Top moments from O'Neill's time as a Yankee

Paul O'Neill Yankees No. 21 retired

Best Yankees Playoff Games: Scott Brosius and November magic in 2001 - Pinstripe Alley

Hartnett: 'Warrior' Paul O'Neill Injected Pride Back Into The Yankees - CBS New York

The Yankees Just Tarnished Their Legacy by Retiring Paul O'Neill's Jersey

Opinion: Why Todd Frazier wearing Paul O'Neill's No. 21 isn't a big deal

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Yankees legend Paul O'Neill to receive ultimate honor this August

As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times

Watch: This 4-minute video reveals part of the reason why the Yankees are retiring Paul O'Neill's No. 21

During the Yankees' 4 World Series championships from 1996 to 2000, the player with the greatest WAR on the team was not a member of the Core Four, but actually Bernie Williams.