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The Minnesota Vikings exceeded expectations in 2012. They posted a 10-6 record after going 3-13 the previous year, marking the greatest turnaround in franchise history. The infamous 15-1 season in 1998 after a 9-7 season in 1997 was the prior record.

With that said, there are several players who need to improve in 2013 for the Vikings to remain relevant in the NFC North. One player exempt from the discussion is Adrian Peterson, who became the first running back to win the MVP award since LaDainian Tomlinson in 2006.

Standout rookies Matt Kalil, Harrison Smith and Blair Walsh are also safe from criticism, comprising a stellar draft class orchestrated by Rick Spielman.

The following five teammates will have the most to prove in 2013 and are key elements for the Vikings to reach the next level beyond a playoff berth. Leslie Frazier's job security also rests securely on these players' collective shoulders.