Colorado (64-72) at Arizona (77-59)

While the Arizona Diamondbacks look to further distance themselves from their closest pursuer in the NL West, they have a chance to make some team history in the process.

Looking to extend their season-high overall winning streak to nine games, the Diamondbacks can complete a series sweep of the Colorado Rockies with a club-record 12th consecutive home win Wednesday night.

After totaling seven runs during a six-game skid, Arizona (77-59) has outscored its opponents 42-10 while winning eight in a row to open a six-game division lead over reeling San Francisco, which has dropped three straight and 21 of 31.

“Everything is going well right now,” All-Star catcher Miguel Montero(notes) said. “Everything is coming together at the right time.”

Coming off a 14-hit effort in Tuesday’s 9-4 win over Colorado (64-72), Arizona can make franchise history with another home victory. The Diamondbacks have averaged 6.2 runs while winning 11 in a row at home for the third time in their history.

They can also win nine straight overall for the first time since a 12-game run June 18-30, 2003.

Gerardo Parra(notes) had four hits with two RBIs on Tuesday, while Montero hit a three-run shot and Justin Upton(notes) matched a career high with his 26th homer as Arizona beat Colorado for the 13th time in the last 17 meetings.

“They are just hot and going out there with a lot of confidence,” losing pitcher Aaron Cook(notes) said of the Diamondbacks. “When you are playing a team with that much confidence, it doesn’t give you much room for error.”

Upton has four home runs and 18 RBIs while batting .412 (21 for 51) against the Rockies this season.

Josh Collmenter(notes) (8-8, 3.19 ERA) looks for a fifth consecutive strong outing when he tries to help the Diamondbacks complete the sweep. Since giving up six runs in 2 1-3 innings of a 7-4 loss to the Dodgers on Aug. 5, the rookie right-hander has yielded five over 26 innings while going 2-1 in his last four starts. Collmenter allowed six hits in 5 1-3 innings of a 5-0 victory over San Diego on Friday.

“He’s got a good plan and sticks to it, throwing his fastball to both sides of the plate,” Padres infielder Logan Forsythe(notes) said. “And he tries to get you to chase his elevated fastball.”

The right-hander is 1-1 with a 3.97 ERA in two starts versus Colorado, and also threw two innings of one-hit, scoreless relief against the Rockies in early May.

Carlos Gonzalez(notes), who is 2 for 3 with a homer off Collmenter, was one of four Rockies with three hits Tuesday, but Colorado fell to 1-4 since a five-game winning streak.

Though Gonzalez has not homered in his last four games or driven home a run in three, he’s batting .412 (28 for 68) with eight home runs and 26 RBIs in his last 17 contest. He’s 16 for 44 (.364) versus Arizona in 2011.

Scheduled Colorado starter Esmil Rogers(notes) (6-3, 5.93) has allowed four runs in each of his last three starts, going 0-2 during that span. He struck out seven over 6 2-3 innings of a 6-1 loss at Dodger Stadium on Friday.

The right-hander was solid in his only career start against the Diamondbacks on Aug. 20, 2010, when he allowed one run and struck out six in 6 1-3 innings of a 4-3, 10-inning loss at Chase Field.