Milwaukee, WI (Sports Network) - Buster Posey hit a grand slam and recorded a number of firsts in a huge performance, and Tim Lincecum was dominant on the mound as the San Francisco Giants routed the Milwaukee Brewers, 15-2, in the continuation of a four-game series.
Posey, the fifth overall pick of the 2008 draft, homered twice and had four hits for the first time in his young career. He also drove in a career-high six runs.
Posey fueled the Giants' best offensive performance of the season. Andres Torres, Aubrey Huff and Posey homered in the first inning, and the four total home runs were a season high. The 15 runs were the most San Francisco has scored since May 13, 2007.
"It was a lot of fun," Posey said. "We just rolled tonight."
It was plenty of support for Lincecum (9-4), who struck out 10 and gave up one run in seven innings, a resounding rebound effort for the right-hander. He had given up eight runs in nine innings over his last two starts, both losses.
"Definitely this will help going into the All-Star Game," Lincecum said. "This was good for me to get stretched out. It was great to get that run support early."
Torres and Freddy Sanchez each finished with two hits and three runs batted in for San Francisco, which also won the first two games of this set and will go for the sweep Thursday.
Chris Narveson (7-6) was shelled in his worst start of the season, as he gave up 10 runs (nine earned) in 3 1/3 innings in the loss, Milwaukee's fourth in a row.
The rout began early as Narveson struggled with his location, leaving pitches up, and the Giants took advantage. Torres hit the second pitch of the game, a fastball up and in, to left-center for his fifth homer of the year.
Two batters later, Huff clubbed a high breaking ball to right to make it a 2-0 game. Following a Pat Burrell single, Posey drove a first-pitch fastball, which Narveson again left up in the zone, to left-center for his first homer.
It was the first time the Giants hit three homers in the first inning since August 22, 1999.
Rickie Weeks began the bottom of the third with a home run to center, but San Francisco responded with seven runs in the next half-inning.
Edgar Renteria and Eli Whiteside hit back-to-back leadoff singles, and a throwing error by Narveson on Lincecum's bunt loaded the bases with nobody out. After Torres flied out, Sanchez ripped a triple to right to make it 7-1.
Narveson continued to fall apart, walking Huff before throwing a wild pitch to allow Huff to move to second. The Brewers starter walked Burrell, once more loading the bases, and was removed as Chris Capuano entered into the dicey situation. Posey came up next and slugged a 1-1 slider to right field for a grand slam.
"Tonight they put a whipping on us," said Milwaukee manager Ken Macha. "I don't think anybody was pleased with what was going on tonight. They pretty much teed off on Narveson's fastball in the first inning. Then it looked like he was going to settle down like he's done before, but he ran out of gas. He's not making a strong case for himself when [Yovani Gallardo] comes back [from the disabled list]."
The Giants added four more runs in the sixth against Todd Coffey. Run-scoring singles from Renteria and Whiteside and a two-RBI double from Torres made it a 15-1 game.
Entering Wednesday's game, Posey had three career home runs and 13 RBI...Prior to Wednesday's game, Lincecum was 1-2 with a 5.67 ERA in five career starts vs. the Brewers...The Giants improved to 4-3 on their 11-game road trip, their longest of the season...The 15 runs allowed equals a season-high for Milwaukee, which also surrendered 15 runs in a May 21 loss at Minnesota.