What actors and actresses appeared in Major League Baseball Slugfest 2003 - 2002?

Major League Baseball Slugfest 2003 (and the 2002 version, which used the same engine and assets) did not feature any real-life actors or actresses in the game.

The game relied on digitized likenesses of actual MLB players, but the characters themselves did not have any voice acting or motion capture work done by actors.

Therefore, you wouldn't see any familiar faces in the game's cutscenes or gameplay.