Three Mariners Prospect Pitchers to Watch in Spring Training

Pitchers and catchers report to Peoria Sports Complex on February 12, 2026, a date that is fast approaching as the offseason comes to its waning hours. The Seattle Mariners are likely all but complete when it comes to the major league roster, but quite a few non-roster invitees to spring training are looking to prove themselves on the mound for a chance to expedite their minor league journeys, or in some cases, punch their ticket to the Show for 2026.

The Mariners’ farm system has a good share of high-end prospects and a fair amount of outside threats, but not a lot of stuff in the middle. This is especially true of the pitchers, where there are two titanic names on Baseball America’s top 100 [1] in Kade Anderson and Ryan Sloan and a heap of names with much less fanfare.