Other articles by Bob Baum:

After Shaq trade, Suns could go big again in draftAfter Shaq trade, Suns could go big again in draftAfter Shaq trade, Suns could go big again in draft Coyotes-to-Canada deal rejected by judge Crucial hearing set in Coyotes bankruptcy case Four step forward in effort to purchase Coyotes 'Fundamental baseball' works as Diamondbacks edge Braves Braves' error, Haren's control prove potent mix for D-backs Padres overcome 6-run deficit in late innings, win 10th in row 3 major sports leagues support NHL in fight to block sale, relocation

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PHOENIX — Yusmeiro Petit did not find out until Monday that he would be Arizona's starting pitcher on Tuesday night.

The short notice did not diminish his effectiveness in five innings against sputtering Chicago, and the Diamondbacks made it two straight over the Cubs with a 9-2 romp.

Conor Jackson drove in three runs with a solo homer and a two-run double. Orlando Hudson added a solo shot for Arizona before leaving the game after being hit by a pitch in the eighth.

Jackson's shot off starter Jason Marquis in the first put Arizona up 1-0, and his sliding score from second on Mark Reynolds' single put the D-backs ahead 2-0 in the third. Stephen Drew doubled in their third run in the fourth.

But after Jackson's bases-loaded double in Arizona's four-run eighth, reliever Kevin Hart hit Hudson in the right ankle, sending the D-backs second baseman to the ground in pain. Hudson had to be helped from the field.

"He's all right," a relieved manager Bob Melvin said. "We took X-rays, no fracture, no crack. It's above the foot, kind of lower ankle on the side. It smarted, so we'll see if he's able to play tomorrow."

Chicago's Daryle Ward hit his 10th career pinch-hit homer, off Tony Peña in the eighth.

The Cubs have lost five of six and scored no more than two runs in each of those losses but still have the best record in the NL at 58-42.

"Sometimes your luck is just not there," Ward said. "Maybe we need some holy water or something. I don't know."

Chicago's three, four and five hitters — Derrek Lee, Aramis Ramirez and Jim Edmonds — were a combined 0 for 10.

"It's only July. I don't see where you should be pressing," Cubs manager Lou Piniella said. "We're just not hitting with men on base, and when the middle part of your lineup's not driving in runs, it becomes a little bit of a scuffle.

"That's exactly what's happened."

The victory brought the D-backs back to .500 (50-50) and put them in first place in the NL West with the Dodgers' 10-1 loss at Colorado.