Marlins manager Dan Jennings said starter Henderson Alvarez underwent shoulder surgery Tuesday in Pensacola, effectively ending the former All-Star's season.
The 25-year old Alvarez, who pitched a no-hitter in 2013, went 0-4 with a 6.45 ERA this season before going on the disabled list with right shoulder inflammation. Alvarez was shut down during a recent rehab start after again feeling discomfort in the shoulder.
"It's a tear in the shoulder," Jennings said. "He's a definite out for the season candidate now."
Jennings said it was undetermined whether Alvarez would be ready to return by Spring Training.
"I think depending on the severity of the tear and we'll know more of a timetable once the surgery is complete."
Alvarez, the Marlins' Opening Day starter, had not pitched since May 22, and was on a rehab assignment at Single-A Jupiter. He made two minor league starts before being shut down again.