The Boston Red Sox , who vowed to be aggressive this winter to make their team a World Series contender, landed one of the premier pitchers on the trade market Tuesday by acquiring St. Louis Cardinals ace Sonny Gray.

Gray, who had a full no-trade clause, agreed to waive it, according to agent Bo McKinnis, for the opportunity to pitch for a contender, while the Cardinals go into a rebuild under new GM Chaim Bloom.

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