Baltimore Orioles top pitching prospect Dylan Bundy, who has been sidelined with forearm discomfort since late March, will undergo elbow ligament-replacement surgery – commonly known as Tommy John surgery — Thursday morning in Florida, according to his agent.

Bundy, 20, was the club’s first-round pick in 2011 and made it to the majors in 2012.

He will be out roughly 12 months.

“He’s down, you can imagine,” said his agent Jay Franklin, a former pro pitcher who also had Tommy John surgery. “That’s tough on anyone, especially someone with his level of competitiveness.”

Bundy was shut down at the end of spring training with an injury initially thought to be forearm discomfort. In late April, he had a platelet-rich plasma injection into his right arm and rested for six weeks. He had begun a throwing progression this month but again felt discomfort on Monday after tossing baseballs 120 feet.

He was examined by team orthopedist John Wilckens on Tuesday and then renowned surgeon James Andrews on Wednesday. A partial tear of the elbow ligament had worsened and surgery was recommended, Franklin said.

“Dr. Wilckens and Dr. Andrews are very qualified to make that recommendation and to me it is the right decision,” the agent said.

Andrews, who first administered the injection, will perform the surgery on Thursday.

The timetable for returning from Tommy John surgery is roughly 10 to 14 months – lefty Tsuyoshi Wada had the procedure last May and is currently pitching in the minors. Given Bundy’s tender age and the way he takes care of himself, Franklin is hopeful that Bundy can be back sooner rather than later.

“The good thing is because of how young he is, he should be able to heal quickly,” Franklin said. “Not many people are in better shape.”

Bundy, selected third overall in 2011, stormed through the club’s system. He posted a 2.08 ERA in 23 starts in his first year as a pro in 2012. He was promoted to the Orioles in September and threw 12 / 3 scoreless innings.

— Baltimore Sun