SANTA CLARA –- Cornerback Kenneth Acker is coming off a season in which he started 13 games.
At 24, his best football should be ahead of him.
But Acker is in a battle to merely win a roster spot with the 49ers due to a 90-man roster loaded with seven recent draft picks at his position.
"He's doing a good job for us at corner and we're also cross-training him at safety," 49ers defensive coordinator Jim O'Neil said Thursday. "He's had a great attitude every day. I'm not down on him at all. He's competing, and he's competing for a spot on this team.