The Mets and the MLBPA settled a contract case with Yoenis Cespedes that reduced Cespedes’s salary:

Mets general manager Brodie Van Wagenen, Cespedes’ former agent, said in late May the outfielder suffered multiple right ankle fractures in an accident at Cespedes’ ranch in Port St. Lucie, Florida, where the club’s spring training complex is located.

New York withheld part of Cespedes’ salary, alleging he was hurt during an activity prohibited by his contract’s guarantee language. The players’ association filed a grievance, and the sides settled on an amended contract before the case was argued.

“The club has reached an agreement with Yoenis Cespedes to amend and restructure his contract,” the team said in a statement Friday. “Cespedes remains under contract with the Mets through the 2020 season.”

ESPN.com

The MLBPA takes the guarantee very seriously. The MLBPA scuttled the trade that was going to send Alex Rodriguez to the Red Sox over a reduction in the guaranteed part of the contract, even though Rodriguez agreed to the deal. For the MLBPA to settle on this indicates there was very good evidence that Cepedes did something wrong.