Diamondbacks host Rockies before heading to Dodger Stadium (Jul 02, 2017)

PHOENIX — The Arizona Diamondbacks aren’t just competing with the Colorado Rockies this weekend. They’re also taking on adversity and, perhaps, the natural tendency to anticipate what might be ahead of them in two days.

With their 51-31 record, they’ve been told all season about how they’re overachieving, how they’re on pace for this franchise milestone or that personal achievement.

They also heard in advance of their 10-game homestand that wraps up Sunday against the Rockies that this was the time to make a real push to overtake the Los Angeles Dodgers in the NL West.

But instead of moving upward after winning four of the first five games in the homestand, they suddenly stalled — losing three…