Diamondbacks vs Cardinals matchup hinges on pitcher performance and bullpen reliability in wild-card race

The Diamondbacks travel to St. Louis to face the Cardinals in a makeup game with significant wild-card implications, with Arizona clinging to a razor-thin lead over both St. Louis and Pittsburgh. The contest represents a critical juncture for both teams as they navigate the final stretch of the season. Arizona currently holds sole possession of the third wild-card spot, but the margin between contention and elimination remains razor-thin.

The Pitcher Matchup and Performance Trends

Brandon Pfaadt takes the mound for Arizona against Cardinals starter Michael McGreevy in a matchup where contrasting pitcher trajectories will likely determine the game's outcome. Pfaadt's season has unraveled significantly, with his strikeout rate dropping to the 14th percentile and his ability to generate whiffs deteriorating substantially. His opponents have recorded a 9 percent barrel rate against him—among the lowest in baseball—yet batters continue to make solid contact. Over the past two seasons, his expected ERA and actual ERA have converged around the 3.7 to 4.7 range, suggesting his recent struggles reflect genuine decline rather than bad luck.

McGreevy presents a different profile. His 2.92 ERA reflects better command and contact management, though analysts note the metrics may not be entirely sustainable. The Cardinals starter will face an Arizona offense that has scored 66 runs over its last 10 games, demonstrating potent recent production. However, St. Louis' bats have cooled somewhat in recent weeks, potentially setting up a competitive pitching performance despite McGreevy's moderate xERA.

Bullpen Status and Recent Context

The Diamondbacks' relief corps improved notably following a blowout victory that allowed manager Torey Lovullo to extend workloads and rest key relievers. The game serves as a makeup for a June 25 contest rained out at Busch Stadium, ending a frustration for closer Paul Sewald, who felt earlier game-time scheduling could have prevented the cancellation. A victory would extend Arizona's wild-card cushion to 1.5 games over St. Louis and widen its margin over Pittsburgh to one full game, providing crucial buffer room in the compressed playoff race.