Giants second baseman Freddy Sanchez has undergone left shoulder surgery and might not be ready by Opening Day. San Francisco manager Bruce Bochy confirmed to The Associated Press on Thursday night that Sanchez had a recent arthroscopic procedure. "He's going to be a little delayed," Bochy said in a phone interview. "It'll be close if he can go opening day or not." Sanchez had left knee surgery late in the 2009 season.