98.7 FM Phoenix’s John Gambadoro reports Ryne Nelson has a partially torn forearm flexor.

Oof. Nelson was pitching really well since a down April, compiling a 3.75 ERA and a 2-3 record over 57 2/3 innings since the start of May. Gambadoro also reports Yilber Díaz is being called up to replace Nelson. This is typically the kind of injury that would cost a pitcher multiple months, so Nelson is droppable in fantasy leagues once this report is confirmed.