Donovan, who was set to start in left field and bat in the leadoff spot Friday against the Phillies, was scratched from the Cardinals' lineup due to neck stiffness, Derrick Goold of the St. Louis Post-Dispatch reports.
Falter came away with a no-decision in Friday's 5-3 extra-innings loss to the Blue Jays, allowing two hits and two walks over six scoreless innings. He struck out five.
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