CHICAGO (AP) -Oft-injured Cubs pitcher Mark Prior will miss the entire 2007 season after surgery on his right shoulder, the biggest setback yet in his once-promising career.
The 26-year-old Prior had surgery Tuesday by noted orthopedist Dr. James Andrews in Birmingham, Ala. Andrews also worked on Prior's rotator cuff.
Prior has been beset by injuries since his first full season in the majors in 2003, when he almost pitched Chicago into its first World Series since 1945.
Prior was not on the Cubs' active roster to start the year and was optioned to Triple-A Iowa after a poor spring training. He instead went to extended spring training in Arizona, but pitched only two innings there April 12 before reporting discomfort in his shoulder.
The right-hander went to Dr. Lewis Yocum in California before going to see Andrews, who told Prior last October he had genetic looseness in his shoulder joints.
Prior is 42-29 with a 3.51 ERA in the majors. He made just nine starts last year for the Cubs after three trips to the disabled list and took a slight pay cut this season, from $3.65 million to $3.575 million.
Prior finished third in NL Cy Young voting in 2003, when he 18-6 with a 4.24 ERA and struck out 245 in 211 1-3 innings. He was the overall No. 2 pick in the 2001 draft by the Cubs.

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