Hernandez, who is ranked as the No. 13 international prospect by Baseball America, is an infielder, who scouts say is likely to become a third baseman. The 6-foot, 160-pound lefty trained at the Carlos Guillen Academy.
The Mets are 57-64 this season, 9.5 games behind the first-place Washington Nationals in the N.L. East. The Mets pitching staff took a pair of hits this month with injuries to starter Jacob deGrom and closer Jenrry Mejia.
- Paul Palladino