Marvin Bagley's Father Implies Joel Berry is a 'Dirty Player' Posted Mar 15, 2018 The intensity of the UNC-Duke rivalry has no limits. One day after the Tar Heels defeated the Blue Devils in the ACC Tournament semifinal - which included yet another viral clip of Grayson Allen tripping an opponent - the father of Duke freshman Marvin Bagley III took to Facebook to defend Allen by implying that UNC star point guard Joel Berry is the "dirty player." (Inside Carolina)