"Fair warning: You've probably read this story before.

The main characters, as always, are the same.

On one side: the members of the San Francisco 49ers' defense, which hasn't allowed a 100-yard rusher or a rushing touchdown in, seemingly, forever.

On the other side: a talented running back capable of finally snapping the Niners' impressive streaks.

Previous versions of this tale in 2011 have featured Cincinnati's Cedric Benson, Philadelphia's LeSean McCoy, St. Louis' Steven Jackson and Baltimore's Ray Rice, a failed quartet that averaged 40 yards a game and 2.8 yards a carry against the 49ers and never reached the end zone.

So why keep reading when the script always ends with the same scene?"