Derek Jeter lone Core Four member left as Andy Pettitte joins
Yankees pitcher Pettitte announces retirement – The Denver Post
Yankees' Andy Pettitte Announces Retirement: A 5-Time World
Core four down to one: Pettitte plans retirement after season
Yankees pitcher Andy Pettitte to retire after 16 seasons
Beloved Yankees Pitcher Andy Pettitte Announces Retirement - CBS
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This Day in Yankees History: Andy Pettitte retires, but not for