In this study we investigate the contribution of achievement in team sports to adolescent girls' self-esteem development. Adolescent girls (N= 247) from racially and ethnically diverse backgrounds were surveyed as part of a larger study investigating the development of poor urban youth. Participants responded to items tapping global self-esteem, team sports achievement, and athletic self-evaluations. The results of hierarchical regression analyses indicate that girls' team sports achievement experiences in early adolescence are positively associated with self-esteem in middle adolescence. This relationship is partially mediated by team sports self-evaluations. Applications of these findings to the development of interventions designed to enhance the self-esteem of young women and girls are discussed.