"It's good to start a series like that, after an off-day," said Arenado, whose run production helped the Rockies pass the D-backs for the lead in the National League Wild Card race. "We seemed a little sluggish in the first couple of innings and couldn't get any hits going, but that's also credit to Matz.
"But at the end of the day, it's always good to win games like this when they're close."
Both hits, which lifted Arenado's Majors-leading RBI total to 95, were impressive.
The three-run shot off Matz's full-count fastball landed in a tree in the home bullpen environment for just his third opposite-field homer this season. Matz had thrown a 3-1 curveball, so Arenado willed himself not to try to pull the pitch.
"I'm not trying to hit a homer to left-center or left field here," Arenado said. "I'm just trying to see it deep, and make sure I hit it hard. I saw it well, and I stayed back"