Denver, CO -- (Sports Network) - Jorge De La Rosa blanked the Diamondbacks through eight innings, and Joel Peralta and Huston Street finished off Colorado's 5-0 shutout of its NL West rival.

De La Rosa (5-7) won his third straight start by giving up just four hits and four walks while striking out six. Peralta and Street combined to hurl a perfect ninth for the Rockies, who were coming off a 5-4 road swing.

"There was a point in time in the game tonight when (De La Rosa) was throwing four pitches for strikes," Rockies manager Jim Tracy said. "And if you're an offensive player, having to deal with that is a monumental task."

Chris Iannetta and Troy Tulowitzki each had two hits and an RBI, and Ian Stewart added a solo homer for the victors.

Max Scherzer (5-6) suffered the loss, allowing five runs -- three earned -- on six hits and a walk, adding five strikeouts in his six-inning start for Arizona, which had almost as many errors (three) as hits (four).

The D-Backs have now lost eight of their last nine.

"You can have all the rah-rah speeches you want and all the team meetings you want and yell at guys, but guys have got to give a damn, and I just don't see it," Arizona's Mark Reynolds said.

Stewart's two-out homer made it 1-0 in the second inning, and the Rockies added a pair of runs in both the fifth and sixth frames to pull away.

Iannetta singled to open the fifth and came around to score on a two-out double by Dexter Fowler, who hustled home on Gerardo Parra's throwing error.

Parra had a chance to redeem himself with a bases-loaded opportunity in the sixth but grounded into a fielder's choice to end the threat.

Tulowitzki doubled in Todd Helton in the bottom half and made it 5-0 by scoring on Iannetta's sacrifice fly later in the frame.

Game Notes

The game was delayed 22 minutes for rain...Colorado, which kicked off a 10- game homestand has won six straight at Coors Field.,,The Rockies lead the season series 4-3. The D-Backs went 15-3 against the Rockies last season, including a 7-2 mark in Denver.