Detroit Lions wide receiver Calvin Johnson (81) breaks away from Atlanta Falcons defensive back Dominique Franks (29) during the third quarter of an NFL football game at Ford Field in Detroit, Saturday, Dec. 22, 2012. (AP Photo/Duane Burleson)
Washington Redskins quarterback Robert Griffin III scrambles with the ball during the second half of an NFL football game against the Baltimore Ravens in Landover, Md., Sunday, Dec. 9, 2012. (AP Photo/Nick Wass)
Tennessee Titans running back Chris Johnson (28) runs for a 94-yard touchdown run against the New York Jets in the second quarter of an NFL game on Monday, Dec. 17, 2012, in Nashville, Tenn. (AP Photo/Wade Payne)
Philadelphia Eagles quarterback Nick Foles, right, fakes a handoff to running back LeSean McCoy during practice at the team's NFL football training facility, Wednesday, Dec. 19, 2012, in Philadelphia. (AP Photo/Matt Rourke)
Washington Redskins quarterback Robert Griffin III before an NFL football game against the Cleveland Browns in Cleveland, Sunday, Dec. 16, 2012. (AP Photo/Rick Osentoski)
Washington Redskins tackle Tyler Polumbus (74) blocks Cleveland Browns defensive tackle Ahtyba Rubin (71) during an NFL football game in Cleveland, Sunday, Dec. 16, 2012. (AP Photo/Rick Osentoski)
New York Giants wide receiver Victor Cruz warms up before an NFL football game against the New Orleans Saints, Sunday Dec. 9, 2012, in East Rutherford, N.J. (AP Photo/Bill Kostroun)
Washington Redskins quarterback Robert Griffin III before an NFL football game against the Cleveland Browns in Cleveland, Sunday, Dec. 16, 2012. (AP Photo/Rick Osentoski)