Injuries are a major concern in sports, let alone a starting pitcher with a bad shoulder. Tyson Ross missed essentially all of 2016 with shoulder inflammation, making his only start of the season on opening day.
In October, Ross underwent shoulder surgery for symptoms of thoracic outlet syndrome. TOS is a nerve issue caused by pressure on blood vessels and nerves inside a persons neck.
Surgery such as this one typically takes 4-6 months to recover from. To return to the mound could take even more time, which is why the Padres opted not to tender Ross a contract at Friday’s deadline.