SAN FRANCISCO -- Buster Posey and Madison Bumgarner are locked into long-term deals with the Giants, who intend to have Posey serve as the heartbeat of their lineup and Bumgarner as the ace of their rotation for the rest of the decade.

On Sunday, the duo took care of the immediate future, shooting the Giants into the All-Star break with more momentum than seemed possible over the past month. Posey and Bumgarner became the first battery to hit grand slams in the same game, driving in every run of an 8-4 win over the Arizona Diamondbacks.

The thriller sent the Giants, losers of 22 of their past 32, into the break at 52-43, one game behind the first-place Los Angeles Dodgers.

Players and coaches credited Posey for stirring a slumping group with his fifth-inning slam. The catcher was more impressed by Bumgarner, who also hit a grand slam April 11.

"You're just kind of shaking your head," he said. "I was asking Rags (pitching coach Dave Righetti) how many pitchers have hit two in one season."

The answer is two, in the entire history of major league baseball. Bumgarner joined Tony Cloninger, who hit two in one game against the Giants in 1966. Bumgarner joined Posey in giving the Giants two grand slams in the same game for just the third time in their San Francisco era.


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As he heads to Minneapolis for his second straight All-Star game, Bumgarner leads all MLB pitchers with a .275 average. His three homers are the most by a Giants pitcher since Don Robinson hit three in 1989, and his 12 RBIs are the most since Juan Marichal had 15 in 1966.

Asked how often Bumgarner talked about his plate prowess before Sunday's show, Posey smiled and thought for a moment.

"A pretty good amount," Posey said. "But he's got a reason to."

When Bumgarner settles into the All-Star clubhouse, only two hitters in the room -- Troy Tulowitzki and reigning MVP Andrew McCutchen -- will have a higher slugging percentage than Bumgarner's .550. He sits 12 points ahead of Miami Marlins right fielder Giancarlo Stanton, widely regarded as the most powerful player in the game, and just ahead of Diamondbacks star Paul Goldschmidt (.549).

"He's going to be hard to deal with in this locker room after two grand slams," joked Tim Hudson, who has the locker right next to Bumgarner's.

Posey made sure the rest of the clubhouse had nothing to worry about, getting the hit the Giants have been searching for over the past month. With two outs and the bases teeming, he crushed a fastball from Vidal Nuno to turn a one-run deficit into a 4-1 lead.

"I think it just kind of gave a sense of relief to the dugout," manager Bruce Bochy said. "We needed somebody to come through and ignite us, take some of the pressure off."

The Giants are 42-10 when they score four or more runs, and Bumgarner quickly doubled that number. A single, error and walk loaded the bases with no outs in the sixth, and Bumgarner pulled a first-pitch, 98 mph fastball from Matt Stites just over the left field wall. Bumgarner said he was geared up for the heat.

"Always. It's the only thing I can hit," he said.

Told that it was a changeup he hit for a rally-starting double an inning earlier, Bumgarner smiled.

"That was an accident," he said.

No matter how it happened, Bumgarner and Posey brought some life back to a lineup that was shut out five times over the previous 13 games. Without Marco Scutaro (sore after starting Saturday) and Brandon Belt (back tightness), the Giants still managed to get eight runs for the first time since June 1.

"This is a good way for us to go into the break," Posey said.

The players wasted no time bolting from the clubhouse Sunday evening, their destinations and plans varied. Posey just wants to relax, and the coaches are hopeful that four days off recharge his batteries enough that Sunday's slam is viewed as the beginning of one of Posey's patented hot streaks.

Bumgarner will surely spend most of Monday answering questions about his second grand slam, from fellow All-Stars and the horde of national reporters waiting in Minneapolis. He might look on wistfully during Monday's Home Run Derby, but more than anything, Bumgarner said, he'll look back. He gave up three runs after his homer and has been hit for 19 earned over his past four starts. As much fun as the 299th consecutive sellout crowd at AT&T Park had, Bumgarner wasn't able to fully enjoy his day.

"It might have been a little more fun had I not gone out and given up those runs in the seventh," he said. "I feel good, but I've got to get back on track."

In that way, Bumgarner is like 24 other Giants. They enjoyed a sunny Sunday at the park, but they know the feeling will wear off long before they report to Miami to begin the remainder of the season. Luckily, so will the bitter feeling from the month that preceded Sunday's win.

"We're still in a good spot, as poorly as things have gone for us the past month," Posey said. "We just have to go forward the last 70 games or so."

Friday's game
Giants (Madison Bumgarner 10-7) at Miami (Nathan Eovaldi 5-4), 4:10 p.m. CSNBA

Giants' two-grand slam games
The Giants hit two grand slams in a game for just the third time in the San Francisco era Sunday. A look at those games:
April 26, 1970, vs. Montreal Expos: Willie McCovey (1st inning off Bill Stoneman), Dick Dietz (8th inning off Carroll Sembera). Giants won 11-1.
Sept. 19, 1998, vs. Los Angeles Dodgers: Bill Mueller (3rd inning off Ismael Valdez), Jeff Kent (4th inning off Mike Judd). Giants won 18-4.
July 13, 2014, vs. Arizona Diamondbacks: Buster Posey (5th inning off Vidal Nuno), Madison Bumgarner (6th inning off Matt Stites). Giants won 8-4.
Note: Catcher Posey and pitcher Bumgarner became the first battery in MLB history to hit grand slams in the same game.