Virginia Tech has done a lot of impressive things on the football field in recent years, but nothing has been as good as the job the Hokies have done in pass defense through four games in 2009.

Defensive coordinator Bud Foster has always been a genius when it comes to disguising coverages and making opposing quarterbacks look silly, but this year he's taking it to a new level. Tech has played some good quarterbacks so far, and here are the numbers they have put up against the Hokies.

The completion percentage of opposing quarterbacks has gotten progressively worse through each game. Greg McElroy of Alabama started the season by completing 50% of his passes. That's not a great number, but it's the best anyone has managed against Virginia Tech this year.

McElroy also had 230 yards passing, which is the highest total any player has put up against Tech. He also has the only touchdown pass thrown against the Hokies this year.

Zac Lee and Jacory Harris of Miami had been putting up huge numbers before they came to Blacksburg and ran into Bud Foster's defense. In fact, all of these players have fared very well this season, except when they've played the Hokies.

Opposing quarterbacks have an efficiency rating of 84.8 against the Hokies. Against other teams, their efficiency rating is 176.7. That number would rank third in the nation, if one player put up those statistics.

Wrap your head around those numbers for a moment. Virginia Tech has thoroughly dominated a group of players who, on the whole, haven't been stopped by anyone else. Brian Anderson of Marshall hasn't put up great numbers against 1-A teams, but there's no questioning the ability of Greg McElroy, Zac Lee and Jacory Harris.

For the most part, the Hokies have already faced the best quarterbacks they will play this year.

Future opponents have a quarterback rating of 127.12. That's good enough (or average enough) to be 68th nationally in pass efficiency.

Of course, much of that is because of NC State sophomore phenom Russell Wilson. Take Wilson out, and the efficiency rating for the others is 119.99, which would rank 82nd in the nation.

Virginia Tech's pass defense has been dominant so far, and considering the upcoming competition, it could get even better.

Right tackle Blake DeChristopher is listed as probable on Virginia Tech's injury report, but he will not start the Duke game. Instead, r-sophomore Andrew Lanier will get the first start of his career. DeChristopher is battling an ankle injury suffered during the Miami game.

Lanier got 13 snaps against Miami in relief of DeChristopher. He also played 16 plays against Marshall. Offensive line coach Curt Newsome has been excited about Lanier's progress, and now he'll get a chance to prove it on the field against the Blue Devils.

Three other Hokies are also listed as probable: rover Davon Morgan (shoulder), wide receiver Dyrell Roberts (hamstring) and defensive tackle Demetrius Taylor (calf).