While ?The Greatest Showman? isn?t performing as well as Fox might have hoped, the studio still has reason to smile this Christmas weekend as its major awards contender, ?The Post,? is off to a great start in limited release. Steven Spielberg?s recounting of The Washington Post?s acquisition and publishing of The Pentagon Papers opened on nine screens this weekend and is looking at a four-day start of $715,000, good for a per screen average of just under $80,000.