If Adam Dunn was feeling a little nervous before his first game in front of the Diamondbacks' home fans who expect his arrival to tip the NL West race in Arizona's favor, it didn't show.

Dunn hit his first homer for Arizona in a 7-6 win 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."

The Los Angeles Dodgers tried to balance things out in the tight division race by reacquiring Greg Maddux from the San Diego Padres.

"It's nice to be back," Maddux said. "Last to first. It's pretty cool. One off day and I make up 16 games, so I'm excited."

The 42-year-old right-hander first joined the Dodgers on July 31, 2006, and went 6-3 with a 3.30 ERA in 12 starts to help them win an NL wild-card berth. On Tuesday, the Dodgers fell a game behind the Diamondbacks after an 8-3 loss to the Rockies, while San Diego dropped 17 games off the pace.

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 with 33 home runs 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 of his first homer since July 30.

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 Pena recorded the final two outs for his second save.