Freshman Sierra Calhoun has decided to leave Duke University, school officials announced Sunday. Calhoun departs Duke in good academic standing and is expected to transfer to another Division I school.A native of Brooklyn, N.Y., Calhoun had started all 13 games for the 10th-ranked Blue Devils averaging 10.1 points, 3.8 rebounds, 1.4 assists and 1.1 steals on the season."We appreciate Sierra very much and wish her the very best," said Duke head coach Joanne P. McCallie Duke is coming off an 87-36 victory over N.C. A&T Friday night and will host Wake Forest Sunday at 2:00 p.m., in Cameron Indoor Stadium, as the Blue Devils open ACC play.