Valdez signed with the Arizona Diamondbacks on May 2, 2005, as an international free agent.\n', '

He played at various levels of their minor league organization until 2010, when he was called up to the Majors on May 3 and made his Major League Baseball debut later that day. Valdez was designated for assignment on September 13. He made nine appearances for the Diamondbacks in 2010, and posted a 1–2 win–loss record, 7.65 earned run average (ERA), and 13 strikeouts in 20 innings pitched.\n', '

On December 9, 2010, Valdez was acquired by the Pittsburgh Pirates as the player to be named later in the trade for Zach Duke.\n', '

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