DENVER (AP) -It looks like 2007 all over again at Coors Field.

Todd Helton hit a two-run homer with one out in the ninth inning and the Colorado Rockies won their fourth straight game, beating the Pittsburgh Pirates 9-7 Saturday night.

The Rockies have won 15 of 16 overall. Two years ago, the Rockies suddenly went on a similar run to reach the World Series.

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``That's an incredible win right there, and incredible win,' manager Jim Tracy said. ``We obviously had to do some very special things to win.'

``There is a belief in this clubhouse we show up every day expecting to win,' he said.

The Rockies improved to 17-5 since Tracy took over for Clint Hurdle on May 29.

``We're doing some great things,' Helton said. ``We're playing well, pitching deep into the game and getting hits.'

Colorado's Chris Iannetta tied it at 7 with three-run homer in the eighth. Ian Stewart came within a single of hitting for the cycle and drove in three runs for the Rockies.

Huston Street (2-1) pitched a scoreless ninth for the victory. Colorado's Jason Hammel allowed five runs on eight hits in six-plus innings.

Andrew McCutchen hit a bases-loaded triple, Nyjer Morgan matched a career high with four hits and Brandon Moss added two RBIs on three hits for the Pirates, who have lost six straight at Coors Field.

``This was a tough loss, but we've already had a lot of tough losses this year,' Pittsburgh manager John Russell said. ``We swung the bats better tonight, but unfortunately our bullpen couldn't hold them.'

``Those things happen when you're going up against a hot team,' he said.

Trailing 7-4 in the eighth, John Grabow walked Brad Hawpe and gave up a two-out single to Carlos Gonzalez before Iannetta followed with a home run to center.

``I've not managed a club that had an eight hole hitter in the lineup that can hit a baseball that far,' Tracy said of Iannetta. ``I've not managed a club that had an offense that's performing and as deep as this one is when you have an offense like that it gives you an opportunity to come back in a situation like we were in tonight.'

Pinch-hitter Seth Smith singled off Jesse Chavez (0-3) with one out before Helton's drive into the Pirates' bullpen in right center field.

``He threw me a fastball, the same pitch he threw the pitch before,' Helton said.

Chavez acknowledged as much.

``I tried to come back inside with a fastball,' Chavez said. ``But I got it up and like the good hitter he is, he hit it out.'

The Pirates took a 6-4 lead with a four-run seventh inning highlighted by McCutchen's three-run triple. Moss added an RBI double in the eighth.

The Rockies led 4-2 after Stewart's two-run homer to straightaway center off Sean Burnett with one out and Tulowitzki aboard in the sixth.

Pittsburgh went ahead 2-1 in the third on Freddy Sanchez's RBI double into the gap in right after Stewart's RBI double. He added a triple in the next inning, scoring on an RBI single by Carlos Gonzalez.

``I think that you look at significant situations that allowed the heroics of Chris and Todd,' Tracy said. ``It comes down to this is a game that's won by the Colorado Rockies baseball team.'

NOTES: The walkoff home run was the first by Colorado this year. ... Rockies setup man Manny Corpas was placed on the 15-day disabled list due to inflammation caused by a floating bone chip his right elbow a day after receiving a cortisone shot and an MRI exam. ... Rockies LHP Greg Smith will make a rehab start on Tuesday for Double-A Tulsa. ... Morgan caught a foul ball while sitting on top of the wall along the left-field line in the third inning. ... Grabow moved into 10th place and third among all left-handers for the Pirates with his 376th appearance.