"Barry Zito took the mound for his first spring training start Monday and walked the ballpark. It wasn't exactly what the Giants had in mind, and here's a message to all those fans who have seen enough of Zito: He's walking a very fine line within the organization.

A source close to the team indicated Tuesday that there is "exasperation" with Zito, that his status as the No. 5 starter is "definitely not safe," and that the team would even consider buying out his expensive contract before Opening Day if that's what it takes to say farewell.

Zito has the rest of spring to either resurrect his worth to the Giants or show an opposing team that he'd be valuable in a trade, according to others familiar with the situation. Meanwhile, the Giants will take a close look at 16-year veteran Jeff Suppan (three shutout innings against Milwaukee on Monday), Class AA left-hander Clayton Tanner and other options for the No. 5 slot.

Heading into spring training, it was widely believed that the Giants were more than willing to ride it out with Zito, given the overall excellence of their rotation. But there's a healthy sense of urgency in the world champions' camp. They didn't clinch a postseason berth until the final game of the 2010 season, and they realize that just a single loss - something that could be avoided - could cost them a chance to repeat."