Core Four to take part in first pitches
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The next New York Yankees 'Core Four' will emerge in 2017
New York Yankees Core Four Replica Ring Set - CharityStars
Mets Deteriorate While Four Core Yankees Sustain Themselves - The New York Times
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Yankees' Core Four answer the postseason bell
Core Four - Wikipedia
The Fifth Member of the Core Four - River Avenue Blues
New York Yankees: Who Will Form the Next Core Four?, News, Scores, Highlights, Stats, and Rumors