Seattle Mariners right-handed pitcher Luis F. Castillo was optioned to Triple-A Tacoma following their contest on Wednesday afternoon against the Houston Astros. Castillo was given two starts during his brief stint in the big leagues but will now head back to the top level of the minor leagues to continue his development. On Wednesday, Castillo stumbled as he allowed six hits and four runs (three earned) with five walks across four innings of work. Castillo also logged four 2/3 innings in the major leagues last season and did not allow a run. The 30-year-old was initially promoted to provide depth in the rotation with George Kirby (shoulder) on the IL. Fantasy managers should monitor the Seattle rotation as they could promote Emerson Hancock to fill the spot in the rotation.

Seattle Mariners right-hander Luis F. Castillo was officially called up from the minors on Friday and will make the start in San Francisco against the Giants at Oracle Park. It's the second straight game that the Mariners will start a pitcher named Luis Castillo. The 30-year-old Dominican made his major-league debut back in 2022 with the Detroit Tigers but only appeared in three games in relief that year, although he tossed 3 2/3 scoreless innings with no walks and four strikeouts. In his lone start with Triple-A Tacoma this year before being called up, Castillo allowed an earned run on two hits while walking two and striking out two in 5 2/3 frames. Castillo heads to Seattle with a 3.46 ERA and 1.30 WHIP with 415 strikeouts and 131 walks in 11 minor-league seasons. Castillo spent the last two years pitching for Japan. Fantasy managers will want to avoid him in his first big-league start on Friday.

Seattle Mariners starting pitcher Luis F. Castillo is expected to be promoted from Triple-A to start on Friday against the Giants. He's not to be confused with the other pitcher of the same name, who has been a staple of the Seattle's rotation for years. Luis F. Castillo has spent the last two seasons in Japan but is now ready to make his first start in the majors. He likely won't stick in the rotation for long, though, especially with George Kirby working his way back from a shoulder injury.