The Giants are willing to trade left-hander Jonathan Sanchez in an effort to free up money to spend on offensive upgrades, according to sources. San Francisco has one of the best and most expensive starting rotations in all of baseball. One rival executive projected that, including salary arbitration awards, the team's six returning starters -- Sanchez, Matt Cain, Tim Lincecum, Ryan Vogelsong, Madison Bumgarner, and Barry Zito -- could combine to earn as much as $60 million in 2012. Therefore, if the Giants are to sign a significant hitter while maintaining a payroll around $120 million, they will probably need to part with one current starter.