Dwane Casey spent the early portion of the fourth quarter shouting at his players while they squandered a 17-point lead against the weary Houston Rockets. Whatever the message was for his Toronto Raptors was received just in time. DeMar DeRozan scored 23 points as the Raptors used sizzling first-half shooting and a pivotal fourth-quarter surge to upend the struggling Rockets 116-98.