Nationals pitcher Stephen Strasburg will have Tommy John surgery on Friday to rebuild his injured right elbow. The surgery is expected to sideline Strasburg for 12 to 18 months. The ligament replacement surgery will be in Los Angeles and performed by Dr. Lewis Yocum. "He is dealing with it like a professional," Nationals general manager Mike Rizzo said. "He's very determined to get it done and start the process." Strasburg hurt himself while pitching Aug. 21 in Philadelphia.