Dunn deal: D-Backs deck Cards in 9th

As quickly as Conor Jackson scored from first base on Adam Dunn's double into the right-field corner in the ninth inning, he was that quick again to join the dog pile on Dunn behind second base.

Dunn stood with his arms raised after his game-winning hit - but not for long. He was mobbed by the Diamondbacks after their 10th come-from-behind victory in five weeks, 4-3 over St. Louis on Wednesday.

It looked like Augie Ojeda just beat Jackson to Dunn, but it did not take long for the entire 34-man roster to join the hopping celebration that carried into short center field.

"Any time you get a walk-off win in September, especially in a pennant race, emotions are going to fly," Jackson said.

"You have to treat every game like a playoff-caliber game, which they are. This type of year, it is difficult to do this."

The victory not only gave the D-Backs (71-68) the 2-1 series victory over St. Louis but also some momentum heading into a three-game series in Los Angeles that begins Friday.

The D-Backs have a 1½-game lead in the NL West after the Dodgers finished a three-game sweep of San Diego on Wednesday, and have won five straight, including two against Arizona.

"We can marinate in this a little," Jackson said.

"It's huge," added Dunn, who joined the D-Backs on Aug. 11. "That's all you can ask for, to be put in that situation. A walk-off win is one of the most exciting things in sports."

Melvin, who said losing the series would have been "demoralizing."

"Now we've got some momentum going into L.A., which we didn't have," he said. "It's one thing to win a game. It's another to walk a team off. An emotional win like that carries over."