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Law: Breaking down the price the Astros paid for Greinke

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Passan: Astros took steps for 2nd World Series in 3 years (1:29)

Keith Law and Jeff Passan detail the Astros' moves in acquiring Zack Greinke, Joe Biagini and Aaron Sanchez. (1:29)

The Houston Astros have made yet another huge trade for a starter, acquiring Zack Greinke from the Arizona Diamondbacks for a package of four prospects, improving their World Series odds while the D-backs clear some payroll and boost an already-strong farm system.