Former Hialeah Gardens High basketball standout Gian Clavell recently signed with the Dallas Mavericks after competing for the Miami Heat’s summer league teams in Orlando and Las Vegas.He is the first Hialeah Gardens High alumni to play for an NBA team.The 6-4, 185-pound undrafted rookie from Colorado State University, who was named Mountain West Conference Player of the Year, averaged 12.4 points, 2.6 rebounds, 1.4 assists and 24.6...