MLB: San Francisco 3, Houston 2

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HOUSTON, Aug. 28 (UPI) -- Pinch-hitters Joaquin Arias and Hector Sanchez each delivered run-scoring hits in the ninth inning Tuesday, rallying San Francisco past Houston 3-2.

The Astros had broken a 1-1 tie in the eighth when Ben Wallace scored on a wild pitch by San Francisco starter Matt Cain, but the Giants got him off the hook with a clutch rally in the ninth.

Brandon Belt led off with a single against Fernando Rodriguez. Wilton Lopez (5-3) then came in to pitch, and Arias -- batting for Gregor Blanco -- greeted him by smacking a double into the left-field corner, producing a 2-2 deadlock.

Sanchez then came up for pitcher Santiago Casilla (5-5) and blooped a single to center field, chasing home Arias with decisive tally.

Sergio Romo garnered his seventh save with a 1-2-3 bottom of the ninth for the National League West-leading Giants, who took the opener of a three-game series.

Cain had held the Astros to two runs on six hits over 7 1/3 innings.

Houston starter Bud Norris limited the Giants to one run on six hits over 6 2/3 frames, striking out seven.