Washington Nationals general manager Mike Rizzo (left) looks on as newly-acquired pitcher Rafael Soriano models his jersey Jan. 17, 2013, during an introductory news conference at Nationals Park in Washington. Rizzo also discussed the three-team trade that sent Michael Morse to the Seattle Mariners in exchange for pitching prospect A.J. Cole from the Oakland Athletics. (Associated Press)

Washington Nationals general manager Mike Rizzo (left) looks on as newly-acquired pitcher Rafael Soriano models his jersey Jan. 17, 2013, during an introductory news conference at Nationals Park in Washington. Rizzo also discussed the three-team trade that sent Michael Morse to the Seattle Mariners in exchange for pitching prospect A.J. Cole from the Oakland Athletics. (Associated Press)