Giants 8, Tigers 2: Pablo Sandoval homered and Jake Peavy didn’t allow an earned run in six innings as visiting San Francisco won the series opener against Detroit.

Brandon Crawford went 3-for-3 and Gregor Blanco had two hits and an RBI while the Giants racked up 15 hits overall. San Francisco survived a rain delay of two hours and 42 minutes while remaining within two games of Los Angeles Dodgers in the National League West.

Peavy (5-13) gave up two unearned runs and six hits in six innings to win for the fourth time in five starts. Tigers starter Rick Porcello (15-10) allowed six runs (five earned) and 10 hits in three innings as Detroit fell two games behind Kansas City in the American League Central and a half-game behind Seattle for the AL’s second wild card.

Sandoval had a run-scoring single in the first and the Giants tacked on three more in the second on Travis Ishikawa’s single, Angel Pagan’s infield out and Joe Panik’s infield single. Blanco lashed an RBI double and scored on Crawford’s single in the third to make it 6-0.

The rains came and Peavy continued after the long delay and gave up the two unearned runs in the fifth. Sandoval homered to right in the sixth.

GAME NOTEBOOK: San Francisco C Buster Posey went 2-for-5 and is 30-for-62 over his last 14 games. ... Tigers C Alex Avila missed his third straight game and manager Brad Ausmus said he won’t return until he’s free of concussion symptoms. … Giants OF Michael Morse (oblique) will likely miss the entire series after getting a cortisone injection for his injury.