Valverde made his Major League Baseball debut in 2003 to help out when Arizona Diamondbacks closer Matt Mantei was injured. He was named the National League Player of the Week on June 23, 2003. For the season, he finished with 10 saves in 54 appearances. His ERA finished at 2.15 with 71 strikeouts in 50.1 innings pitched.\n', '

Injured for most of the 2004 season, Valverde managed to appear in only 29 games.\n', '

He gained the Diamondbacks closer role after replacing Brian Bruney in 2005. He ended the season with a 2.44 ERA and 15 saves in 61 games.\n', '

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