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.

When paired with a team, must have played catcher in a game for that team. When paired with a non-team category, does not need to be in the same season.

When paired with a team, 40 HR 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.