Should Red Sox Expect Retribution From Yankees Over Unwritten Rules?

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Red Sox avoid arbitration with Rob Refsnyder, sign former Yankees draft pick to 1-year deal

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The unwritten rules of baseball

Yankees broke MLB unwritten rule during perfect game

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Should baseball's unwritten rules be made history? - The Boston Globe

Jeff Jacobs: Rivalry boiling, Yankees and Rays need to end dangerous game of old school justice