Dave Preston is an AP Top 25 voter. Read his ballots here .

It’s easy to break down a football game as a tale of two halves, and sometimes one half looks nothing like the other.

Witness what happened in Raleigh and Blacksburg Saturday: Virginia and Virginia Tech each had double-digit leads at intermission, and those leads evaporated in the September air as both the Cavaliers and Hokies had no defensive answers for their opponents. Meanwhile, Navy turned things on defensively to pitch a second half shutout after allowing UAB to score on every first half drive.

Two other second halves of note: No. 8 Clemson rallying from 16 points down against Troy to avoid an 0-2 start, and a Dabo Swinney press conference to remember forever, while unranked South Florida stayed with and shocked No. 13

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