Mateo was optioned to High-A Tampa and reassigned to minor league camp Friday, Erik Boland of Newsday reports.
The 21-year-old will repeat his highest level in the minors, where he struggled with a .254 batting average and .685 OPS last year despite eight home runs and 36 stolen bases. His attitude has been an issue, and Mateo may need to show more maturity before being trusted at the higher levels. Adding that to his toolsy makeup eventually could produce a fantasy stud. Still, with Gleyber Torres, Clint Frazier and other top prospects bolstering the top of this system, Mateo may wind up elsewhere in the coming years if he can't correct his flaws.