Darin Erstad started the game with a single, and the Anaheim Angels never stopped hitting.
"The ball's jumping off Darin Erstad's bat every time he's up there," said Hollins, whose seventh and eighth homers led Anaheim's five home-run evening.
Erstad was a nearly impossible out against the Diamondbacks. In three games, he went 10-for-14 with a double, a triple, two homers and four RBIs.
Erstad singled, tripled and homered against Arizona starter Bob Wolcott (0-1) and added a single in the sixth.
"This is just something to work at," Erstad said. "You try and make the good times go as long as you can. It's just a matter of being comfortable at the plate."
Hollins and Matt Walbeck homered to key a five-run first inning for the Angels, who have won 10 of their last 11. Garrett Anderson homered later in the game for Anaheim.
"The ball travels very well here and fortunately it traveled well for us," said Anaheim interim manager Joe Maddon.
Jay Bell and Karim Garcia hit home runs for the Diamondbacks, who have lost six of their last eight games.
"We couldn't keep the ball in the ballpark tonight," said Arizona manager Buck Showalter.
Jason Dickson (6-4) won his fifth straight decision.
Troy Percival relieved and struck out Yamil Benitez with the bases loaded to end the eighth, preserving a 9-5 lead. Percival finished for his 19th save.
Erstad led off the game with a single against Bob Wolcott (0-1) and Hollins followed with his seventh homer into the right-field bleachers. Jim Edmonds singled, Cecil Fielder walked and Walbeck homered with one out.
Erstad chased Wolcott in the fourth inning with a two-out, line-drive homer to right field.
Wolcott, making his second start since he was recalled from Triple-A Tucson on June 1, allowed seven runs on seven hits and three walks in 3 2-3 innings.
"It seemed like they were hitting everything," Wolcott said. "I was trying to be perfect and I kept getting behind guys."
Anderson added a two-run homer in the fifth inning against Felix Rodriguez. Hollins hit his second home run in the ninth.
Garcia hit a solo shot in the fifth and Bell added a three-run homer in the sixth. Devon White added an RBI double in the seventh for Arizona.
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