George Klassen

23-Year-Old PitcherP
Los Angeles Angels AAA
2026 Fantasy Outlook
Klassen finished 2025 on a roll, striking out 40 batters while walking 12 with a 1.55 ERA over 29 innings -- including his first career start at Triple-A. The 6-foot-2 righty, who turned 24 this winter, has some of the best pure stuff in the minors (dominant fastball, two monster breaking balls), but walks have often held him back. He cut his walk rate from 17.3 percent in seven starts at Double-A to close 2024 to 9.7 percent in 25 starts this year (24 at Double-A, one at Triple-A) while logging a career-high 108.2 innings. His command still comes and goes, and he had six starts last year in which he gave up five or more earned runs, although he also had seven starts with eight or more strikeouts. Klassen's below-average command may push him to the bullpen eventually, but the Angels figure to give him every opportunity to develop as a starting pitcher over the next couple years. He is even a dark horse candidate to win a big-league rotation spot this spring. Read Past Outlooks
RANKS
From Preseason
#363
ADP
Signed a $300,000 contract with the Phillies in July of 2023. Traded to the Angels in July of 2024.
Rolling for Trash Pandas
PLos Angeles Angels  AAA
September 15, 2025
Klassen has a 1.17 ERA, 1.26 WHIP and 32:11 K:BB in 23 innings over his last four starts for Double-A Rocket City.
Analysis
Klassen has some of the best pure stuff in the minors, and it's on brand for him to have a higher WHIP than ERA over this dominant stretch. He's cut his walk rate from 17.3 percent in seven starts at Double-A to close 2024 to 10 percent in 24 starts this year while logging a career-high 102.2 innings. His command still comes and goes, and he has six starts this year in which he has given up five or more earned runs, although he also has six starts with eight or more strikeouts. Klassen's below-average control may push him to the bullpen eventually, but the Angels figure to give him every opportunity to develop as a starting pitcher over the next couple years.
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Minor League Game Log
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Minor League Left/Right Pitching Splits (AAA)
Since 2023
 
 
-100%
BAA vs LHP
2025
 
 
-100%
BAA vs LHP
2024
No Stats
2023
No Stats
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .000 9 6 1 0 0 0 0
Since 2023vs Right .400 15 2 0 6 0 0 0
2025vs Left .000 9 6 1 0 0 0 0
2025vs Right .400 15 2 0 6 0 0 0
2024vs Left 0 0 0 0 0 0 0 0
2024vs Right 0 0 0 0 0 0 0 0
2023vs Left 0 0 0 0 0 0 0 0
2023vs Right 0 0 0 0 0 0 0 0
Prospect Rankings History
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Recent RotoWire Articles Featuring George Klassen See More
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More Fantasy News
Returns from minor-league IL
PLos Angeles Angels  AAA
June 1, 2025
Klassen (concussion) was activated from Double-A Rocket City's 7-day injured list Sunday.
Analysis
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Goes on IL
PLos Angeles Angels  AAA
Concussion
May 18, 2025
Double-A Rocket City placed Klassen (concussion) on its 7-day injured list Tuesday.
Analysis
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Alert after taking liner to head
PLos Angeles Angels  AAA
Head
May 12, 2025
Klassen is awake and alert after taking a line drive to the head in his start with Double-A Rocket City on Sunday, Sam Blum of The Athletic reports.
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Dealt to Angels
PLos Angeles Angels  AAA
July 27, 2024
The Angels acquired Klassen and left-hander Samuel Aldegheri from the Phillies on Saturday in exchange for right-hander Carlos Estevez, Scott Lauber of The Philadelphia Inquirer reports.
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Moves up to High-A
PPhiladelphia Phillies  AAA
June 10, 2024
The Phillies promoted Klassen from Single-A Clearwater to High-A Jersey Shore on Monday, Jonathan Mayo of MLB.com reports.
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