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Cassius Vaughn: C-
Vaughn was abused by Calvin Johnson on the day, as he just doesn't have the physical strength to matchup with Megatron. But, I put that more on the coaches than on the cornerback. Overall, Vaughn wasn't good, but was better than I expected, with decent coverage, nine tackles, and two passes defended.
Antoine Bethea: A-
Bethea was all over the field against the Lions, actively getting into the backfield and disrupting things, as well as making plays in coverage. He finished with six tackles and two passes defended.
Joe Lefeged: C-
Lefeged wasn't quite as bad as Zbikowski in run support, but he wasn't much different in coverage, and overall went most of the game unnoticed. His lack of action on Calvin Johnson's 46-yard touchdown pass was abysmal.
Vontae Davis: B-
Davis got beat by Johnson a couple times on the day as well, notably on the 46-yard touchdown. I can't put the blame on him for that though, as he had on safety support against the best deep threat in the league. For most of the game, Davis had tight coverage and tackled well.