SAN FRANCISCO — With one swing, Brandon Crawford sank the sinking Rockies even deeper in their slump.

The Giants’ shortstop blasted a 365-foot moonshot homer to right field off rookie Harrison Musgrave in the bottom of the ninth, a ball that just got over the wall to give San Francisco the 1-0 win and send Colorado to its fourth straight defeat.

“It was a slider that kept middle up — good hitters can hit that out of the park, and that’s what happened,” Musgrave said. “I was calm emotionally but just didn’t execute the pitch. You get punished (in the majors) for stuff like that.”

Crawford’s walk-off ended a pitching clinic Wednesday night at AT&T Park, when Giants veteran Madison Bumgarner and Rockies sophomore Kyle Freeland went toe-to-toe for seven innings of shutout baseball.

“It was a great matchup between two lefties — one just starting his career and getting his feet on the ground, and Bumgarmer obviously we know what he’s done in his career,” manager Bud Black said. “It was impressive from Kyle in terms of the changeup usage, keeping the ball down, enough inside to keep the righties honest, changing speeds, sinking the ball.”

Boxscore

The southpaws handed the game over to the bullpens in the eighth, and after Scott Oberg was able to produce four outs for the Rockies, Musgrave came on and immediately yielded the deciding homer to Crawford.

It was a big stage for a left-hander who began the year as a starter in Triple-A Albuquerque, was called up April 23 and has since worked his way into higher-leverage situations.

“He’s pitched great — you look at the batting average against (lefties at .167), you look at his poise, you look at what he’s done,” Black said. “He’s growing too as a pitcher, and we liked the

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