The St. Louis Cardinals are entering a pivotal week, and tonight's lineup against the Miami Marlins showcases some unexpected changes. Nolan Arenado, the eight-time All-Star, will not start at third base after struggling through July, hitting just .163 with a .430 OPS over 14 games. Despite past performances, his current form could put him on the trading block as teams like the Houston Astros and others look for third base help.

Additionally, Iván Herrera is making his professional debut in the outfield after missing significant time due to injuries. Known for his offensive capabilities, Herrera boasts a .313 batting average and could serve as a flexible option as the Cardinals aim to solidify their lineup before the 2026 season.