Arizona's Chris Burke throws to first base to complete a double play after forcing out San Diego's Nick Hundley, a former Wildcat. The play came during the sixth inning of the Diamondbacks' 7-6 victory over the Padres on Tuesday night.

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PHOENIX — Adam Dunn confessed he had some jitters before taking the field for his home debut with the Arizona Diamondbacks.

But any worries disappeared when Dunn hit his National League-leading 33rd home run — his first as a Diamondback — powering Arizona to a 7-6 victory over the San Diego Padres on Tuesday night.

"It's a good feeling to have," Dunn said. "Probably opening day and the opening day of deer season are about the only times I get butterflies."

Conor Jackson had two hits and two RBIs for the Diamondbacks, who have won four of five and six of eight.

Arizona starter Doug Davis (5-7) scattered seven hits over six innings for his first win since July 29, and his second win in his last nine starts. Tony Peña recorded the final two outs for his second save — and first since May 16 — in five chances.

"I ended up getting strike one more often tonight and was able to make them hit my pitch," said Davis, who has recorded three of five wins against the NL West.

Adrian Gonzalez had four hits and two RBIs for the Padres, who have lost five of seven.

Dunn, acquired by Arizona from the Cincinnati Reds on Aug. 11, made it 6-2 with a towering two-run homer in the fourth on a pitch Padres starter Josh Banks said he "tried to bounce." Dunn tied Philadelphia's Ryan Howard for the NL lead and moved within two homers of Carlos Quentin of the Chicago White Sox for the major-league lead.

"I knew it was going to come, and my homers come in bunches," Dunn said.

San Diego made things interesting in the ninth against Diamondbacks closer Brandon Lyon, who has struggled in non-save situations over the past month.

Trailing 7-3 entering the inning, Edgar Gonzalez doubled, Brian Giles drew a one-out walk and Kevin Kouzmanoff singled to right to load the bases. Adrian Gonzalez followed with a sinking line drive to center, scoring his brother and Giles to pull the Padres within 7-5.

Chase Headley then singled to right to make it 7-6.

"I don't think he's a guy who needs the emotional lift or adrenaline rush of a save situation," Arizona manager Bob Melvin said of Lyon, who allowed three runs to raise his ERA to 4.60. "He's just being a little bit fine with the fastball."

Lyon, pitching for the first time in nearly a week, gave way to Peña, who threw out Adrian Gonzalez at home on a fielder's choice and retired Nick Hundley on a fly ball to center to end the game.