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Michael McCann at Sports Illustrated claims that Josh Hamilton could be gone "in [a] matter of days", and even his salary. The basis for this is language in the Uniform Player Contract:
Some of the relevant language can be found in the UPC’s Loyalty Clause:
Loyalty
3.(a) The Player agrees to perform his services hereunder diligently and faithfully, to keep himself in first-class physical condition and to obey the Club’s training rules, and pledges himself to the American public and to the Club to conform to high standards of personal conduct, fair play and good sportsmanship.