Edwin Jackson

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Chicago Cubs starter Edwin Jackson throws against the Arizona Diamondbacks during the first inning of a baseball game in Chicago, Thursday, April 24, 2014. (AP Photo/Nam Y. Huh)

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2Chicago Cubs starter Edwin Jackson throws against the Cincinnati Reds during the first inning of a baseball game in Chicago, Saturday, April 19, 2014. (AP Photo/Nam Y. Huh)

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Chicago Cubs' starting pitcher Edwin Jackson throws against the St. Louis Cardinals in the first inning of a baseball game, Sunday, April 13, 2014, in St. Louis. (AP Photo/Bill Boyce)

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Chicago Cubs starting pitcher Edwin Jackson winds up during the first inning of a baseball game against the Pittsburgh Pirates on Wednesday, April 2, 2014, in Pittsburgh. (AP Photo/Keith Srakocic)

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Chicago Cubs' Edwin Jackson throws a pitch against the Arizona Diamondbacks during the first inning of an exhibition baseball game, Friday, March 28, 2014, in Phoenix. (AP Photo/Ross D. Franklin)

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Chicago Cubs pitcher Edwin Jackson throws against the Cincinnati Reds during the first inning of a spring training baseball game, Saturday, March 22, 2014, in Mesa, Ariz. (AP Photo/Matt York)

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Chicago Cubs pitcher Edwin Jackson throws against the Cincinnati Reds during the third inning of a spring training baseball game, Saturday, March 22, 2014, in Mesa, Ariz. (AP Photo/Matt York)

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This is a 2014 photo of Edwin Jackson of the Chicago Cubs baseball team. This image reflects the Cubs active roster as of Monday, Feb. 24, 2014, when this image was taken. (AP Photo/Ross D. Franklin)