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There aren’t any clear-cut Rookie of the Year candidates yet this NFL season, but plenty of rookies, such as Cleveland Browns running back Terrance West and left guard Joel Bitonio, have already made significant contributions for their teams in the first two weeks of the regular season.

Throughout the season here at Bleacher Report, I am tracking which rookies are standing out among their peers. The top five first-year players at each position, and top 50 overall, are ranked each week.

The rankings remain very fluid at this stage of the year, as there have only been two games played and many rookies were significantly more or significantly less productive in Week 2 than they were in Week 1.

Over the course of the year, the rankings will be determined based upon each rookie’s cumulative performance for the regular season.

In the following slides, you’ll be able to see how the rookies stack up after two weeks and in comparison to last week’s rankings. The rankings will stabilize increasingly with each passing week, but this week brings many major changes, as some NFL newcomers had breakout performances, while others failed to back up their Week 1 impressions.