On January 26, 2012, Legacy High School hosted the 19th Annual Mansfield ISD 3-on-3 Intermediate School Basketball District Championships. Each intermediate school held campus tournaments to send their winning teams. In all, approximately 200 intermediate students participated.

The 3-on-3 event started with one school, Cross Timbers Intermediate School, back in 1993. Since then the event has grown to include all six intermediate schools in MISD.

The 3-on-3 intermediate tournament is a part of the Physical Education classes. The 3-on-3 basketball tournament was originally a part of a campus improvement plan. The program was created to improve student attendance and has turned into a great, fun opportunity to learn teamwork. Some of the participants from this event have gone on to play basketball at various levels: 4A and 5A State Champions, NCAA Div. 1 Men's and Woman's basketball and even a European league.