Former UA catcher Nick Hundley, making his major-league debut with the Padres, tags out Arizona's Stephen Drew in the sixth.

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PHOENIX — Cha Seung Baek threw six shutout innings for his first victory in seven starts this season, and the San Diego Padres beat the Arizona Diamondbacks 5-1 Friday night to drop the NL West leaders below .500.

Arizona (43-44) saw its lead over the Dodgers slip to a half-game, its narrowest margin since April 7.

The Diamondbacks reverted to their punchless form after a dramatic 6-5 victory over Milwaukee on Thursday, when they rallied from a 5-0 ninth-inning deficit.

"We did not look like we were rolling off the emotion of yesterday," manager Bob Melvin said.

Kevin Kouzmanoff had two singles and drove in a run for the Padres, who won for only the third time since June 14.

Baffling the Diamondbacks with sweeping breaking balls, Baek (2-3) took a bid for San Diego's first no-hitter into the sixth inning. Baek, a 28-year-old South Korean, allowed two hits, walked one and struck out seven, matching a career high.

"Change-up, cutters, everything was working great today," said Baek, who won for the first time in seven starts this season.

Baek walked Orlando Hudson with two outs in the first, then retired 15 straight.

Arizona did not come close to a hit until Stephen Drew doubled into the gap in right-center with two outs in the sixth. Justin Upton followed with a sharp single to left, but Drew was nailed at the plate on a perfect peg by left fielder Chase Headley.

For five innings, Arizona's Dan Haren (8-5) dueled Baek on even terms. But the Padres broke through in the sixth for two runs.

Haren allowed two runs and seven hits in seven innings, walking one and striking out seven. He said he was disappointed in the outcome but satisfied with his performance.

"I made most of my pitches," he said. "Ran into trouble there that one inning and I just tried to limit the damage. Unfortunately, they got those two runs. We closed back, but it got away from us at the end."

● Former Arizona Wildcat Nick Hundley made his major-league debut with the Padres at catcher.

● The D-backs recalled infielder Emilio Bonifacio and outfielder Alex Romero from Triple-A Tucson on Friday.

Arizona optioned right-hander Connor Robertson to Tucson and designated outfielder Jeff Salazar for assignment.