NFL Midseason Power Rankings: 49ers Dominant Defense Vaults Them to No. 1

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Video Rating:
TV-G
Video Duration:
1:09

We’re at the halfway mark of the NFL season and just one team stands alone without a loss: the San Francisco 49ers. The 8-0 Niners take this week’s crown in the latest SI.com NFL Power Rankings. SI’s Amy Campbell explains how their elite rushing attack and defense have fueled their hot start.