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COL@CHC: De La Rosa throws quality start

In a battle between the two teams in the cellar of the National League West, Jorge De la Rosa will try to keep the Colorado Rockies afloat -- just as he's been doing all season.

De la Rosa has had a relatively good year while the Rockies have struggled to the NL's worst record. The lefty leads the team's qualifying starters in ERA (4.27), wins (11), strikeouts (99) and WHIP (1.27).

But he's struggled on the road -- recording a 5.29 ERA as opposed to a 3.23 ERA at Coors Field -- and has yet to record a win at Chase Field in his career despite posting a 3.89 ERA in seven career starts there.

De La Rosa had one bad inning against Detroit his last time out, and it cost him, as the Rockies were shut out 4-0. The Tigers scored all of their runs in the third inning off the southpaw.

"They are tough on everyone -- for me, that's the best lineup [in the Majors]," De La Rosa said. "I made some really good pitches, and they still hit them. That shows you how good they are."

The D-backs shouldn't present nearly as big of an offensive challenge. Their 5-3 win in Friday's series opener marked the first time they had scored more than four runs in a game in August.

Arizona will send Trevor Cahill to the mound. The right-hander, who was demoted to the bullpen after four poor starts to open the season, has shown mostly improved results since returning to the rotation after the All-Star break.

Cahill's last outing proved to be his best of 2014, as he held Pittsburgh to one run in seven innings with just one walk and seven strikeouts. He's still looking for his first win since April, though.

D-backs: Roster reshuffling results in Paul, Chafin getting called up
Arizona made a few changes to its roster ahead of the series opener on Friday, selecting the contracts of left-handed pitcher Andrew Chafin and outfielder Xavier Paul from Triple-A Reno, while optioning Nick Ahmed and Roger Kieschnick.

Chafin didn't appear in Friday night's game, so he's still waiting to make his Major League debut out of Colorado's bullpen after starting this season in the Minors.

"He'll have to learn how to warm up," said D-backs manager Kirk Gibson. "We'll try to give him extra time to do that. … We'll initially be sympathetic to the fact that he's only been a starter."

Chafin entered the year rated as Colorado's No. 6 prospect, according to, and has a 3.96 ERA with 102 strikeouts in 131 2/3 innings across 23 starts between Double-A Mobile and Reno this year.

Paul, who just signed a Minor League deal with Arizona on Thursday, only played one game with the Aces before getting called up. He had played in 80 games with Baltimore's Triple-A affiliate this year, batting .251 with 12 homers, before being released on Sunday. He previously spent parts of five Major League seasons with the Dodgers, Pirates and Reds.

Rockies: Tulowitzki letting Rockies set rehab schedule
Shortstop Troy Tulowitzki did movement and fielding drills before batting practice, then hit and took grounders during batting practice before Friday night's game against Arizona.

Tulowitzki is getting closer to returning from a left hip flexor strain, which has sidelined him since July 19, and badly wants to help the Rockies avoid their third straight last-place finish in the National League West.

But he's been cautioned by the team's medical staff not to push anything, and is obeying despite his hyper-competitive personality that wants to get back on the field as quickly as possible.

"They know me too well," Tulowitzki said. "They figure I might test it out and end up further injuring myself. I just listen to them."

Rockies manager Walt Weiss said it would be a stretch to say Tulowitzki could be back in a week, but noted he is progressing well.

Tulowitzki's .340 batting average leads all Major Leaguers.

Worth noting
• Arizona outfielder David Peralta, who had a double, triple and steal of home in Friday's win, leads NL rookies with a .314 batting average.

• After going 2-for-4 with a double on Friday, Colorado first baseman Justin Morneau has three straight multi-hit games and has reached base in nine of 10 games since returning from a mild neck strain. Comments