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The Arizona Diamondbacks turn to Brandon Pfaadt, who, with his long-term contract, wouldn't seem to be a player they'd trade.

The Astros completed a sweep of the Diamondbacks with a 4-3 win that left them, as of the game's end, with the best record in the American League. Christian Walker, the former Arizona first baseman, delivered the go-ahead hit in the top of the ninth.