Theo Gillen

Theodore Gillen is an American professional baseball center fielder in the Tampa Bay Rays organization.

Amateur career

Gillen attended Westlake High School in Austin, Texas, where he played baseball. Injuries to his labrum and knee forced him to miss playing time early in his high school career. As a senior in 2024, he batted.415 with seven home runs, thirty RBIs, and 29 stolen bases. He committed to play college baseball for the Texas Longhorns.

Gillen was selected by the Tampa Bay Rays with the 18th overall pick in the 2024 Major League Baseball draft. On July 26, 2024, Gillen signed with the Rays on a $4.37 million contract.
Gillen made his professional debut with the Charleston RiverDogs, batting.154 over eight games. He returned to Charleston to open the 2025 season. He was placed on the injured list with a finger fracture in August, ending his season. Over 73 games for the season, Gillen hit.267 with five home runs, 18 RBI, and 36 stolen bases.