Arizona will turn to rookie left-hander Patrick Corbin to try to keep the postseason dreams within reach for another day as its series in Colorado continues on Saturday.
Corbin has faced the Rockies once in his young career, allowing six runs in six innings in a loss on May 16. Since that game, however, both the Rockies and Corbin have undergone significant changes. In his last start, Corbin allowed one run in a career-high eight innings against the NL West-leading Giants.
Manager Kirk Gibson said he was glad to see Corbin get through the eighth inning for the first time.
"As you guys remember, he's had games where he has had low pitch counts, and then as soon as he hit the seventh inning he was done," Gibson said. "It's good to see him get additional innings and make a step forward."
Right-hander Jhoulys Chacin will start for the Rockies. Chacin, who started against the Giants a day after Corbin, has been one of Colorado's best starting pitchers since he returned Aug. 21 from a right pectoral injury that forced him onto the disabled list for more than three months. In six starts since coming off the DL, Chacin has a 2.37 ERA in 30 1/3 innings.
He allowed one run in five innings against the Giants, despite struggling with his control.
"I didn't have my best command today, but whenever I had to make my pitch, I made my pitch," he said.
Rockies: CarGo day-to-day with tight hamstring
Left fielder Carlos Gonzalez was once again sidelined Friday by a tight left hamstring that has bothered him since last Sunday. He played five innings that day, but has played a complete game only once this week.
Gonzalez, who leads the team with an .884 OPS, is considered day-to-day.
"There's a possibility it could be a couple days," manager Jim Tracy said. "I could tell he was favoring it badly when he hit the ground ball yesterday in the first inning. He was actually dragging his leg as he went to first base."
D-backs: Upton stays hot in Colorado
Right fielder Justin Upton went 2-for-4 in the D-backs' 15-5 victory on Friday, extending his hitting streak to eight games. During the streak, Upton is hitting .433 with an .833 slugging percentage.
With a hit Saturday, Upton would match his season high hitting streak. He hit in nine consecutive games from May 17-26. Overall, Upton is hitting .280 with a .430 slugging percentage this season.
"Just trying to get some good pitches to hit, be a little more patient, see the ball over the middle of the plate and put a good swing on it," Upton said this week. "I've tried to stay positive all year and keep going. Stringing together a couple of good days is nice."
After hitting a pair of doubles in Friday night's victory, second baseman Aaron Hill is one double shy of becoming the sixth D-back to hit 40 in a season. He would join Luis Gonzalez, Stephen Drew, Chris Young, Chad Tracy and Paul Goldschmidt.
When Hill hits his next double, he and Goldschmidt will become just the third pair of D-backs to hit 40 doubles in the same season. Drew and Young were the last duo to accomplish the feat, in 2008.
Upton is the only current D-back to have an extra base hit against Chacin. He is 2-for-9 with two doubles. His teammates are hitting just .176 against the right-hander.
Left-hander Jamie Moyer was the beneficiary of the six runs the Rockies scored off Corbin in his start in Colorado in May. Moyer allowed one run in 6 1/3 innings for his last victory in the Major Leagues.