ASHBURN, Va. (AP) – Robert Griffin III was rusty. No one is sure why the rest of the Washington Redskins were so out of sync.  The Redskins’ season-opening loss to the Philadelphia Eagles was quite the letdown. A breakdown in fundamentals left Washington 26 points behind late in the third quarter.  It’s easy to say the Redskins drew a short straw by facing a fast-paced Eagles offense making its NFL debut under coach Chip Kelly, but coach Mike Shanahan said Philadelphia ran only one play that Washington didn’t see in practice.  The Redskins are on the road against the Green Bay Packers on Sunday.