DeMarco Murray #29 of the Dallas Cowboys runs the ball against the St. Louis Rams at AT&T Stadium on September 22, 2013 in Arlington, Texas.  (Photo by Ronald Martinez/Getty Images)

DeMarco Murray of the Cowboys runs the ball against the Rams. (Photo by Ronald Martinez/Getty Images)

IRVING (AP) — DeMarco Murray’s expression never changes much, even after the first 100-yard game in more than a year for the Dallas Cowboys running back.

The third-year back said he wasn’t frustrated coming off a 25-yard day in Kansas City that led to questions about whether he was the problem in the running game, rather than the blocking or the scheme or anything else.

On the flip side, Murray wasn’t shouting “I told you so” when he ran through St. Louis for 175 yards two years after he set a franchise record with 253 yards as a rookie against the Rams.

Murray says he tunes out the analysis after big games or bad ones. He’s getting ready to face San Diego for the first time in his career Sunday.

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