At the beginning of a game, before the announcer says, "Let's go
to the floor for player introductions," hit start and go to
substitutions.  Change the lineup so that one of the players
already in the game is at the center's position (ex. if you have the
Lakers, take Kobe and switch him for Shaq).  Then, exit out of
the substitutions.  The player you switched with the center
should be at the line along with the original center.