PHOENIX — Luis Gonzalez has had a lot of big hits in his Arizona Diamondbacks career. Few have traveled less distance than his game-tying hit Monday.

Gonzalez had an RBI bunt single, Orlando Hudson drove in the go-ahead run with an eighth-inning sacrifice fly and the Diamondbacks held off the Pittsburgh Pirates 4-3 Monday night.

Trailing by three, the Pirates loaded the bases with none out in the ninth against closer Jose Valverde. After Ronny Paulino popped out, Jose Castillo hit a two-run single to cut the deficit to one. But pinch-hitter Jose Hernandez struck out and Nate McLouth flied out to end it.

"We needed one hit but we put ourselves in that position because we made mistakes and gave them four runs," said Pittsburgh manager Jim Tracy.

Shawn Green walked leading off the Arizona eighth against Damaso Marte (0-3), Damion Easley blooped a single to center and Johnny Estrada advanced the runners with a sacrifice bunt.

Hudson then hit a slicing fly to right field. Jeromy Burnitz chased the ball to the line, but it bounced out of his glove for an error as Green scored. Hudson was credited with a sacrifice fly.

"I firmly believe if the runner had had to tag it would have been a close play given his momentum running toward the infield and it wasn't a long throw to make," Tracy said.

Marte struck out pinch-hitter Tony Clark for the second out. But Easley and Hudson scored when Marte fielded Craig Counsell's high chopper to the right of the mound, spun and threw the ball down the right-field line for a three-base error.

Brandon Medders (1-1) pitched a scoreless eighth for the win, and Valverde got his 13th save in 14 chances.

Jason Bay gave the Pirates a 1-0 lead when he drove Orlando Hernandez's first pitch of the second inning about 12 rows up into the left-field stands for his team-leading 10th home run.

Gonzalez's bunt hit negated a strong outing by Pittsburgh starter Oliver Perez, who threw six scoreless innings. Perez allowed four hits with three walks and four strikeouts.