San Francisco, CA -- (Sports Network) - Ryan Sadowski got plenty of run support while throwing seven scoreless innings, as the Giants erupted offensively in a 13-0 whipping of the Astros.

Sadowski (2-0), who made his major league debut Sunday at Milwaukee and threw six shutout innings, allowed just three hits and a walk while fanning four for San Francisco, which was coming off a 5-5 road trip.

Nate Schierholtz and Edgar Renteria each contributed three hits to the onslaught, Pablo Sandoval added two more, including a homer and three RBI, and Travis Ishikawa belted a three-run homer for the victors.

"We don't do that very often, but the offense was there," said Giants manager Bruce Bochy. "(Sadowski) was good. He was outstanding. We had it all going tonight: offense, pitching. It was good to see the guys bounce back."

Houston starter Felipe Paulino (2-5) lasted just two innings, getting tattooed for nine runs -- eight earned -- on nine hits for the Astros, who lost the opener of this three-game set after taking three of four from San Diego.

"He just didn't have good location," Astros manager Cecil Cooper said of his starter. "[His] curveball wasn't as good as it was before. Probably got too many pitches in the zone. He didn't hit his spots very well and seemed like they knew what was coming the way they were swinging."

Sandoval got the rout started with a two-run homer in the first, scoring Randy Winn. Schierholtz followed with a single and later scored on a passed ball.

The Giants got more than they needed in the second. With two on and one out, Winn tripled to the gap in right-center for a 5-0 lead and came around on Schierholtz's two-out single. Renteria made it first and third with a base hit, and Ishikawa pounded an 0-1 changeup over the wall in right-center.

The three-run bomb was originally ruled a double, but instant replay was used and overturned the call to complete the six-run frame.

Jeff Fulchino toed the rubber in the home third and continued to serve as a punching dummy for the hosts. Aaron Rowand doubled with two outs, and the next four Giants recorded run-scoring hits.

Andres Torres hit a pinch-hit single, Sandoval followed with a triple and Schierholtz and Renteria capped the inning with a double and single, respectively, as the scoreboard ballooned to 13-0.

Sadowski allowed just one hit through six innings, and Jonathan Sanchez polished off the shutout with two scoreless frames of relief.

Game Notes

It was the first meeting of the season between the clubs...San Fran has won four straight as the host...Juan Uribe went 0-for-5 for the Giants, the only starting position player for the team not to register a hit...The Astros did not have any extra-base hits, compared to seven for the Giants...Following the game, the Giants optioned infielder Matt Downs to Triple-A Fresno and reinstated infielder Rich Aurilia from the bereavement list.