SANTA CLARA – Alone atop the NFC West are the undefeated 49ers, a fact that caught at least one of them off guard.

“How did the Rams lose?” right guard Dominick Puni casually asked at his locker. “The last thing I saw (pregame) was the training room TV and they were lining up for a winning field goal.”

Nope, the Eagles blocked it, returned it 44 yards for a touchdown, and remained unbeaten with a 33-26 home win over the Rams (2-1). The NFC’s only other 3-0 team is the Tampa Bay Buccaneers, who, like the 49ers, won on a walk-off field goal.

That’s a lot of field-goal action, and the 49ers are loving their honeymoon period with Eddy Piñeiro, who banged home a 35-yard game-winner while predecessor, Jake Moody, is a Chicago Bears practice-squad refugee.

The Niners’ margins of victory each

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