Michael

Arroyo

Arroyo has enjoyed a breakout season. The 21-year-old hit well in 65 games at Double-A and is now slashing .352/.398/.549 in 21 games at Triple-A with three home runs, 19 RBI, two steals, and a 17/5 K/BB ratio. His contact quality doesn’t suggest a ton of MLB power right now, but he’s consistently putting line drives in the gaps and making elite contact in the zone. He’s an interesting name to watch for 2027.

Montes and 2B/OF prospect Michael Arroyo are being promoted to Triple-A Tacoma, according to MLB.com’s Daniel Kramer. Montes is the Mariners’ third-ranked prospect and MLB Pipeline’s 26th overall prospect, while Arroyo is the team’s fourth-ranked prospect and MLB Pipeline’s 43rd overall prospect. Montes hit .236/.365/.554 with 25 home runs and five steals in 78 games at Double-A. That came with a 30.5 percent strikeout rate, 18 percent swinging strike rate, and 62.5 percent contact rate, so those numbers will need to improve in Triple-A before he has a legitimate shot to crack the MLB roster.

Arroyo is one of the top prospects in Seattle’s system and is getting a chance to lead off for Colombia during the international showcase. The 21-year-old second baseman projects as an impact fantasy contributor at second base in the near future thanks to his ability to generate above-average exit velocities while also possessing strong plate discipline.

Arroyo went opposite-field on a two-run shot off Jagger Haynes. His double was also hit to right field from the right side; showing off the 21-year-old’s impressive power potential. Arroyo is one of the best infield prospects in baseball, and while he doesn’t have the same kind of upside as a Colt Emerson, it would not be a massive upset if he reached the majors in 2026 He’s someone who has to be monitored in all eligible formats.

Montes has torn the cover off the ball this season with a Northwest League-leading 18 home runs through 67 games. The 20-year-old slugging prospect has registered an impressive .268/.387/.572 triple-slash line for High-A Everett and will get his first taste of the upper minors as one of the youngest everyday players in the Texas League. He’s a top-30 range prospect for dynasty purposes with a real chance to finish closer to the top-20 range if he keeps hitting at the Double-A level. Meanwhile, Arroyo has hit .269/.422/.512 with 15 homers and three steals through 65 games. He’s one of the highest-ceiling future power sources at the keystone and is a surefire top-50 dynasty prospect at this stage of his development.

Bolton was the lone player from Seattle’s 40-man roster exiting big-league camp in the latest round of cuts. Arroyo is one of the Mariners’ top prospects and should reach Double-A at some point in the next few months. Díaz and Medina figure to make it to Seattle at some point as emergency stopgap options.