The Angels are under extreme pressure to re-sign Zack Greinke, who they acquired at midseason in a trade with the Brewers.

Los Angeles traded Ervin Santana to the Royals this past week and declined the $15.5 million option on Dan Haren's contract on Friday, making him a free agent.

In doing so, the Angels have only Jered Weaver and C.J. Wilson as locks for their starting rotation in 2013.

"We're not isolated on Zack Greinke as a stand-alone," Jerry Dipoto said. "There are a lot of pitchers out there on the open market."