Debut
Speier made his MLB debut for Kansas City against Detroit on September 5, 2019.
Source: Baseball-ReferenceAthlete profile
Gabe Speier
Gabriel James Speier is a left-handed relief pitcher who joined Seattle before the 2023 season.
Gabe Speier Dossier
Know the player. Know the game.
A sourced guide to playing history, team affiliations and the documented career behind the athlete.
Most recent first
Gabe Speier History
Joined Seattle
Speier spent four seasons in the Royals organization before joining Seattle ahead of the 2023 season.
Source: Everett AquaSox and Minor League BaseballMajor-league debut
Speier worked one scoreless, hitless inning with two strikeouts and one walk in his MLB debut.
Source: Baseball-Reference
The essentials
Gabe Speier Facts
Debut Performance
Speier worked one scoreless, hitless inning with two strikeouts and one walk in his MLB debut.
Source: Baseball-ReferenceSeason Performance
Speier recorded a 2.61 ERA with 82 strikeouts and 11 walks across 76 relief appearances for Seattle in 2025.
Source: Seattle Mariners and Major League BaseballTeam history