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What's up with Astros' Zack Greinke signaling his own pitches?
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Zack Greinke Is One Of A Kind
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Zack Greinke, Astros shut down A's to win 8-1 opening day
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Surprise! Astros announce Zack Greinke as ALDS Game 4 starter as
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Zack Greinke speeds up tempo with strange tactic
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Zack Greinke Only Builds His Unique Legend With Incredible Pitch
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Astros pitcher Zack Greinke oddly flashed a sign before A's Ramón
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LEADING OFF: Greinke goes for Houston, Yanks crush at Camden
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Zack Greinke, Astros shut down A's to win 8-1 opening day
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Zack Greinke hopes Houston Astros' wins will silence fans' boos - ESPN