SAN FRANCISCO -- San Francisco Giants left-hander Madison Bumgarner has done a lot of things in his career.

Pitching a no-hitter is not one of them.

And despite six no-hit innings Monday night, it still isn't.

Bumgarner took a no-hitter into the seventh inning and combined with two relievers on a two-hit shutout as the Giants beat the San Diego Padres 2-0 in the opener of a three-game series.

Center fielder Angel Pagan's RBI single highlighted a two-run third inning against Padres right-hander Tyson Ross (1-3), providing Bumgarner all the offensive support he would need in avenging a 10-2 drubbing at the hands of San Diego on April 11.

"It's coming together. Finally," said Bumgarner, who has given up three runs in his last three starts after getting tagged for 10 in his first three. "All my stuff is feeling good."

Coming off a three-game interleague sweep of the Los Angeles Angels, the Giants (13-13) won a fourth straight game for the first time this season and reached .500 for the first time since the first week of the season.

The Giants have now won seven in a row at home.

Bumgarner (3-1) dominated a Padres team that had beaten the Giants three of four in San Diego in early April. The Padres had entered the game hitting .296 against left-handed pitchers, the second-best mark in the National League.

Giants manager Bruce Bochy knows full well his ace often is at his best when challenged.

"I know he was upset with himself in that start," he said of the April 11 debacle. "But it's really two different pitchers. I do think it gives him a little added incentive to bounce back and pitch a good game after a team gets him."

The Padres didn't have any hits off Bumgarner, the reigning World Series Most Valuable Player, until left fielder Justin Upton led off the seventh with a soft liner over the head of Giants shortstop Brandon Crawford for a single.

A single by first baseman Yangervis Solarte put the potential tying runs on base with no outs in the seventh, but Bumgarner retired the next three batters in order, two on strikeouts.

Asked afterward if he were nervous entering the late innings with a no-hitter, Bumgarner responded, "I haven't thrown a no-hitter, so I don't know. I was still a good ways away from that.

"I wasn't worried about losing a no-hitter or anything like that. I just wanted to get the next guy out."

He left after striking out pinch-hitter Austin Hedges, making his major-league debut, to start the eighth. Right-handers Sergio Romo and Santiago Casilla got the final five outs without allowing a hit.

Bumgarner, who threw 107 pitches, allowed only the two hits in his 7 1/3 shutout innings. He walked one and struck out six.

"He held us in check," Padres manager Bud Black said. "His stuff was overall better than in San Diego. We didn't really drive the ball."

Casilla, who pitched the ninth inning and survived the Giants' fourth error of the night, recorded his eighth save.

Pagan and first baseman Brandon Belt had two hits apiece for the Giants, who totaled eight hits.

Ross gave up two runs on seven hits in seven innings for the Padres, who were playing the opener of a nine-game trip. He walked three and struck out five.

"They didn't really hit him hard," Black said. "You pitch seven innings and give up two runs, we'll take it every time."

The only problems Bumgarner had early on came from the Giants' defense, which committed three errors in the first five innings. The left-hander had one himself on an errant pickoff throw after issuing a third-inning walk to Padres center fielder Wil Myers.

But Bumgarner pitched around the troubles by holding the Padres hitless over the stretch.

The Giants, meanwhile, had seven hits in the first four innings, but they turned them into just two runs. Both came in the third inning, one on a single by Pagan and the other on a bases-loaded walk by right fielder Justin Maxwell.

NOTES: The last time a Giants team recorded a shutout in a game in which they made four or more errors was as the New York Giants on June 19, 1933, against the Chicago Cubs. ... The shutout loss was the Padres' third of the season, two having come at the hands of San Francisco pitchers. ... The Giants stole a season-best three bases. ... For the fourth time in his six starts this season, Giants LHP Madison Bumgarner faced a lineup of all left-handed hitters (not counting the opposing pitcher). Arizona Diamondbacks OF Ender Inciarte is the only lefty-hitting non-pitcher to bat against Bumgarner this year. ... Before the game, the Padres purchased the contract of one of their top prospects, C Austin Hodges, from Triple-A El Paso and designated veteran C Wil Nieves for assignment. Hodges, 22, a second-round pick in 2011, had been hitting .324 for El Paso with two home runs and 15 RBIs. ... Giants RHP Sergio Romo was in Sacramento during the day to receive a Latino Spirit Award from the California Latino Legislative Caucus for community service. Romo was one of eight honored at the State Capitol.