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Cooper Hjerpe
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- 1Cardinals rotation competition: who holds the edge?▼Who leads in the Cardinals’ rotation competition? Sep 22, 2026; Pittsburgh, Pennsylvania, USA; St. Louis Cardinals pitch
The St. Louis Cardinals' pitching rotation battle is drawing attention as young left-handers Quinn Mathews and Cooper Hjerpe appeared with the team before a September 22, 2026 game against the Pittsburgh Pirates at PNC Park. Fans and analysts are weighing which of the club's promising arms will claim a spot in next season's starting rotation.