Paul O'Neill Yankees No. 21 retired
Sagging Yankees right ship for an afternoon, beat Blue Jays on Andrew Benintendi home run - The Boston Globe
NY Yankees royalty honored as Paul O'Neill's No. 21 is retired
Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed
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New York Yankees retire Paul O'Neill's No. 21; GM Brian Cashman, owner Hal Steinbrenner booed by fans - ESPN
Yankees retire Paul O'Neill's No. 21 jersey - NBC Sports
Will Paul O'Neill return to YES Network booth for Yankees games this season? An update
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times
New York Yankees history: Paul O'Neill's number 21 must be retired
Paul O'Neill stunned Yankees are retiring his number
Paul O'Neill's number to be retired by Yankees
NY Yankees retire Paul O'Neill's No. 21
Should the Yankees retire #21 for Paul O'Neill?