The San Francisco Giants edged a step closer to the 2012 World Series title on Saturday night by posting a 2-0 victory over the Detroit Tigers at Comerica Park to go 3-0 up in the best-of-seven series.

Veteran pitcher Ryan Vogelsong continued his fine post-season form, throwing 5 2/3 solid innings with four walks and three strikeouts to keep the Tigers at bay on a chilly evening in Detroit.

Reliever Tim Lincecum and closer Sergio Romo saw the game out as San Francisco became the first team to achieve consecutive shutouts in the World Series since the Baltimore Orioles in 1966.

Gregor Blanco's go-ahead triple to right-centre and Brandon Crawford's RBI single - both in the second inning - proved decisive as the Giants moved within a game of clinching a second World Series crown in three years.

Vogelsong, who has overcome a string of injuries and personal setbacks in his career, was thrilled to have led his side to the brink of glory but warned there was still work to do.

The 35-year-old said on Fox Sports: "It was special before the night even started. Being able to pitch a game in the World Series... two years ago I never thought this would happen.

"I was pumped up to be out there tonight. It just feels really good to be finally out there in a World Series.

"But it's not over yet - we've got to win one more."

San Francisco will have the opportunity to clinch the crown on Sunday night when the teams contest game four.