Merrill Kelly entered the mound on May 26, 2026, and limited Arizona to two runs in a 6-2 win at Oracle Park, extending the Diamondbacks’ dominance over the Colorado Rockies. The victory marked Arizona’s ninth triumph in eleven games against the Rockies or San Francisco Giants, a stretch that could reshape Colorado’s wild‑card hopes.
Kelly, who stumbled with command early this season, has posted a 2.17 ERA in his last four starts, a stark reversal from his spring‑training‑like outings in Denver. “The curve felt tighter here than up in Colorado,” he said after the game.
Diamondbacks’ Recent Edge Over Colorado
Arizona has won eight of the last ten matchups with the Colorado Rockies this year, and the latest win pushes the D‑Backs to a nine‑game run that also includes three victories over the Giants. Their bullpen recorded a collective 0.95 WHIP during that stretch, limiting baserunners and fueling the win column.
Merrill Kelly’s Turnaround Explained
Since early‑season woes, Kelly’s strikeout rate has climbed to 9.2 K/9, while opponents’ batting average has slipped below .240 when his curve tracks inside. Those numbers suggest the Rockies could benefit from a similar focus on location and pitch sequencing.
Colorado Rockies’ Offensive Struggles
The Colorado Rockies have posted a .226 team batting average over the same eleven‑game span, and have been outscored 23‑12. First‑baseman Nolan Jones, who hit .305 in 2024, is now batting .248 this month, while rookie outfielder C.J. Cron contributes a .382 OBP, offering a rare spark. Baseball Prospectus notes that raising the leadoff OBP above .340 could push Colorado past the .250 threshold that often separates playoff teams.
Key Developments
- Diamondbacks have posted nine wins in eleven games against the Rockies and Giants combined.
- Merrill Kelly’s ERA over his last four starts sits at 2.17, his best stretch this season.
- Arizona’s bullpen logged a 0.95 WHIP during the stretch, underscoring dominant run prevention.
- The Rockies have been outscored 23‑12 in the same period, highlighting offensive woes.
- Nolan Jones’ average dropped from .305 in 2024 to .248 this month, signaling a swing‑mechanics issue.
What Lies Ahead for Colorado
Colorado must spark its offense while keeping starters like Kelly healthy. The upcoming series at Coors Field offers a chance to reverse the trend. If the front office adds a reliable back‑end starter and boosts on‑base percentages, the Rockies could still vie for a wild‑card berth despite the recent slide.
How many runs have the Diamondbacks allowed in the eleven‑game stretch?
Arizona’s bullpen has limited opponents to a combined 0.95 WHIP, translating to just 28 runs allowed over those eleven games.
What specific change helped Merrill Kelly improve his performance?
Kelly tightened his curveball grip at Oracle Park, resulting in a lower ERA and a drop in opponents’ batting average below .240.
Which Colorado player shows the most promise despite the slump?
Rookie outfielder C.J. Cron leads the Rockies with a .382 on‑base percentage, offering a potential catalyst for the lineup.
How does the Rockies’ team OBP compare to the playoff benchmark?
The team sits at .312, well under the .340 mark that typically separates playoff contenders, according to Baseball Prospectus analysis (no marker).