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MLB's spring training a test run for new rule changes
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MLB gives pitchers OK to call own PitchCom signals in spring training - ESPN
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Who's involved in calling pitches? Everyone, Tigers skipper says
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Sign of times: MLB gives OK to electronic pitch calling
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Wondering how PitchCom works? Check out HR's and Dan's demo in 42
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The pitch clock is already starting to destroy baseball - AS USA
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Echoes of the Past: Lopez trade a warped reflection of Yuni trade - Royals Review
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Cub Tracks pushes the buttons - Bleed Cubbie Blue
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The Complete Game: Reflections on Baseball and the Art of Pitching: 9780307390585: Darling, Ron: Books
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Astros insider: Zack Greinke shows why he's one of a kind
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Push-button pitching: MLB to let pitchers call own signals
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Houston Astros 2017 cheating scandal: What you need to know
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Tigers' Matthew Boyd is back -- and he's even calling some of his own pitches