Estes will be activated off the 60-day disabled list prior to the game after missing more than two months due to a left ankle injury. The veteran southpaw made a pair of rehab starts at Triple-A Tucson and was 0-0 with a 1.64 ERA.
“I’m ready to go out and compete,” Estes said. “I think I’m ready to go out and give us enough innings to be competitive.”
Estes is 2-1 with a 3.50 ERA in three starts against Colorado this season. Estes, who went 15-8 for the Rockies last season, is 10-5 with a 4.15 ERA in 20 career starts against them.
Arizona missed a chance at a three-game sweep at Pittsburgh with an 8-7, 12-inning loss on Thursday. The Diamondbacks took a 7-5 lead into the bottom of the ninth before closer Tim Worrell surrendered a two-run homer to Jason Bay.
“We’ve got to find a way to win that game,” Diamondbacks manager Bob Melvin said. “We had a lot of opportunities to win that game, more opportunities than they did.”
The Diamondbacks trail San Diego by eight games in the NL West race. They were within 4 1/2 games after beating the Padres on July 29.
Colorado’s Byung-Hyun Kim seeks to win his third straight start. Kim improved to 2-0 with a 0.91 ERA over his last three outings after yielding one run and five hits through six innings in an 11-1 victory over the Los Angeles Dodgers last Saturday.
“Kim was very efficient with his pitches,” Colorado manager Clint Hurdle said. “He’s so confident right now.”
The right-hander is facing his former team for the first time. Kim, who pitched for Arizona from 1999-2003, is best remembered as a Diamondback for allowing game-tying, two-out, two-run home runs to the New York Yankees in Games Four and Five of the 2001 World Series.
Rockies catcher J.D. Closser has gotten more comfortable at the plate as the season has progressed, batting .278 (20-for-72) since the All-Star break. He hit .205 in 48 games before the break.
“I just feel like I’m being more patient and I’m not swinging at as many bad pitches,” Closser said. “At the same time, when I get a pitch to hit, I’ve been fortunate enough to put a good swing on it and not miss it.”
Closser, however, is 2-for-25 (.080) with eight strikeouts in seven games against Arizona.