From the Super Mario Wiki
Pam is a student at the Royal Tennis Academy during the events of the Game Boy Color version of Mario Tennis. She is an all-around player with below average stats. Pam belongs to the fourth rank of the Junior class in singles until Alex/Nina defeats her. In Junior doubles, she is paired with Beth and belongs to the second rank. Her in-game sprite depicts her as an adolescent with black hair and wearing a blue hat.