Seattle Mariners Make Flurry of Roster Moves, Including Sending Top 100 Prospect to Minors

Michael Arroyo, who just helped Colombia advance to the World Baseball Classic, has been cut from Seattle Mariners big-league camp. He wasn't the only one, so check out the full list here.

Seattle Mariners infielder Michael Arroyo poses for a portrait during media day at Peoria Sports Complex on Feb. 20. | Mark J. Rebilas-Imagn Images

The Seattle Mariners made a number of cuts from big-league spring training on Monday, including sending top prospect Michael Arroyo down to minor league camp.

Per @MarinersPR on social media:

@Mariners Spring Training Roster Moves:

Optioned to Triple-A Tacoma:

Cody Bolton, RHP

Re-assigned to minor league camp:

Michael Arroyo, INF
Luis F. Castillo, RHP
Jhonathan Díaz, LHP
Adonis Medina, RHP
Jacob Nottingham, C
Nick Raposo, C

The 28-year-old Diaz is the most recognizable name, having served as valuable depth for the Mariners in 2024. He put together a solid season at Triple-A Tacoma, going 9-3 with a 4.36 ERA in 23 appearances. Furthermore, the M's brought him up on multiple occasions to fill holes in the roster. He made five appearances (one start), going 0-1 with a 4.66 ERA. While Emerson Hancock is the No. 6 starter in the organization, there's a toss-up between Diaz and prospect Logan Evans for the No. 7 spot.

With the M's already down George Kirby from the early season rotation, Diaz is just one more injury away from being necessary once again.

Arroyo, 20, is another big name, as he enters the season as the No. 97 prospect in baseball. He spent last season in an even split between Low-A Modesto and High-A Everett. He played 60 games in each spot, hitting a combined .285 with 23 homers and 89 RBI. He's one of several middle infielders who make up the top of the M's farm system, including Cole Young and Colt Emerson.

Arroyo is seen as a fast-riser, with MLB.com predicting that he'll make his debut in 2026. He just helped lead his home nation of Colombia to the World Baseball Classic.

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