Hayes will miss the remainder of the regular season with a broken rib, Pirates Prospects reports.
He missed more than a month with a back issue and had begun a rehab stint before shutting things down with the broken rib. Hayes slashed .263/.319/.393 with six homers and six stolen bases for Low-A West Virginia. The 19-year-old, who will probably advance to High-A Bradenton at some point in 2017, has little competition at the upper organizational levels but is still likely several seasons away from debuting for the Bucs.