(San Francisco, CA)  --  Mike Yastrzemski led off the game with a homer as the Giants doubled up the A's 4-2 at Oracle Park.  Alex Dickerson added a homer in the second and Wandy Peralta pitched a perfect inning to get the win.  The Giants' Opening Day to the 60-game regular season is tomorrow night at Dodger Stadium while the A's open against the Angels on Friday in Oakland.