The qualifications closely mirror those of the end of the season player awards.
The following criteria is used:
SP - innings pitched, earned runs, strikeouts, shutouts, wins, and losses
RP - innings pitched, earned runs, strikeouts, saves, wins, losses
1B/2B/3B/SS/LF/CF/RF - runs created, good plays, poor plays, errors, team winning percentage
DH - runs created per 27 innings, plate appearances, team winning percentage
C - runs created, good plays, poor plays, errors, passed balls, team winning percentage