Williams got the first-team backfield work in Friday's preseason loss to Buffalo, Benjamin Raven of MLive.com reports.
With D'Andre Swift (groin) unavailable, Williams seemed to be the only RB the Lions used at the beginning of the game. Other backs obviously got work after the opening minutes, but Williams doesn't appear to have any competition for backup work this year. Swift is nearing a return to practice and should soon give the Detroit backfield a more explosive element after Williams produced just 15 yards on nine carries in his first appearance in a Lions uniform Friday night.