On Tuesday, the Rockies edged the first-place D-backs, 8-3, in a game that gave Colorado a glimpse of what is to come.
Prior to Tuesday's game, the Rockies recalled catcher/infielder Jordan Pacheco from Triple-A Colorado Springs and catcher Wilin Rosario from Double-A Tulsa and inserted them into the lineup.
The Rockies will continue to evaluate their young players now that they are essentially out of playoff contention.
"It's not something that you look forward to being involved with year after year, I can tell you that," Rockies manager Jim Tracy said. "But because the situation is what it is, it's obviously an opportunity to take the temperatures of some of these guys and find out where they're at. And also to help to allow them to gain the realization that there is a difference between playing in Triple-A and playing in the Major Leagues."
The youth movement worked on Tuesday. Pacheco went 2-for-4 with two RBIs while Rosario went 0-for-3 with a run scored.
"Is it a conclusive thing with 21 games to play in the season? I don't think so," Tracy said. "But does it give you an idea and can it give you a fairly strong idea? There is that possibility. But a lot of that hinges on the quality of games that you play while they're involved. If you get yourself very involved in a one-sided game, one way or the other, there's a chance that it's not going to provide you with a ton of information.
"But if they're really good ballgames and you still have these people involved, then you can gauge an even better barometer."
The young players will face Arizona starter Joe Saunders on Tuesday. Saunders has a 5.05 ERA in six starts since the end of July, but was under the weather when he took the hill in his last start.
The Rockies will counter with Kevin Millwood, who earned his second win of the season after allowing no runs on seven hits in seven innings against the Padres. The veteran is 6-1 with a 1.93 ERA in nine career starts against the D-backs.
D-backs: Parra on a roll
Gerardo Parra went 1-for-4 on Tuesday and has reached base via hit or walk in eight straight games. He is hitting .429 with three doubles, two homers and four RBIs during that stretch.
The D-backs (73-0) are the only team in the National League to go undefeated when leading after eight innings this season.
Rockies: Tulo cracks 100-RBI mark
Troy Tulowitzki went 1-for-4 on Tuesday, including his 30th home run of the season. On Monday, he became the first Rockies shortstop to have 100 RBIs in a single season. He is also just the third Major League shortstop to have 100 RBIs in a season since 2004, joining Hanley Ramirez and Miguel Tejada.
The Rockies did not have a player reach 100 RBIs in 2008 or 2009, but now have at least one player with 100 RBIs in back-to-back seasons. Carlos Gonzalez had 117 RBIs in 2010.
D-backs catcher Miguel Montero went 1-for-4 on Tuesday to extend his hitting streak to 14 games.
Arizona's Geoff Blum has hit 99 homers in his career, 90 of which have come in the NL.
Dexter Fowler's 15 triples are a franchise record for Colorado.