The term 'Yankee Rival' refers to two Major League Baseball teams: the Baltimore Orioles (6 letters) and the New York Mets (3 letters). These two teams are rivals in the American League East division of the MLB, with the Orioles based in Baltimore, Maryland and the Mets based in Queens, New York. The rivalry between the two teams dates back to the 1960s when the Mets were founded as an expansion team.