The Giants' Guillermo Quiroz, (12) hits a three run home run in the seventh inning driving in Joaquin Arias, (13-left) and Gregor Blanco, (7) as the Oakland Athletics went on to beat the San Francisco Giants 4-3 at the O.co Coliseum in Oakland, Ca. on Saturday Mar. 30, 2013. Photo: Michael Macor, The Chronicle