This is the executive summary for the report, "How Tennis Influences Youth Development." This research initiative aimed to describe and analyze U.S. youth participation in tennis. The major goal was to better understand how tennis and other popular youth sports impact teen well-being. The findings discussed in this report provide evidence that tennis participation positively influences the lives of U.S. adolescents. Overall, the data show a general profile of tennis players as well-rounded, successful at school, and involved with extracurricular activities. Tennis players also appear to be healthy overall and less prone to key adolescent health-risk behaviors than non-athletes and their peers who participate in other sports. This report builds on the research project, "Teen Sport in America: Why Participation Matters" (see ED588346). [The policy recommendations in the report were written by Deborah Slaner Larkin and Marjorie Snyder with input from the USTA Foundation, New York Junior Tennis and Learning, and "Tennis" Magazine. This report was made possible through a partnership between the Women's Sports Foundation® and the MARGARET Fund. For the full report, see ED598617.]