Why 3 Is The Most Important Number In Football

Tramaine Brock
San Francisco 49ers cornerback Tramaine Brock Jeff Hanisch USA TODAY Sports

San Francisco: CB Tramaine Brock

Behind starters Carlos Rogers and Tarell Brown was Brock. An undrafted free agent in 2010, Brock thrived as the nickel back and eventually out-performed Brown en route to taking his job. Brock earned a +8.1 coverage grade by Pro Football Focus, and is now slated to start this year.

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