Which player was nicknamed "Double X"?

Which player was nicknamed "A-Rod"? What position did Rafael Palmeiro primarily play? What position did Jimmie Foxx primarily play? Jimmie Foxx is best known for playing with which MLB team? What position did Mel Ott primarily play? Mel Ott is best known for playing with which MLB team? What uniform number did Mel Ott wear with the Giants? What position did Eddie Mathews primarily play?