]]>

Today, we’re unveiling the 10 best prospects in the Mariners system entering 2026.

The top of the Mariners system is headlined by Colt Emerson, an infielder advanced for his age who should bring a well-rounded offensive profile to the majors in the not-too-distant future.

Baseball America’s Jesús Cano is hosting a chat at 1 p.m. ET to discuss Emerson and the overall state of Seattle’s farm system.


See the 10 best prospects in the Mariners system, including brand new scouting reports for every player.

More Prospect Coverage

Below, you can find our projected Mariners lineup for 2029, as well as a rundown of prospects with the best scouting tools in the system.

Projected 2029 Mariners Lineup

Catcher: Cal Raleigh (32)
First Base: Josh Naylor (32)
Second Base: Michael Arroyo (25)
Third Base: Colt Emerson (24)
Shortstop: Cole Young (25)
Left Field: Randy Arozarena (34)
Center Field: Julio Rodríguez (28)
Right Field: Jonny Farmelo (25)
Designated Hitter: Lazaro Montes (25)

No. 1 Starter: Bryan Woo (29)
No. 2 Starter: Logan Gilbert (32)
No. 3 Starter: George Kirby (31)
No. 4 Starter: Kade Anderson (25)
No. 5 Starter: Ryan Sloan (23)
Closer: Andrés Muñoz (30)

Listed below are the prospects with the best tools within the organization. To go directly to Seattle’s Top 10, click here.

Mariners Best Tools

Best Hitter: Colt Emerson
Best Power Hitter: Lazaro Montes
Best Strike-Zone Discipline: Michael Arroyo
Fastest Baserunner: Tai Peete
Best Athlete: Jonny Farmelo
Best Fastball: Jurrangelo Cijntje
Best Curveball: Mason Peters
Best Slider: Teddy McGraw
Best Changeup: Ryan Sloan
Best Control: Kade Anderson
Best Defensive Catcher: Luke Stevenson
Best Defensive Infielder: Colt Emerson
Best Infield Arm: Colt Emerson
Best Defensive Outfielder: Jonny Farmelo
Best Outfield Arm: Lazaro Montes