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When will NFL free agency commence? Nobody knows for sure. But there have been reports that unsigned players who have accrued at least four years in the NFL will be eligible. With that in mind, here's a look at the running backs likely to be available whenever free agency begins.

NFC South opponents know how tough it is to slow down DeAngelo Williams. Before this past season was cut short by a foot injury, Williams rushed for more than 2,600 yards and 25 touchdowns in the two previous seasons.

Text: Jonathan Jones, SI.com
Photo: Lou Capozzola/SI

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