PHOENIX (AP) - Jim Tracy and the Colorado Rockies are still searching for their usual late-season surge.

``I've talked a lot over the last few days about us trying to generate some momentum,' Tracy said after the Rockies' 12-3 loss to the Arizona Diamondbacks on Saturday. ``Momentum comes from consistency day in and day out from the mound. We are having our bouts falling short in the area.'

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The latest to struggle was Jason Hammel (5-10), who was down 4-0 before he recorded his first out.

``It's almost comical to me because tonight was the best I felt all year,' Hammel said. ``You make a good pitch, it gets hit. You make a bad pitch it gets hit. From the get-go I was thinking no-hitter stuff tonight. It is pretty frustrating getting tagged for eight after that.'

Troy Tulowitzki hit his team-leading 19th home run and Wigginton added a two-run single for the Rockies, who have lost two of three.

Willie Bloomquist singled to right leading off the game and Gerardo Parra walked. Upton doubled just under the glove of a diving Ty Wigginton at third, scoring both runners for a 2-0 lead.

Upton moved to third when Chris Young singled to center and both came home on Montero's double to left to make it 4-0. Pitcher Josh Collmenter drove home Montero three batters later for a 5-0 lead.

Tulowitzki lined a home run just over the right-field fence to start the second and cut Arizona's lead to 5-1. But Montero hit a two-run homer into the Rockies' right-field bullpen in the bottom of the inning, his 12th, to put the Diamondbacks in front 7-1.

``It is somewhat of an insurmountable task when you spot the opposition seven runs in the first two innings of the game,' Tracy said. ``Actually, it's somewhat unacceptable.'

``In order to create momentum and get the ball rolling and keep the ball rolling in the direction we want to go, you can't do it with two well-pitched games, then you back up two days, then you get another one, then you back up for three days,' Tracy said. ``It is not going to get you where you have to get to.'

Colorado pulled to within 7-3 in the fourth on Wigginton's two-out flared single into shallow center. Hammel settled in somewhat after the tough start, lasting 5 2-3 innings and allowing eight runs on 12 hits with four walks and seven strikeouts. He left after loading the bases only to see left-hander Eric Stults walk Montero to make it 8-3.

Upton added a grand slam off Stults in the eighth and finished with six RBIs. Montero drove in five as the duo became the first teammates in Diamondbacks history to drive in five or more runs in the same game.

Arizona starter Josh Collmenter (6-5) allowed three runs on six hits with no walks and four strikeouts to record his second consecutive win and also added two hits and his first career RBI. He struck out four and didn't walk a batter for the second straight start.

NOTES: Collmenter had only two three-ball counts and has not walked a batter in his past 19 1/3 innings across three starts. Upton also drove in six runs on May 20, 2009 at Florida. ... Montero has three career five-RBI games. He leads NL catchers with 23 doubles and 36 extra-base hits. ... Collmenter's toughest moment came running the bases, when he was thrown out at home by Ryan Spilborghs trying to score standing up on a single by Parra. Collmenter wasn't helped by Upton, who signaled for his pitcher to come in standing and not sliding. ... Hammel has given up 14 runs, 12 earned, on 20 hits over 10 2-3 innings in his past two starts. The right-hander had not allowed an earned run in two previous starts against Arizona this season. ... Todd Helton hit his 547th career double in the fourth, tying Manny Ramirez for 24th place on the all-time list.