sentences:  3 small forward by Rivals.com.Greene graduated in 2007 from Towson Catholic High School, where he averaged 18.4 points, 6.8 rebounds, 3.0 assists, 2.1 steals and 4.3 blocks per game as a senior in 2006–07, and helped Towson Catholic to a 32–6 record and to its second consecutive Maryland Interscholastic Athletic Association A Conference and Baltimore Catholic League titles.Greene again played on Team USA in the 2007 USA Basketball U19 World Championships.