PHOENIX — Speed and a terrific bullpen breathed a bit of life into the playoff hopes of the San Francisco Giants.

Pinch-hitter Fred Lewis beat out a double-play grounder with the bases loaded to drive in the go-ahead run in the eighth inning and five relievers shut down Arizona in the Giants' 5-4 victory over the Diamondbacks last night.

"Thank goodness for speed," San Francisco manager Bruce Bochy said. "That's a pretty routine double play ball for anyone else."

The victory moved the Giants within four games of idle Colorado in the NL wild-card chase with 12 games to play.

Speed was the reason Bochy had Lewis pinch-hit for Kevin Frandsen, who played second base after Freddy Sanchez twisted his left knee and left the game in the first.

When Lewis hit the sharp bouncer to second, he knew what he had to do.

"I was just trying to get down the line as fast as possible," he said.

Sergio Romo (5-2) pitched two-thirds of an inning to get the victory.

Jeremy Affeldt threw a scoreless eighth for his major league-leading 32nd hold. Brian Wilson allowed a two-out single to Stephen Drew in the ninth, then struck out Upton looking on a 3-2 pitch for his 35th save.

Mark Reynolds drove in two runs with his 43rd homer of the season and Justin Upton's single scored the other two for Arizona.

Pablo Sandoval doubled and singled for the Giants, who took advantage of three Diamondbacks errors.

The Giants' runs came on a single, an Arizona error, two groundouts (including Lewis') and a sacrifice fly.

Manager A.J. Hinch called it "a night of really, really poor execution" by the Diamondbacks.

"We had two bunts on offense we didn't get down, we had three errors, numerous leadoff walks. It's not winning baseball," he said.

BRAVES 11, METS 3:

Chipper Jones homered and drove in four runs to lead visiting Atlanta. Garret Anderson and Matt Diaz also connected for the Braves, who have won nine of 11 to keep a grip on their faint playoff hopes.

CUBS 10, BREWERS 2:

Derrek Lee and Aramis Ramirez hit back-to-back homers in the second and Tom Gorzelanny tied a career high with nine strikeouts for visiting Chicago. Gorzelanny (6-2) allowed two runs in five innings.

PADRES 11, PIRATES 6:

Chase Headley's career-high fifth hit of the game drove in the go-ahead run in the 11th inning for visiting San Diego. Headley hit his third double of the game in the 11th off Jeff Karstens (3-5) to drive in Everth Cabrera.

ST. LOUIS 7, HOUSTON 3:

Mark DeRosa homered twice and host St. Louis beat Houston. DeRosa also had a two-run double for the Cardinals, who reduced their magic number for winning the NL Central to three.