Player must have played for only one major league franchise, or only one AL/NL team, in their career. For example, Tony Gwynn (only played for one team, an AL/NL team), Buck Leonard (only played for one team, a Negro Leagues team), Jackie Robinson (only played for one team in AL/NL, but additionally played for a team in the Negro Leagues), and Mike Griffin (only played with one team in the AL/NL, but additionally played in the AA and PL) would all qualify.

No minimum innings requirement. When paired with a team, ≤3.00 ERA must be achieved with that team in a single season. When paired with a non-team category, does not need to be in the same season.

Hall of Famers must be inducted into the National Baseball Hall of Fame but can be inducted from any category (player, manager, umpire, executive/pioneer). When paired with a team, the player must have played a major league game for the team in question. Does not include Ford C. Frick or J.G. Taylor Spink Award winners.