Alexander is one of two sophomores on the list, and is joined in that category by Shawun Lurry of Northern Illinois. Other ACC players in the final 16 are Jeremy Cash of Duke and Jalen Ramsey of Florida State.
Alexander is one of the reasons Clemson ranks first in the nation in completion percentage defense (.432). Clemson is on pace to have the best completion percentage defense at the FBS level in eight seasons. The Tigers are also third in the nation in pass efficiency defense, fourth in the nation in total defense and seventh in scoring defense.
Alexander has not been a player opposing offensive coordinators have challenged over his 20 games as a starter. Last year, as a redshirt freshman, opposing quarterbacks completed just 20 passes in 57 attempts for 280 yards and two touchdowns against the man he was assigned to on defense. He was on the field for 766 plays, so opposing quarterbacks threw his way just once every 13 plays, or just 4,4 times a game. They completed a pass on his man just once every 38 plays he was on the field.
So far in 2015, opponents are avoiding him even more. In seven games, opponents have completed just four passes in 19 attempts against Alexander’s man. He has not allowed a touchdown pass in his last 16 games over two years.
Going head to head with Notre Dame’s Will Fuller, Alexander allowed the Notre Dame star to catch just one pass for 14 yards when he was guarding Fuller. Fuller had a 23-yard reception when Alexander was not involved in the play. Fuller’s two receptions against Clemson are his low total for his last 20 games.
The list of semifinalists include Alexander, Vonn Bell of Ohio State, Jeremy Cash of Duke, Vernon Hargreaves of Florida, Mike Hilton of Mississippi, Eddie Jackson of Alabama, Desmond King of Iowa, Jourdan Lewis of Michigan, Shawun Lurry of Northern Illinois, Adrian McDonald of Houston, Kevin Peterson of Oklahoma State, Jalen Ramsey of Florida State, Darian Thompson of Boise State and Tre’Davious White.