Phoenix, AZ (SportsNetwork.com) - Neil Walker and Josh Harrison drove in two runs apiece to power the Pittsburgh Pirates to a 4-1 victory over the Arizona Diamondbacks Friday in the opener of a three-game set.

Gerrit Cole (3-0) surrendered just one run on seven hits with seven strikeouts over 7 2/3 frames for his seventh straight winning decision.

"I keep trying to stay aggressive," Cole said. "The delivery stayed good for the whole game."

Chris Owings drove in Arizona's lone run and Josh Collmenter (1-3) was tagged with the loss after allowing three runs and six hits in six-plus innings of work.

"He was really good," Diamondbacks manager Chip Hale said of Collmenter. "I think he controlled the zone and moved his fastball where he wanted to."

The Pirates, who won their third straight game, got off to a quick start by scoring one run in the first inning and two more in the second.

Harrison kicked off the game with a single, stole second, moved to third on Andrew McCutchen's flyout and scored on Walker's base hit to right.

In the second, Harrison smacked a two-run RBI double to center and was thrown out at third on the play to end the inning.

Paul Goldschmidt and Yasmany Tomas each singled to place runners at first and second with two outs in the bottom of the sixth. Owings singled to second and Goldschmidt slid under Francisco Cervelli's tag at home for a 3-1 game.

McCutchen worked a two-out walk in the eighth and hustled home after Walker stroked a sharp liner to center for an RBI double.

Mark Melancon tossed a flawless ninth to earn his fourth save of the season.

Game Notes

Brad Ziegler recorded the final two outs over the seventh inning for his 253rd appearance with Arizona, tying Jose Valverde for the franchise's all-time record ... Walker extended his hitting streak to seven games ... McCutchen has safely reached base in 16 straight games at Chase Field ... The Pirates have won seven of their last 10 games in Arizona.