Arizona's Dan Haren delivers a pitch in the second inning of Saturday's win over the Dodgers. Haren hurled seven scoreless innings.

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PHOENIX — The Arizona Diamondbacks celebrated '70s Night on Saturday with disco music, afros, bad combovers and polyester pants.

Then they refused to go back in time — edging the Los Angeles Dodgers 3-2 to remain first in the NL West. The D-backs have held sole possession or been tied for the division's top spot since April 6.

And the D-backs did it in dramatic fashion. Closer Brandon Lyon allowed two runs in the ninth before earning his 20th save. Despite a stomachache, right-hander Dan Haren threw seven scoreless innings to relieve an injury-depleted bullpen.

Haren (9-5) struck out seven, allowed two walks and four hits — all singles — and was willing to pitch the eighth inning if needed.

"It seems like every game he goes out there that's the type of performance he gives us," manager Bob Melvin said. "We don't score many runs. Every pitch seems to be paramount. You get a couple runners on, and one pitch can dictate the outcome of the game, so he's just been phenomenal for the better part of two months.

"I don't know that there's been a better pitcher in baseball."

Haren said he lacked energy all day but knew the bullpen needed help, and he credited the defense for strong plays behind him.

Relievers Chad Qualls (back), Doug Slaten (knee) and Juan Cruz (oblique) were unavailable.

Haren faced the most trouble in the third, when he allowed an infield single to pitcher Chad Billingsley and a single through the left side to Matt Kemp. Then Haren got a strikeout and double play to end the threat.

"I just get a feel for the game when I'm out there, whatever's working, go after them that way," Haren said, noting he threw more cut fastballs than usual. "Today was a little different."

Melvin believes Haren — fresh off pitching two innings in Tuesday's All-Star Game — has been better than advertised after being acquired from Oakland.

"He has more of a repertoire than I thought," Melvin said. "You know about the four-seamer and split. It's the cutter which has been a big pitch for him the last few games."

Conor Jackson ignited the D-backs offense with his ninth home run, a one-out, solo shot in the first. Orlando Hudson doubled and scored on Chad Tracy's double for a 2-0 lead.

Pena replaced Haren and threw a scoreless eighth. Jeff Kent ended the shutout with a leadoff home run off Lyon in the ninth.

James Loney reached on a one-out infield single and scored on Delwyn Young's double. Young, representing the tying run, advanced to third on a groundout. After walking Andruw Jones, Lyon got Kemp to fly out to end the game.

The Dodgers had moved into a tie for the division lead with Arizona after beating the D-backs 8-7 in 11 innings Friday.

Friday "was a game we thought we could have had, or definitely could have had," Haren said. "Today there was a sense of urgency."

The D-backs will try for the series win with Brandon Webb (13-4) on the mound today.

"Those guys, it never seems like they have an off-night," Jackson said about Webb and Haren.

Considering Haren's stomach bug, that seemed to be the case.

● For '70s Night, the D-backs put afros, mustaches and huge sunglasses on photos of the players on the scoreboard. When Young came up to bat to lead off the sixth, his mug shot was superimposed on Michael Jackson's body for the "Off the Wall" album cover on the big screen.