The Colorado Rockies and Arizona Diamondbacks will meet for the final time in their three-game set on Sunday, May 18, 2025, at Chase Field, as the Rockies look to cap off a rare series win in what has otherwise been a forgettable season, while the Diamondbacks aim to bounce back and even the series before heading into a critical divisional stretch. Arizona enters the contest with a 16–14 record, maintaining competitive form in the NL West despite some inconsistency, and will turn to right-hander Merrill Kelly, who comes into the game at 4–2 with a 3.71 ERA, offering the club its best chance to steady the rotation and contain a Rockies lineup that has quietly shown signs of life. Kelly has continued to demonstrate his trademark efficiency and command, capable of working deep into games with a steady mix of fastballs, cutters, and off-speed pitches, and will aim to take advantage of a Rockies offense that ranks near the bottom in most categories but still carries individual threats. Colorado, sitting at a league-worst 5–25, has been playing from behind all season but has benefited from recent contributions by young hitters like Hunter Goodman (.299 AVG, 29 RBIs) and Jordan Beck, who has added power with 8 home runs despite limited support around him.

The Rockies will start Chase Dollander, whose 2–4 record and 6.88 ERA illustrate the struggles of a young pitcher still trying to find consistency at the big-league level, and his ability to limit walks and pitch to contact will be crucial in avoiding big innings against an Arizona team that averages nearly 6 runs per game at home. Defensively, Colorado has been plagued by lapses all season, contributing to their sky-high team ERA and inability to maintain leads, while Arizona has been more disciplined but still seeks more consistency in the field and from their bullpen. The Diamondbacks’ offense is led by veteran slugger Eugenio Suárez, who has already hit 14 home runs and driven in 37 runs, anchoring a lineup that can explode when their top bats find rhythm early in games. If Arizona can jump on Dollander early and give Kelly a lead to work with, they’ll be in a strong position to take control of the game and the series. For Colorado, the path to victory will require a clean defensive game, a quality start from Dollander, and timely hitting from the top of the order—something they’ve rarely achieved all at once in 2025. A win for the Rockies would mark only their second series win of the season and provide a much-needed spark for a club desperately seeking positives. For the Diamondbacks, avoiding a series loss at home and building on their offensive strengths remains key as they navigate a crowded NL West. With both teams motivated by contrasting goals—Colorado looking for respectability and Arizona hunting playoff relevance—Sunday’s finale has all the makings of a pressure-packed showdown between two teams trending in opposite directions.