Arizona @ Colorado preview

Last Meeting ( May 21, 2013 ) Arizona 4, Colorado 5

The Colorado Rockies are starting to prove they belong with the big boys in the National League West. The Rockies will try for their fifth win in six games when they host the Arizona Diamondbacks on Wednesday in the rubber match of their three-game series. Colorado is 4-2 on its seven-game homestand against San Francisco and Arizona following a 5-4 victory in 10 innings over the Diamondbacks on Tuesday in which the Rockies regrouped after blowing a 4-0 lead.

Arizona is tied with San Francisco for first place - one game ahead of Colorado - despite losing two of its last three games. The Diamondbacks will give the ball to red-hot Trevor Cahill, who is 3-1 with a 1.36 ERA in his last five outings. He will face Jorge De La Rosa, who has won his last three starts but wasn't sharp in his last outing. The duo faced each other in back-to-back starts last month, with each earning a victory. Troy Tulowitzki homered Tuesday and is hitting .394 at home.

TV: 3:10 p.m. ET, Fox Sports Arizona

PITCHING MATCHUP: Diamondbacks RH Trevor Cahill (3-4, 2.48 ERA) vs. Rockies LH Jorge De La Rosa (5-3, 3.58)

Cahill yielded one run in eight innings in his last start, a 9-2 victory at Miami on Friday. The 25-year-old has struggled with his command, though, walking four in each of his last two outings and 16 in his last five turns. Cahill lost at Coors Field 4-3 on April 20 and won in Arizona 3-2 on April 25. He is 2-4 with a 4.87 ERA in seven starts against the Rockies. Troy Tulowitzki and Carlos Gonzalez are a combined 4-for-21 against Cahill, but Dexter Fowler is 5-for-10 with two triples.

De La Rosa allowed five runs and nine hits in five innings, but was the winner as Colorado held off San Francisco 10-9 on Friday. In his previous two starts, the 32-year-old allowed five hits in 13 shutout innings in victories at St. Louis and against the Mets. De La Rosa has won all three of his home starts with a 2.65 ERA and 1.06 WHIP. De Le Rosa is 7-4 with a 2.28 ERA, 1.20 WHIP and .212 batting average against in 18 appearances - 14 starts - versus Arizona.

WALK-OFFS

1. Colorado closer Rafael Betancourt left Tuesday's game with a groin injury after throwing two pitches in the 10th inning. He is day-to-day.

2. Arizona has played the most one-run games in the major leagues and is 11-8 in such contests - tied for the most wins with Cleveland (11-3) and Cincinnati (11-6).

3. Rockies LHP Rex Brothers hasn't allowed a run in 17 consecutive innings covering 18 appearances. He has yielded one run in 20 1/3 innings over 22 games this season.

PREDICTION: Diamondbacks 3, Rockies 2