(Phoenix, AZ)  --  David Peralta hit a walk-off, RBI-single in the bottom of the ninth inning to lift the Diamondbacks past the A's 4-3 in Phoenix.  Robbie Grossman homered for Oakland, which saw its four-game winning streak come to an end.  Joakim Soria took the loss.  Frankie Montas gets the start today in Phoenix for the A's.