Though Jimmy Smith has the size and ability to be a starting cornerback for the Ravens, the second-year player must improve his technique.
Starting in place of Lardarius Webb, who is out of the season with a torn knee ligament, Smith was beaten badly twice by Houston Texans receiver Kevin Walter in Sunday's 43-13 victory.
"Jimmy played well, except for the double moves," coach John Harbaugh said of him vs. Houston. "He did a nice job, but you can't get beat on double moves. He knows that. That's going to be his issue going forward."
Webb was injured two weeks ago against the Dallas Cowboys, and Smith came in to fill the void as they held on for a 31-29 victory.
He was immediately burned by Miles Austin for what likely would have been a touchdown of 60-plus yards, but quarterback Tony Romo didn't look to that side of the field.
The defense is struggling overall to stop teams from having extended drives. The linebackers have been retooled since the Ravens lost Ray Lewis in the same game that Webb, their best cover corner, went down.
Smith, who at 6-2 a few inches taller and about 20 pounds heavier than Webb, tends to rely on his physical advantages in coverage, but Harbaugh would like to see him cover underneath and down field equally well. Corey Graham is used in nickel packages in Webb's place.
"You have to try to find a way to cover those stop routes but still be on top of the deep routes," Harbaugh said, going back to Smith's problems in the Texans game. "Corey did a nice job in the slot. He was solid in the slot and played well."