OAKLAND, Calif. -- The game was billed as a nostalgic pitching matchup between San Francisco right-hander Tim Hudson and Oakland lefty Barry Zito, but Giants rookie left fielder Jarrett Parker stole the show Saturday afternoon at the O.co Coliseum.

Parker hit three home runs, including a grand slam, to power the Giants to a 14-10 victory. He's the first rookie in franchise history to hit three home runs in a game. He's also the first Giant to have three homers and seven RBIs since Willie Mays hit four home runs and drove in eight on April 30, 1961 in Milwaukee.

"It's the best offensive game I've ever seen in person," Giants manager Bruce Bochy said. "I've seen three home runs but to hit a grand slam with the game tied, just an amazing day for this kid."

The defending World Series champion Giants pulled within 7 1/2 games of the Los Angeles Dodgers in the National League West and kept their slim playoff hopes alive.

Parker hit a solo shot in the second inning off Zito, a two-run blast in the seventh off left-hander Drew Pomeranz and a grand slam in the eighth off right-hander Ryan Dull, giving him six home runs for the season - all since being recalled Sept. 11 from Triple-A Sacramento.

"I tried to keep it simple, just trying to be aggressive and stick to my game plan," Parker said. "Three home runs, I don't think I've done that before. That's pretty wild."

Parker's slam capped a five-run eighth inning and put the Giants ahead 14-10.

The Giants pulled even at 10 when rookie second baseman Kelby Tomlinson hit a leadoff single, moved to second on first baseman Buster Posey's double to right that got past a diving Josh Reddick and scored on right fielder Marlon Byrd's sacrifice fly.

Parker, who hit a monstrous home run off Dull on Friday night, sent Dull's first pitch into the right field seats.

"He'd just walked a guy on four pitches before, so I knew he was going to try to get ahead," Parker said.

Designated hitter Billy Butler hit his 15th home run of the season for Oakland, a two-run shot in the sixth.

Tomlinson had four hits and scored three runs for the Giants, who totaled 19 hits. Catcher Trevor Brown had three hits.

Neither Zito nor Hudson, who are former A's teammates, figured in the decision.

The 40-year-old Hudson lasted only 1 1/3 innings, his shortest outing of his final major-league season. He gave up three runs (two earned) and one hit, walked three, struck out none and hit two batters.

Hudson came off the field to a standing ovation and received an even louder and longer standing ovation between innings when he made a curtain call, patting his heart in appreciation.

"Things didn't work out how he and I wanted them to with our performances, but the fans were awesome," Hudson said. "They really showed their appreciation for what we've been able to do over the years."

Zito, who was called up Sept. 16 from Triple-A Nashville, gave up four runs and six hits in two innings. He left to a standing ovation after walking Posey to lead off the third. Zito called the experience "surreal."

"I couldn't believe I got to be on the field in an A's uniform and receive an ovation," Zito said. "When I had last pitched in the major leagues I had thought there may never be another time on the field, let alone for the Oakland A's. That was just so special to be out there and have those fans give me some love and just to be on that mound."

Zito, who played seven seasons for the Giants, made his curtain call between innings to another standing ovation.

The Giants struck for two runs in the first against Zito. Tomlinson and third baseman Matt Duffy hit back-to-back singles with one out, and Byrd brought them home with a two-out double high off the right-center field wall.

The Giants made it 4-0 in the second. Parker sent Zito's 2-2 pitch over the left-center field fence for a solo shot with one out. Center fielder Angel Pagan roped a two-out double to left center and scored on Tomlinson's sharp single to center.

Oakland answered with three runs in the bottom of the second without the benefit of a hit. Hudson walked three batters and hit two, and Duffy committed an error. The A's scored five times in the third, sending 11 batters to the plate and building an 8-4 lead, but the Giants roared back behind two more Parker home runs.

"He was the difference in the game, no doubt about it," A's manager Bob Melvin said of Parker. "We tried righties, we tried lefties. We tried a little bit of everything. Sometimes you just get a guy that's swinging the bat hot."

NOTES: A's rookie C Carson Blair will have season-ending surgery to repair a torn meniscus in his left knee, manager Bob Melvin said. Blair had pain and swelling in his knee Thursday and had an MRI exam on Friday, which revealed the damage. ... During their pregame work, Giants players, coaches and manager Bruce Bochy wore No. 17 shirts with Tim Hudson's name on the back, honoring the right-hander before his start against A's left-hander Barry Zito. "He's so popular with this club," Bochy said of Hudson. "Guys are having fun with it today. It's in honor of Huddy and his career and his time spent with us." ... A's RHP Sonny Gray said his left hip was sore Saturday, the day after his start against San Francisco. The A's have not yet decided whether Gray will make his final scheduled start of the season. ... Former A's pitcher Mark Mulder, once part of the team's "Big Three" along with Zito and Hudson, attended the game and will take part in a pregame ceremony Sunday when all three will be honored. "A lot of those years we were so young and kind of immature, but we knew we were good," said Mulder, a baseball analyst for ESPN. "It wasn't just the three of us, it was the whole team in those early 2000 years."