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The Arizona Diamondbacks defeated the St. Louis Cardinals 5–3 on July 18 at Chase Field in a low-scoring contest that fell short of the Vegas total line of 9.5. Arizona's pitching staff struck out seven while allowing eight hits and three earned runs with a 4.18 ERA, though the Diamondbacks managed only eight hits and a .693 OPS at the plate. St. Louis countered with eight strikeouts and kept Arizona's run production limited, but the Cardinals' pitching proved costly—surrendering five earned runs on eight hits with a 4.13 ERA and five walks that proved damaging in the close matchup. Both offenses struggled to generate power, with Arizona recording no home runs and St. Louis managing just one, resulting in a combined 4 RBIs for the Diamondbacks and 3 for the visitors. The Cardinals' inability to capitalize on scoring opportunities, coupled with Arizona's defensive efficiency (zero errors), ultimately decided the outcome in the home team's favor. Arizona's pitching discipline will be tested as the rotation continues through the season's second half.