Colorado Rockies vs Arizona Diamondbacks Picks and Prediction for Wednesday August 12 2026

The Colorado Rockies will face the Arizona Diamondbacks on Wednesday afternoon at Chase Field in Phoenix, Arizona. First pitch is scheduled for 3:40 PM ET, with MLB.TV providing coverage. Colorado enters the matchup at 46-73 overall and has struggled badly on the road at 19-41, while Arizona is 64-56 overall with a strong 36-25 record at home. At the time of this writing the odds were not released. Bettors looking for more baseball analysis can also check out free MLB picks.

Starting Pitchers

Colorado is expected to start Ryan Feltner, who enters at 4-6 with a 5.71 ERA and 1.45 WHIP across 82 innings. Feltner has allowed 86 hits and 18 home runs while recording 59 strikeouts against 33 walks. Arizona lists Merrill Kelly as its probable starter, although he is also listed as day-to-day. Kelly is 8-9 with a 4.88 ERA and 1.47 WHIP over 120 innings, allowing 126 hits and 23 home runs while striking out 80 and walking 50.

Rockies Struggling Away From Home

Colorado enters Wednesday with a 46-73 overall record and has dropped four of its last five games. The Rockies were shut out 9-0 by Arizona on Monday after losing two of three in St. Louis. Their only victory during the five-game stretch was an 8-6 win over the Cardinals. Colorado's 19-41 road record remains one of the biggest concerns in this matchup.

The Rockies have actually produced respectable offensive numbers, batting .256 with 568 runs, 1,034 hits and 134 home runs. Colorado owns a .324 on-base percentage and .421 slugging percentage. Hunter Goodman leads the club with 34 home runs and 69 RBI, while Jake McCarthy is batting a team-best .306 with a .516 slugging percentage.

Pitching has prevented Colorado from turning that offensive production into more victories. The Rockies have a 5.51 team ERA and 1.52 WHIP while opponents are batting .288. Feltner's 5.71 ERA fits those season-long struggles, and his 18 home runs allowed in 82 innings creates another potential problem against Arizona.

Diamondbacks Have the Home-Field Edge

Arizona comes into the matchup at 64-56 overall and has been excellent at Chase Field with a 36-25 home record. The Diamondbacks have won three of their last five games, including Monday's 9-0 victory over Colorado and two wins against the Dodgers. Their two defeats during that span came by four runs combined.

The Diamondbacks are batting .242 with 546 runs, 975 hits and 115 home runs while posting a .315 on-base percentage and .395 slugging percentage. Ketel Marte leads Arizona with 20 home runs and 65 RBI, while Gabriel Moreno leads the club with a .304 batting average and .385 OBP.

Arizona's strongest statistical advantage comes from its pitching staff. The Diamondbacks carry a 4.11 ERA and 1.29 WHIP compared with Colorado's 5.51 ERA and 1.52 WHIP. Kelly has not been dominant, but Arizona has a much stronger overall pitching profile and has already demonstrated its ability to shut down this Colorado lineup in the series.

Colorado Rockies vs Arizona Diamondbacks Picks and Prediction

Pick: Arizona Diamondbacks Moneyline

Arizona is the stronger side based on home performance and the large difference between these pitching staffs. The Diamondbacks are 36-25 at Chase Field, while Colorado is only 19-41 on the road. Neither probable starter has dominant season numbers, but Arizona's bullpen and overall staff have been considerably better. After the Diamondbacks handled Colorado 9-0 earlier in the series, take Arizona on the moneyline.

Pick: Over 9.0

This pitching matchup creates enough scoring potential to favor the over. Feltner owns a 5.71 ERA and has surrendered 18 home runs in just 82 innings, while Kelly carries a 4.88 ERA with 23 home runs allowed. Colorado also has better offensive numbers than its overall record suggests, including a .421 slugging percentage. With neither starter offering much margin for error, take the over if the total is set at 9.0.

This game was completed prior to play on Tuesday.