Even the most casual NFL fan is well aware of Denver quarterback Peyton Manning's brilliance. And after last week, is there anyone who isn't aware of the outspoken Richard Sherman? Yet, as Baltimore wide receiver Jacoby Jones demonstrated in last year's Super Bowl, a big-game hero can burst unknown from the ranks to etch his name into football lore forever.
Here are five X-factors with the potential to make a mark at MetLife Stadium come Feb. 2:
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