The Seattle Mariners' history is generously salted with remarkable Major League Baseball debuts. This article ranks those debuts using three criteria.
First, I consider the impact each player made in his first season. The second and third criteria derive from the players' career impacts with the Mariners and their career impacts on MLB overall.
Michael Pineda's remarkable rookie year spurred this list. Players showing early greatness lead to thoughts of the future. Here I entertain Pineda's place in the pantheon.
A handful of great Seattle Mariners are absent from this list. They are absent because they began their careers with other teams or their Mariner careers were launched so slowly that in no way could they be considered rookie sensations. You can probably guess who those players are.