St. Louis Cardinals at Washington Nationals: Final Score & Recap

The St. Louis Cardinals handed the Washington Nationals a 9-3 defeat at Nationals Park on June 20, 2023, building a lead that proved insurmountable well before the final out. The DiamondIQ model opened with the Nationals holding a 49 percent home win probability, but by game's end that figure had fallen to zero, a reflection of how thoroughly St. Louis controlled the contest across nine innings. The Cardinals scattered their nine runs across six different frames and finished with 14 hits and no errors, while Washington committed one error in a night where their pitching staff absorbed steady damage.

The game's most decisive stretch unfolded in the second and fifth innings, with Cardinals starter Jordan Montgomery simultaneously limiting Washington's offense. Dylan Carlson delivered the game's single most impactful offensive play in the top of the second, connecting for a home run off MacKenzie Gore that swung the win probability by plus 8.5 percent in St. Louis's favor. Carlson finished as the game's top offensive performer by a clear margin, posting a WPA of plus 15.8 percent and an RE24 of plus 2.3. Washington briefly answered in the bottom of the fourth when Stone Garrett laced a double off Montgomery for a plus 10.9 percent swing, and Luis Garcia Jr. followed with a triple for an additional plus 9.9 percent, making that the Nationals' most threatening sequence of the evening. St. Louis responded emphatically in the fifth, however, as Willson Contreras doubled off Gore for a plus 8.1 percent swing and Nolan Arenado added a sacrifice fly worth plus 8.0 percent, effectively extinguishing any momentum Washington had generated.

Jordan Montgomery was the game's dominant individual performer regardless of discipline. The Cardinals left-hander accumulated a WPA of plus 21.2 percent, anchoring the St. Louis effort on the mound and limiting a Nationals lineup that managed eight hits but could not string enough damage together to threaten the outcome. Willson Contreras rounded out the Cardinals' standout contributors with a WPA of plus 11.7 percent and an RE24 of plus 1.9, reinforcing that St. Louis received significant production from multiple lineup spots. The DiamondIQ model's estimate of Washington's chances declined steadily throughout, accurately tracking a game that was rarely in genuine doubt after the Cardinals' early scoring bursts.