SAN DIEGO, July 9 (UPI) -- Wilin Rosario's two-run double in the first inning got Colorado off to a fast start Monday and the Rockies handed San Diego a 10th straight loss, 4-2.
That brought up Rosario, who smacked a 1-0 into the left-center field gap, sending both runners home for an early lead the Rockies wouldn't relinquish.
Colorado added two more runs in the sixth on a throwing error by Volquez and a Dickerson sacrifice fly en route to a victory in the first of a three-game set.
Tyler Chatwood (5-2) went 6 2/3 innings to notch the decision, yielding two runs on five hits. He allowed three runs and struck out four.
Volquez (6-7) was tagged for four runs on eight hits over 5 1/3 frames as the Padres remained winless in July.
Everth Cabrera and Kyle Blanks each drove in a run for San Diego.