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On December 14, in a blockbuster trade, the Diamondbacks acquired starting RHP Dan Haren from the Oakland Athletics for six players: LHP Brett Anderson, LHP Dana Eveland and LHP Greg Smith ; the above-mentioned just-acquired infielder Chris Carter ; and outfielders Aaron Cunningham and Carlos Gonzalez.

The team also traded relief pitcher Jose Valverde, who led the major leagues in saves in 2007 with 47, to the Houston Astros for reliever Chad Qualls, RHP Juan Gutiérrez and IF / OF Chris Burke.

Haren was 15 – 9 with a 3. 07 ERA for Oakland in 2007.

On August 5, 2008 Dan Haren signed a four-year, $ 44. 75 million deal with the Diamondbacks worth a guaranteed $ 41. 25 million through 2012 and including a $ 15. 5 million club option for 2013 with a $ 3. 5 million buyout.