Jon Lester

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Chicago Cubs' Jon Lester throws during a spring training baseball workout Tuesday, Feb. 14, 2017, in Mesa, Ariz. (AP Photo/Morry Gash)

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Boston Red Sox's Jon Lester delivers a pitch against the Tampa Bay Rays in the first inning of a baseball game on Sunday, June 1, 2014, in Boston. (AP Photo/Steven Senne)

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Boston Red Sox's Jon Lester winds up for a pitch against the Tampa Bay Rays in the first inning of a baseball game on Sunday, June 1, 2014, in Boston. (AP Photo/Steven Senne)

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Boston Red Sox starting pitcher Jon Lester works in the first inning of a baseball game against Atlanta Braves on Tuesday, May 27, 2014, in Atlanta. (AP Photo/John Bazemore)

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Boston Red Sox manager John Farrell heads back to the dugout after removing starter Jon Lester during the seventh inning against the Toronto Blue Jays in a baseball game at Fenway Park, Thursday, May 22, 2014, in Boston. Lester gave up seven runs on 10 hits in the Red Sox's 7-2 loss, the team's seventh straight loss at home. (AP Photo/Charles Krupa)

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Boston Red Sox starting pitcher Jon Lester (31) watches Toronto Blue Jays' Melky Cabrera, right, round the bases on a solo home run during the first inning of a baseball game at Fenway Park, Thursday, May 22, 2014, in Boston. (AP Photo/Charles Krupa)

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Toronto Blue Jays' Jose Bautista (19) is congratulated by Jose Reyes, left, after his home run off Boston Red Sox starting pitcher Jon Lester during the first inning of a baseball game at Fenway Park, Thursday, May 22, 2014, in Boston. (AP Photo/Charles Krupa)

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Boston Red Sox starting pitcher Jon Lester heads for the dugout after pitching his side during the second inning of a baseball game at Fenway Park, Thursday, May 22, 2014, in Boston. Lester allowed seven runs, all earned, in the first and second innings. (AP Photo/Charles Krupa)