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Rivera taught Roy Halladay the grip for his cutter
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Mariano Rivera dealt with plenty of adversity on the way to being baseball's greatest closer – New York Daily News
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Yankees weren't happy when Mariano Rivera showed Roy Halladay his cutter
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Why Yankees great Mariano Rivera isn't thrilled about state of baseball
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How Mariano Rivera Once Helped Roy Halladay, Ticked Off Yankees Teammates
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How Mariano Rivera Once Helped Roy Halladay, Ticked Off Yankees Teammates
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Who was the better reliever in their prime, Mariano Rivera or Dennis Eckersley? - Quora
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Mariano Rivera CUTTER Pitching Mechanics Slow Motion Baseball Instruction Analysis Yankees MLB
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Mariano Rivera, legendary Yankees closer, through the years – New York Daily News
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To Red Sox fans, Mariano Rivera wasn't just a great pitcher but also a good sport - The Boston Globe
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Mariano Rivera dealt with plenty of adversity on the way to being baseball's greatest closer – New York Daily News
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Remembering Mariano Rivera's final game - Pinstripe Alley
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Roy Halladay - Wikipedia
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Joe Torre: Mariano Rivera Discovered His Cut Fastball Accidentally, The Rich Eisen Show
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Mariano Rivera - Wikipedia