Theo Gillen

19-Year-Old OutfielderOF
Tampa Bay Rays A
7-Day IL
Injury Undisclosed
Est. Return 9/4/2025
2025 Fantasy Outlook
A prep infielder from Texas whom the Rays selected in the first round last year, Gillen needed shoulder surgery as a sophomore and dealt with a knee injury as a junior, but he always had a great hit tool, and he started to hit for power as a senior. The 6-foot-2 lefty hitter is a plus runner whose speed has been trending up, and he projects for at least above-average power. It's a weak crop of prep hitting prospects, and Gillen might be the safest bet to hit, although his defense is more of a question. His below-average arm is a liability at any position, and the Rays deployed him exclusively in center field during his brief pro debut after signing for $4.37 million. The lefty-hitting Gillen can expect to sit against most lefties when he initially gets to Tampa Bay in a few years, but it's possible he hits enough to eventually shed a platoon. Read Past Outlooks
RANKS
Rest of Season From Preseason
Signed a $4.37 million contract with the Rays in July of 2024.
Shut down at Single-A
OFTampa Bay Rays  A
Undisclosed
August 24, 2025
Single-A Charleston placed Gillen on the 7-day injured list Aug. 16 due to an unspecified injury.
Analysis
A 19-year-old outfielder, Gillen has submitted an impressive debut campaign in full-season ball, slashing .267/.433/.387 with 36 stolen bases in 39 attempts and a 20.8 percent walk rate. The Rays haven't indicated whether Gillen has any chance of playing again in 2025, but he's likely done enough during his time at Charleston to earn a bump up to High-A Bowling Green next season.
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Batting Stats
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Minor League Game Log
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Minor League Left/Right Batting Splits (A)
Since 2023
 
 
+18%
OPS vs RHP
2025
 
 
+25%
OPS vs RHP
2024
 
 
-100%
OPS vs RHP
2023
No Stats
OPS PA R HR RBI SB AVG OBP SLG
Since 2023vs Left .693 69 0 1 .259 .397 .296
Since 2023vs Right .818 289 5 19 .256 .432 .386
2025vs Left .449 69 0 1 .259 24.044 .296
2025vs Right .560 255 5 17 .270 105.028 .413
2024vs Left 0 0 0 0 0 0 0 0 0
2024vs Right .283 34 0 2 .154 12.000 .192
2023vs Left 0 0 0 0 0 0 0 0 0
2023vs Right 0 0 0 0 0 0 0 0 0
Prospect Rankings History
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Additional Stats
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Defensive Stats
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More Fantasy News
Activated Sunday
OFTampa Bay Rays  A
April 28, 2025
Single-A Charleston activated Gillen (calf) from the 7-day injured list Sunday.
Analysis
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Out with calf injury
OFTampa Bay Rays  A
Calf
April 3, 2025
Gillen is dealing with a calf injury and could join Single-A Charleston in three weeks, Sam Dykstra of MLB Pipeline reports.
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Drafted by Rays
OFTampa Bay Rays  A
July 14, 2024
The Rays have selected Gillen with the 18th overall pick in the 2024 First-Year Player Draft.
Analysis
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