Seattle Mariners on X: Adding another ace. We've acquired All-Star RHP Luis Castillo from the Reds in exchange for IF Noelvi Marte, IF Edwin Arroyo, RHP Levi Stoudt and RHP Andrew Moore.

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Seattle Mariners trade for Luis Castillo

Seattle Mariners acquire Luis Castillo, send package highlighted

Mariners acquire Reds All-Star pitcher Luis Castillo in trade

Bronson Bowe (@LeBronson12) / X

Phillies stay quiet on Monday as MLB trade deadline looms

Phillies stay quiet on Monday as MLB trade deadline looms

Mariners get All-Star RHP Castillo for prospects Marte and Arroyo

The Athletic on Twitter: The Seattle Mariners are close to

Reds trade ace Luis Castillo to Seattle Mariners