James Shields

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Kansas City Royals starting pitcher James Shields works against the San Diego Padres during the first inning of a baseball game Wednesday, May 7, 2014, in San Diego. (AP Photo/Lenny Ignelzi)

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Kansas City Royals manager Ned Yost, right, takes the ball from starting pitcher James Shields (33) during the seventh inning of a baseball game against the Detroit Tigers in Kansas City, Mo., Friday, May 2, 2014. Shields was replaced by relief pitcher Kelvin Herrera. (AP Photo/Orlin Wagner)

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Kansas City Royals starting pitcher James Shields delivers to a Detroit Tigers batter during the first inning of a baseball game at Kauffman Stadium in Kansas City, Mo., Friday, May 2, 2014. (AP Photo/Orlin Wagner)

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Detroit Tigers' Alex Avila hits a two-run home run off Kansas City Royals starting pitcher James Shields during the fourth inning of a baseball game in Kansas City, Mo., Friday, May 2, 2014. (AP Photo/Orlin Wagner)

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Kansas City Royals starting pitcher James Shields throws to the Baltimore Orioles in the first inning of a baseball game on Sunday, April 27, 2014, in Baltimore. (AP Photo/Patrick Semansky)

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Kansas City Royals starting pitcher James Shields throws to the Baltimore Orioles in the fourth inning of a baseball game on Sunday, April 27, 2014, in Baltimore. (AP Photo/Patrick Semansky)

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Kansas City Royals starting pitcher James Shields delivers against the Cleveland Indians in the first inning of a baseball game Tuesday, April 22, 2014, in Cleveland. (AP Photo/Mark Duncan)

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Kansas City Royals' James Shields delivers a pitch against the Houston Astros in the first inning of a baseball game on Thursday, April 17, 2014, in Houston. (AP Photo/Pat Sullivan)

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Kansas City Royals pitcher James Shields reacts after walking Minnesota Twins' Aaron Hicks with the bases loaded during the second inning of a baseball game in Minneapolis, Saturday, April 12, 2014. The Twins won 7-1.(AP Photo/Ann Heisenfelt)