Super Bowl XLV: Clay Matthews and the 5 Biggest X Factors on Super Bowl Sunday

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Super Bowl XLV: Clay Matthews and the 5 Biggest X Factors on Super Bowl Sunday
Kevin C. Cox/Getty Images

Every Super Bowl it happens.

Whether the guy is a relative unknown (David Tyree) or he's an explosive player waiting to make a huge play (Tracy Porter), there is usually one defining play to every Super Bowl.

This year will be no different.

Both the Steelers and Packers have plenty of guys that can break this game open at any time.

Here are five guys you should keep an eye on for the biggest game on the planet, Super Bowl XLV.

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