The Seattle Mariners made significant roster moves by tendering contracts to 29 players while non-tendering four, creating openings in the infield and bullpen. The team showed improvement in the second half of the season, aided by rookie Troy Taylor's performance.

However, the Mariners have lost over 30 minor leaguers, including left-handed reliever CJ Widger, who signed with the San Diego Padres. Widger's inconsistent stats raised questions about his future potential in the majors.