Chacin and the Rockies were behind nearly from the outset. Eaton led off the first with an infield single, stole second and scored on Goldschmidt's single.
Chacin lasted a season-low four innings, allowing six runs — four earned — on seven hits with three walks.
"I just wasn't throwing strikes," Chacin said. "I was pitching up, overthrowing my pitches. I didn't make my pitches at any point in the game."
Culberson's first career pinch-hit home run pulled Colorado within 6-2 in the fifth. Matt Davidson hit his first career homer in the bottom half to make it 7-2.
Owings added an RBI single in the eighth.
NOTES: Rockies SS Troy Tulowitzki was 2 for 4 and has seven hits in past 14 at-bats. ... Colorado's D.J. LeMahieu flied out as a pinch-hitter in the seventh to end his career-best 14-game hitting streak. ... Arizona RHP Trevor Cahill (6-10), who is 3-0 in five starts since returning from the disabled list on Aug. 17, will face LHP Hyun-Jin Ryu (13-6) and the Los Angeles Dodgers on Monday night. ... Rockies manager Walt Weiss has not announced a starter for Monday's game against St. Louis.
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