SAN DIEGO (AP) - Every time his teammates closed the gap against the San Francisco Giants, Wade LeBlanc would give up another run.

Brett Pill hit a two-run homer in his first big league at-bat, Eric Surkamp earned his first major league win and the Giants had to escape a bases-loaded jam in the ninth inning to beat LeBlanc and the San Diego Padres 6-4 on Tuesday night.

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The defending World Series champion Giants pulled within six games of NL West-leading Arizona with 20 to go. The Diamondbacks lost 8-3 at Colorado.

``I felt OK,' said LeBlanc, who dropped to 3-1 with a 2.93 ERA in five career starts against the Giants. ``It was a disappointing game. We scored what should have been enough runs to win the game.

``I gave up runs and two times they answered for me, and then I gave it right back,' he added. ``That's the frustrating thing. I've got to figure out what makes me successful as a pitcher and get back to that.'

With the Giants leading 6-3, Javier Lopez walked Orlando Hudson on four pitches to open the Padres ninth. Santiago Casilla came on and got two outs before allowing rookie Anthony Rizzo's RBI double off the right-field wall. Casilla hit Cameron Maybin on the right elbow and hit Jason Bartlett on the left hand to load the bases.

Manager Bruce Bochy then turned to Ramon Ramirez, the sixth Giants' reliever, who struck out Jesus Guzman for his fourth save in five chances.

Surkamp (1-0) allowed three runs and five hits in five innings.

Carlos Beltran had three hits and three RBIs for the Giants, who won with three prospects in their starting lineup.

Pill's contract was purchased last Wednesday from Triple-A Fresno. Surkamp, called up from Double-A Richmond on Aug. 27, made his second big league start. Justin Christian started in center field and batted leadoff after his contract was purchased from Fresno on Tuesday. Christian appeared in 24 games with the New York Yankees in 2008.

With Mark DeRosa aboard on a leadoff single in the second, Pill hit an 0-1 pitch off the balcony of the third level of the Western Metal Supply Co. brick warehouse in the left-field corner at Petco Park and back onto the field. Padres left fielder Kyle Blanks tossed it into the stands, where a man grabbed it. Padres event operations supervisor Rob Arnold negotiated with the fan to get the ball for Pill.

Pill, who led the Pacific Coast League with 167 hits, started at first base.

Beltran, back after missing Monday's game with food poisoning, hit an RBI single in the third, an RBI double in the fifth and brought in another run with a grounder in the ninth.

San Diego's Nick Hundley hit a solo homer off Surkamp leading off the second. Rookie Andy Parrino got his first big league RBI on a sacrifice fly later that inning, and Kyle Blanks hit a sacrifice fly in the third.

LeBlanc (2-5) allowed four runs and eight hits in five innings.

``He probably could have gone another inning or two, but losing 4-3, we needed to get a run or two there against their lefty,' manager Bud Black said. ``And with a full bullpen is why we made the change.'

NOTES: Injured Giants LHP Barry Zito threw a four-inning simulated game. ``We'll see how he comes out of this and see if we need him for relief,' Giants manager Bruce Bochy said. ... The Padres recalled RHP Erik Hamren from Triple-A Tucson, and RHP Pat Neshek was outrighted to Tucson. He was designated for assignment on Thursday when the club claimed RHP Jeff Fulchino. ... Padres RF Chris Denorfia, who came off the DL on Monday, was hit in the head as he dove back into second base on a pickoff attempt in the second. He got up and took third before scoring on Parrino's sac fly. Will Venable hit for Denorfia in the fifth and stayed in the game in RF. ... The series concludes Wednesday afternoon when Giants RHP Matt Cain (11-9, 2.85 ERA) opposes Padres RHP Aaron Harang (12-5, 3.86). Cain is winless in three starts against San Diego this season, going 0-1 with a 4.05 ERA. Harang has gone 1-2 in his last three starts despite allowing only five earned runs.