Castillo is expected to be promoted from Triple-A Tacoma to start against the Giants on Friday, Adam Jude of The Seattle Times reports.

EDGE Analysis

Not to be confused with the Luis Castillo already in Seattle's big-league rotation, this 30-year-old righty made his MLB debut with the Tigers in 2022 and threw 3.2 shutout frames while striking out four batters across three relief appearances. He then spent the next two seasons in Japan and is now slated to make his first career start in the majors. A strong showing Friday could buy the lesser-known Castillo another turn through the rotation while the Mariners await George Kirby's (shoulder) return from the IL.

The Mariners reassigned Castillo to minor-league camp Monday.

EDGE Analysis

After spending the past two seasons in Japan's Nippon Professional Baseball, Castillo returned stateside over the winter, joining the Mariners on a minor-league deal that included an invitation to spring training. The 30-year-old didn't mount much of a case for a spot in Seattle's Opening Day bullpen, giving up three earned runs on nine hits and two walks while striking out five over five innings across his three Cactus League appearances. Castillo is expected to report to Triple-A Tacoma to begin the 2025 season.

The Mariners signed Castillo to a minor-league contract Tuesday that includes an invitation to spring training, Jon Heyman of the New York Post reports.

EDGE Analysis

Not to be confused with the other Castillo of the same name, this Castillo spent the previous two seasons in Japan pitching for the Chiba Lotte Marines and then Orix Buffaloes. The reliever made three appearances with the Tigers in 2022, tossing 3.2 scoreless innings.

Castillo cleared waivers and was outrighted to Triple-A Toledo on Thursday.

EDGE Analysis

Castillo appeared in three games for the Tigers in 2022, so it's not a major surprise he won't remain on the 40-man roster through the offseason. He spent most of the year at Toledo, where he had a 1.74 ERA, 1.22 WHIP and 39:11 K:BB over 41.1 innings.

Castillo was optioned to Triple-A Toledo on Thursday.

EDGE Analysis

Castillo will head back to the minors after being called up Sunday and throwing a scoreless 1.2 inning performance Monday against the Angels. The 27-year-old righty has been dominant in Triple-A Toledo this season with a 1.79 ERA and 1.20 WHIP and has 38 strikeouts over 40.1 innings out of the bullpen.

Castillo was recalled from Triple-A Toledo on Sunday, Cody Stavenhagen of The Athletic reports.

EDGE Analysis

Castillo has been dominant in the minors this year, posting a 1.79 ERA and 1.20 WHIP in 40.1 innings over 39 appearances at Toledo. He's tossed two scoreless innings in the majors and will rejoin the Tigers' bullpen after Michael Pineda was designated for assignment Sunday.

Castillo was optioned to Triple-A Toledo after Thursday's extra-inning loss to the Guardians, Evan Woodbery of MLive.com reports.

EDGE Analysis

The 27-year-old was called up from Triple-A over the weekend and delivered two scoreless frames in two appearances during his first taste of the big leagues. Castillo will return to Toledo, where he has a 1.56 ERA, 1.20 WHIP and 32:10 K:BB across 34.2 innings.