Possible Clues:

• 'It's déjà vu all over again' speaker
• Quotable catcher Yogi
• 'It ain't over till it's over' speaker
• Oft-quoted Yogi
• "I didn't really say everything I said" speaker
• Quotable Yankee great
• Coiner of "It ain't over till it's over"
• Yankee legend Yogi
• Yogi, a legend with the Yankees
• Yankee catching great