Cubs shortstop Javy Báez was scratched from Sunday's starting lineup against the Cardinals with a right thumb injury.
Báez jammed his thumb in an at-bat last Sunday against the Giants, exiting in the seventh inning. He missed the entirety of the Cubs' three-game series against the Padres this week before returning to the lineup Friday.
Manager David Ross said the injury popped up on Báez again Sunday, attributing it to a diving attempt.
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"It's something we don't want to linger," Ross said. "[The Cubs training staff is] treating him now and I don't want to take any risks."
Báez lunged into the crowd for a pop fly down the left field line in the ninth inning Saturday vs. the Cardinals, appearing to flex his hang after.
Sergio Alcántara, who wasn't in the Cubs' original lineup Sunday, will start at shortstop in Báez' place.