As Daulton Feely noted, the trade that sent Chris Sale from the Boston Red Sox to the Braves for Vaughn Grissom could be one of the worst trades in baseball history as Sale is a Cy Young Candidate this season.
Not only is Sale a Cy Young Candidate, but he is leading the enite majors in strikeouts, ERA and wins above replacement (WAR).
In 81 at-bats this season for the Red Sox this season he is only hitting .148, with 0 home runs and 12 hits. Although he is still considered a "prospect", Sale has complete changed his game around since being traded and could go down as one of the worst deals done by Boston, or the MLB for that matter.