49ers' Tramaine Brock getting his chance

SANTA CLARA, Calif. -- Tramaine Brock will get another opportunity to show he belongs as the No. 3 cornerback of the San Francisco 49ers on Sunday.

Brock excelled last week at St. Louis when he played for an injured Nnamdi Asomugha. He is still coming back from the injury. Because Brock played so well, there is no rush. If Brock continues to play well, I could see a scenario in which he stays the No. 3 cornerback. Younger legs and better tackling would be Brock’s ticket over Asomugha.

San Francisco defensive coordinator Vic Fangio spoke highly of Brock on Thursday.

“He did a nice job,” Fangio said of Brock’s work against the Rams. “He probably had the biggest play of the game in breaking up that pass that Donte (Whitner) intercepted in the end zone. That was a third-and-1, deep into the second quarter. They were in field goal range and I think the score was only 7-3 at the time. So, that was a very critical play at that time and he made that. And he made some other good plays.”

In other 49ers’ notes:

  • 49ers’ No. 1 receiver Anquan Boldin turned 33 Thursday. He has 24 catches this season. No receiver older than him has more catches, although San Diego tight end Antonio Gates has 25 catches. He turned 33 in June.

  • Offensive coordinator Greg Roman said Jon Baldwin will have a “substantial role” Sunday. Baldwin will likely start. “I think it’s all about opportunity and I think the opportunities that he was given last week, shoot I was very encouraged by it,” Roman said of Baldwin, who had two catches in his 49ers’ debut last week “I love to see guys play physical and make plays when opportunities come their way. I’m sure he’ll be getting plenty of opportunities this week and he’s got to take advantage of them.”