Giants win on Posey’s big hit in ninth

PHOENIX — Buster Posey swung like old times Saturday night, blasting a ball to the furthest regions of Chase Field, a ground-rule double that bounced over the wall in right-center.

Posey was in a 4-for-36 funk when he walked to the plate in the ninth inning with the bases loaded. What’s worse was that he had three hits in 30 at-bats with runners in scoring position.

No worries, apparently. Posey’s double broke a 3-3 tie and gave the Giants a 5-3 victory over the Diamondbacks, leaving them one win from a four-game sweep.

The Giants loaded the bases when Conor Gillaspie singled, Denard Span was hit by a pitch and Joe Panik walked. With one out, Matt Duffy hit a grounder to first, forcing…