Robertson is being evaluated for a possible broken hamate bone in his left hand, the Tampa Tribune reports. If his injury is confirmed to be a broken hamate bone, the 21-year-old Robertson will be in danger of missing the rest of 2015. One of the top prospects in Tampa Bay's organization, he owns a .272/.347/.436 slash line through 49 games for Double-A Montgomery this season, after posting a .310/.402/.471 slash line over 132 games for High-A Stockton last year. While it's unclear if he has the defensive chops to stick at shortstop long term, Robertson has a very advanced bat for his age.