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Gerry Broome, Associated Press
Wake Forest's Zach Thompson tackles Duke quarterback Sean Renfree (19) during the second half of an NCAA college football game in Durham, N.C., Saturday, Oct. 22, 2011. Wake Forest won 24-23.

DURHAM, N.C. — Duke could be down to its last chance to defeat a nationally ranked team this season.

The Blue Devils' three victories this season have come against teams that have a combined record of 7-15, and Duke (3-4, 1-2) hasn't beaten a Top 25 team in nearly a decade.

That has added a little urgency to this week's preparations for No. 15 Virginia Tech (7-1, 3-1). None of Duke's remaining four opponents are in the national rankings.

Duke cornerback Ross Cockrell said Tuesday that "there's time left to make a move in the ACC."