Tramaine Brock continues to shine

SANTA CLARA, Calif. -- Tramaine Brock keeps answering every challenge.

When the season began, it seemed Brock could be going into his last with the San Francisco 49ers. He had promise, but he never developed the way the team wanted him. In camp, he was a special teamer, who looked like he'd leave as a free agent in 2014.

Now, he is showing the 49ers he was well worth the investment as a long-time starting cornerback.

As he did when he became the nickel cornerback in Week 4 when Nnamdi Asomugha got hurt (Asomugha has since been released), Brock has positioned himself well after replacing an injured Tarell Brown three weeks ago. Brock was terrific as the nickel cornerback and has continued to play well in his first three games as a starter. The 49ers have to feel great about giving him a four-year, $16 million extension last month.

Brock is showing he can be a quality starter. In fact, there is likely little chance he will give up his starting job the rest of the season. San Francisco defensive coordinator Vic Fangio continued to say Thursday that Brown, who is now healthy after suffering a ribs injury at New Orleans, will be eased back into the lineup.

“I just trying to make plays and take advantage of the position I'm in,” Brock said. “It's a big season for me. It's worked out well.”

The 49ers can say the same thing.