The Diamondbacks were trailing 4-3 in their final at-bat when Didi Gregorius collected a lead-off single against Wilton Lopez (0-1) and Pollock sent him to third with a double.
Pinch-hitter Alfredo Marte drove in Gregorius with a groundout, sending Pollock to third, and Parra's fly to deep center field allowed him to come home with the decisive run.
Gregorius also smacked a solo homer for the D-backs, who avoided a three-game sweep at Coors Field.
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