The Kansas City Chiefs are concerned their All-Pro running back could be out a while, and the Miami Dolphins already know their top rusher will be. The winless Chiefs need Alex Smith to start proving he was worth that big contract, especially with Jamaal Charles' status unclear, and Ryan Tannehill hopes to begin showing he's worthy of one for a Dolphins team missing Knowshon Moreno. This matchup Sunday in Miami features teams coming off losses which included potentially major blows to their rushing attacks. Charles, whose 1,980 total yards last season were second in the NFL, suffered a high ankle sprain in the first quarter of a 24-17 loss at Denver last Sunday.

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