Philadelphia Phillies ace Zack Wheeler is set to have surgery for thoracic outlet syndrome. A surgeon explains the procedure.

You might expect a streak of excellence from Phillies starting pitching if it was led by their dominant ace, Zack Wheeler. You might not expect a streak of excellence from Phillies starting pitching in the absence of their dominant ace,

Wheeler was diagnosed with thoracic outlet syndrome and will require additional surgery that's expected to sideline him for six to eight months.