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BOSTON, MA - MAY 1: Alex Rodriguez #13 of the New York Yankees celebrates with Joe Girardi #28 of the New York Yankees after hit his 660th career home run to tie Willie Mays during a game with Boston Red Sox in the 8th inning at Fenway Park May 1, 2015 in Boston, Massachusetts. (Photo by Jim Rogash/Getty Images)

BOSTON, MA - MAY 1:  Alex Rodriguez #13 of the New York Yankees celebrates with  Joe Girardi #28 of the New York Yankees after hit his 660th career home run to tie Willie Mays during a game with Boston Red Sox in the 8th inning at Fenway Park May 1, 2015 in Boston, Massachusetts.  (Photo by Jim Rogash/Getty Images)