PHILADELPHIA -- Red Sox right-hander Tyler Thornburg will undergo season-ending surgery on Friday for thoracic outlet syndrome in his throwing shoulder.
The 28-year-old Thornburg, who was acquired in a December trade from the Brewers for Travis Shaw, Mauricio Dubon and Josh Pennington, hasn't pitched all season after his shoulder began ailing him in Spring Training. The Red Sox anticipate Thornburg will be ready for next season.
"It's been a long process for Tyler," said Red Sox president of baseball operations Dave Dombrowski. "In Spring Training, he got shut down, and it's been a long exploration to find exactly what the problem has been.