Freddy Sanchez done for season, Giants career over?

Freddy Sanchez's 2012 season is over before it even starts. He underwent back surgery Thursday, Hank Schulman of the San Francisco Chronicle reported.

Sanchez signed a $6 million extension covering the 2012 season on April 1st, 2011. Given the large uphill battle he faces with rehab from the surgery, his career with the Giants -- and potentially all of baseball -- could be over. 

Sanchez hit .290/.333/.387 in two-plus years as a Giant.