Possible Clues:

• 'It ain't over till it's over' speaker
• 'It's déjà vu all over again' speaker
• "I didn't really say everything I said" speaker
• Oft-quoted Yogi
• Quotable catcher Yogi
• Hall of Famer who was a Yankee manager and a Mets coach
• Yogi, a legend with the Yankees
• Player in a record 75 World Series games
• Coiner of "It ain't over till it's over"
• Yankee great Yogi