Arizona's Peterson still honing his CB skills - CBS 5 - KPHO

FLAGSTAFF, Ariz. (AP) -- It sounds strange to say Patrick Peterson could have a breakthrough season this year. After all, the spectacular Arizona Cardinals cornerback returned four punts for touchdowns, one for 99 yards, and made the Pro Bowl as a rookie kick returner last season.

But he knows that his biggest value to the Cardinals will be as a shutdown cornerback, and he learned a year ago that there probably is no tougher task in the NFL than trying to defend the best receivers in the game when pretty much all the rules are tilted toward the offense.

Peterson made great strides as the season went on and he's vowing to keep on improving as he goes against wide receiver extraordinaire Larry Fitzgerald in practice after practice.

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