Giants go deep in win

Ross also singled, doubled and scored three times to back a solid outing by rookie Eric Surkamp.

The setting was a lot different than a year ago at this time when these teams battled for the NL West title in a race that went down to the final day of the regular season.

The Giants still harbor slim postseason hopes this year — they began the night 8 1/2 games behind division-leading Arizona — while the Padres are just finishing out the string.

San Francisco, the majors’ lowest-scoring team since the All-Star break, put up eight runs for the second straight game. It’s the first time the Giants have done that in back-to-back games since the first two games of the 2010 World Series.

Most of the offense came from San Francisco’s big three of Beltran, Ross and Sandoval.

Beltran went 2 for 4 and drove in two runs, Ross added a pair of RBIs and Sandoval capped the night with a towering, three-run homer in the seventh. It’s the first time the Giants have hit three home runs in a game at their waterfront ballpark since Sept. 30, 2010.

Surkamp (2-0) pitched 5 2-3 innings for his second major league victory — both coming against San Diego. The left-hander, who beat the Padres on Sept. 6, allowed seven hits and walked one.

That might be enough to keep the 24-year-old in the Giants’rotation. Barry Zito, who has two years remaining on the $126 million deal he signed before the 2007 season, came off the disabled list Sunday but will most likely work out of the bullpen unless one of the other starters gets hurt.

One day after scoring eight runs in a win over the Dodgers — the most runs by the Giants in more than a month — the defending World Series champs matched it against the Padres. Beltran provided early offense when he snapped an 0-for-15 skid with a two-run shot off Aaron Harang in the first. The ball easily cleared the wall in right field, bounced on the cement landing and fell into McCovey Cove.

It was Beltran’s 18th home run of the season and third since being traded from the Mets to San Francisco on July 28.

Ross homered leading off the third, then added an RBI single in the seventh. Sandoval put the game out of reach with his three-run drive off reliever Andrew Carpenter.

Harang (13-6), who was 4-0 in six previous starts against the Giants, left after the fifth. He allowed six hits and struck out four.

San Diego, which fell to 1-4 on its seven-game road trip, scored a run in the fourth with the help of Surkamp’s throwing error, then added two more in the sixth on four consecutive two-out singles to chase the San Francisco rookie.

Kyle Banks knocked in one run and Orlando Hudson singled in Chris Denorfia to cut the lead to 4-3.

San Diego put two runners on in the eighth but failed to score.

Sergio Romo, the fifth San Francisco pitcher, got Hudson to hit into an inning-ending double play, then retired the side in the ninth.