Yankees to retire Paul O'Neill's No. 21 jersey in August at Yankee Stadium's Monument Park | CBS Sports Headlines Yankees to retire Paul O'Neill's No. 21 jersey in August at Yankee Stadium's Monument Park O’Neill will become the 23rd player in Yankees history to have his number retired ESN FeedsThis … Continue reading Yankees to retire Paul O'Neill's No. 21 jersey in August at Yankee Stadium's Monument Park