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Isan Diaz, Marlins

While he’s hit well at AAA (29 homers and an .885 OPS in 590 plate appearances), Diaz struggled mightily once the Marlins brought him up. In 201 plate appearances with Miami last year, he hit an unhealthy .173 with a .566 OPS. Despite just 47 starts at second base in the majors, he made a high number of errors (nine).