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-hitter" is defined as a completed game in which a team that batted in at least nine complete innings recorded no hits. Includes individual no-hitters and pitchers who participated in a combined no-hitter. When paired with a team, the no-hitter must have been with that team. When paired with a non-team category, does not need to be in the same season. Negro League no-hitters not included at this time.

Since 1947. When paired with a team, the player must have won the Rookie of the Year award in a season he appeared for that team. When paired with a non-team category, does not need to be in the same season.