Lynn made his major league debut earlier in the year with the Cardinals, posting a 1-1 record and a 5.23 ERA in two starts.
He will be available from the bullpen in Wednesday’s contest against the Philadelphia Phillies.
Batista, a 17-year veteran, was signed as a free agent in January and had a 3-2 record with a 4.60 ERA in 26 appearances — one start — for St. Louis.
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