Chris Young of the Diamondbacks slides safely into second with a stolen base in the seventh inning as Omar Vizquel makes a late tag.

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SAN FRANCISCO — Dan Haren took the mound knowing he needed to get Arizona off to a strong start in what has shaped up to be a key stretch for the NL West-leading Diamondbacks.

Haren did his part — and so did the offense.

Mark Reynolds hit a three-run homer, Conor Jackson and Chad Tracy also connected, and the D-backs gave Haren plenty of early run support in a 10-2 victory over the San Francisco Giants on Friday night.

"It's a very important road trip for us. Everyone knows it," Haren said. "It's nice to set the tone and start off on the right foot, and hopefully go on from here. I had a little extra adrenaline coming out at the beginning of the game and felt good in the bullpen, which isn't always the case."

Stephen Drew and Chris Young hit two-run doubles in Arizona's five-run second inning, when the Diamondbacks batted around against Jonathan Sanchez (8-6) and collected four hits, three of them doubles. Chris Snyder singled in the other run that inning, and Jackson had a double.

Haren (10-5) matched his season-high with nine strikeouts with no walks in eight innings to win consecutive starts for the first time this month. He allowed nine hits and two runs.

Arizona quickly showed why it is atop the West, despite the division's poor record this year. The D-backs ended the Giants' momentum after San Francisco took three from the Washington Nationals for the club's first home sweep of the season.

Both teams considered this a crucial series — and the Diamondbacks began a stretch of 10 straight division road games in impressive fashion.

With Arizona leading 6-1 in the seventh, Reynolds hit the first pitch from rookie Geno Espineli over the wall in center for his 20th homer. Tracy followed with his sixth homer to chase Espineli, who earned his first major-league win Wednesday in his second career outing.

"To put up 10 tonight is huge for us," Reynolds said. "You get guys on base and anything can happen. That's what we've been doing. We're doing the little things."

Arizona hit consecutive home runs for the second time this year. Justin Upton and Reynolds did it on May 31 at Washington.

Jose Castillo singled in the Giants' first run in the fifth, and Fred Lewis added an RBI single in the seventh.

"I thought we had some pretty good at-bats," Giants manager Bruce Bochy said. "We created a couple of good opportunities. We just let the game get out of hand."

Haren, who won his last decision after a three-start winless stretch, added a double to his cause for his seventh hit in 45 at-bats this season.

Acquired by Arizona in December from Oakland, Haren made his first start in the Bay Area since the swap.

Haren allowed two or fewer earned runs for the eighth straight start as the D-backs improved to 6-10 over their last 16 road games.

"Danny, that's pretty much what we see every time from him," Arizona manager Bob Melvin said. "We've had some games we really thought would give us some momentum, and games we thought would take the momentum away from us.

"We've got to follow it up tomorrow."