MLB Jersey Numbers on X: RHP Luis Castillo will wear number 21. Last worn by OF Steven Souza, Jr. earlier this season. #Mariners / X

Official Luis Castillo Seattle Mariners Jerseys, Mariners Luis Castillo Baseball Jerseys, Uniforms

Luis Castillo Game Used Jersey - Felix HOF Weekend, 8/11/23 vs. BAL - 6 IP, 1 ER, 8 Ks, 8th Win of 2023, 56th of career

Luis Castillo strikes out 10 as Mariners beat Pirates 5-0

Castillo, Crawford lead Mariners to 4-0 win over D-backs - Seattle Sports

Seattle Mariners Luis Castillo Shirt t-shirt by To-Tee Clothing - Issuu

Ronald Acuna Jr Pictures and Photos - Getty Images

DESEAN JACKSON PHILADELPHIA EAGLES NIKE AUTHENTIC ON FIELD JERSEY ADUL - Bucks County Baseball Co.

Why Cubs right-hander Jameson Taillon is developing a new sweeper slider - Chicago Sun-Times

Chicago Man Charged After Allegedly Striking 4 in Hit-and-Run

Boston Red Sox bringing back yellow and blue jerseys this week