The Super Bowl is always centered around marquee names but, like any football game, can often be decided by X-factors. Baltimore and San Francisco may both possess a barrage of star power, but they are fueled as much by lesser-known guys. 49ers tight end Vernon Davis caught just seven balls in quarterback Colin Kaepernick's first seven starts, yet amassed 106 yards and a touchdown against the Falcons. Meanwhile, Ravens tight end Dennis Pitta wasn't a Pro Bowler either, yet is often Joe Flacco's go-to receiver when it matters most.
Here are five key X-factors who may make the difference on Super Bowl Sunday: