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Preseason position review: Running game

From Florida State’s veteran line to Clemson’s fearsome defensive front, the ACC projects to have some of the country’s best position groups this fall, while a few other contenders will enter 2014 with some major question marks in key areas. With that in mind, we’re looking at the ACC’s best units, a few more that might surprise in 2014 and the top teams with holes that could keep them from an ACC title.

Previous installments of this series can be found HERE.

Next up: The running game

Best of the best: Florida State

There's plenty of competition for the top spot, but we're giving the edge to FSU's revamped ground game in spite of the losses of Devonta Freeman and James Wilder Jr. While the Seminoles said goodbye to two of their top runners, they return a senior-laden offensive line that has opened holes to the tune of 5.6 yards-per-carry last season, as well as a dynamic (if inexperienced) group of ball carriers. At the top of the depth chart, Karlos Williams tallied 730 yards and 11 TDs last season in a limited role, and his size/speed combination makes him as tough to bring down as any runner in the country. Behind him, Ryan Green and Mario Pender offer speedy alternatives, while true freshman Dalvin Cook oozes potential and could emerge as FSU's No. 2 option. Jimbo Fisher has made a point of distributing carries in recent years, so expect all four to see plenty of work.

Next up: Miami

It's easy enough to make a case for Georgia Tech (300 rush yards per game last year), Louisville (veteran offensive line and deep backfield) or Pitt (two 700-yard tailbacks returning), but we'll give the slight edge to Miami because there may be no more dynamic or productive runner in the conference than Duke Johnson. True, Johnson is coming off a severe ankle injury that cost him the final five games of 2013, but he's back and feeling good already, and he promises to be the foundation of the Canes' offense. With a healthy Johnson in the backfield last season, Miami averaged 5.4 yards per carry -- which would've been good for 13th nationally and third in the ACC.

Possible sleeper: North Carolina

Against FBS foes last season, North Carolina mustered a mere 148 yards per game on the ground -- good for 11th in the ACC. But that doesn't mean the ground game won't be a strength for the Tar Heels in 2014. In the early going, UNC mustered a meager 2.8 yards-per-carry and six TDs in its first seven games of the year (in which the Heels finished 2-5). After the calendar flipped to November, however, North Carolina's ground game flourished, averaging 5.1 yards-per-carry and scoring 13 times, while helping the Heels to a 5-1 finish. Now, T.J. Logan is back to lead a particularly deep corps of runners, and Marquise Williams is as good a threat to run as any QB in the league. If the offensive line can hold up, North Carolina's ground game should be vastly improved in 2014.

Potential problem: Virginia Tech

The Hokies' backfield was a disaster last season. Set aside the work of now-departed QB Logan Thomas, and the running backs tallied a mere 3.98 yards-per-carry last season and managed just 11 third-down conversions. Against FBS teams, Tech managed just 2.88 yards-per-carry, the ninth-worst mark in the nation. The eight teams that were worse had a combined record of 18-79. Now the Hokies add a first-year starter at quarterback, and the situation looks even more dire.