Seattle Mariners send top prospect Tyler O’Neill to St. Louis Cardinals for Marco Gonzales

SEATTLE — The Mariners have acquired young left-hander Marco Gonzales from the St. Louis Cardinals in exchange for top outfield prospect Tyler O’Neill.

The clubs pulled off the deal Friday, the second move to add pitching help in as many days for the Mariners. Seattle acquired veteran reliever David Phelps from the Miami Marlins on Thursday.

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