Melancon done for year

CHICAGO — Mark Melancon’s first season as a Giant, disappointing on many levels, officially is over.

The reliever will undergo season-ending surgery Tuesday to relieve compression in his forearm. He twice spent time on the disabled list with a pronator strain in his right elbow area.

“We said let’s go ahead and get this thing done for his peace of mind and everybody’s,” manager Bruce Bochy said.

Melancon has had a muscle and nerves constricted by tissue, leading to inflammation and soreness in a rare condition called pronator syndrome. The surgery is to cut the fascia that encloses the muscle and nerves, releasing pressure.

Dr. Steven Shin will perform the surgery in Los Angeles, and Melancon could throw in six to eight weeks, said Bochy, adding more will be known after the operation. Bochy said Melancon will be fully recovered well before spring training.

Melancon wrote on Twitter, “This season definitely hasn’t gone the way I was hoping it would, and I know for you, the fans, it’s been a frustrating year as well . ... I tried to battle through this injury and gave everything I could, but it’s time to fix this and get back to the player you know.”

Melancon signed a four-year, $62 million contract in the offseason, but blew five of 16 save opportunities, starting on Opening Day. Briefly: Ty Blach is going to the bullpen. With ample September off days, the Giants didn’t want a six-man rotation. ... Jarrett Parker, out since straining his oblique Sept. 1, took batting practice and is expected to be available Sunday.