organization determines his next step.
Pitching in a game setting for the first time since Feb. 26, Kirby performed about as well as the Mariners could have hoped, with a one-out solo home run in the third inning representing the only damage on his line. He otherwise avoided mistakes while spotting 33 of his 42 pitches for strikes and topping out at 97.8 miles per hour with his sinker. Mariners president of baseball operations Jerry Dipoto told MLB Network on Friday that he expects Kirby to require just 2-to-3 rehab starts prior to returning from the 15-day injured list, so the right-hander will be in line for another appearance in the minors next weekend before the organization determines his next step.
Pitching Stats
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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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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

Ready for rehab assignment
Kirby (shoulder) will begin his rehab assignment with Triple-A Tacoma on Sunday, Adam Jude of The Seattle Times reports.
ANALYSIS
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Aiming to return before end of May
Mariners president of baseball operations Jerry Dipoto said Friday on MLB Network that he's "hopeful" Kirby (shoulder) will rejoin the rotation before the end of May, Shannon Drayer of SeattleSports.com reports.
ANALYSIS
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Rehab game could come this weekend
Kirby (shoulder) could begin a rehab assignment as soon as Sunday, Daniel Kramer of MLB.com reports.
ANALYSIS
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Slated for live BP
Kirby (shoulder) will throw a live batting practice Monday, Daniel Kramer of MLB.com reports.
ANALYSIS
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Slated to face hitters this week
Kirby (shoulder) is scheduled to throw a live batting practice session at T-Mobile Park this week, Daniel Kremer of MLB.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.