Iconic CBS Sports commentator Jim Nantz has defended his network's coverage of the Masters . The American broadcaster came under fire as Rory McIlroy went back-to-back at Augusta National. History was made on Sunday when McIlroy became only the fourth golfer ever to retain their title at the Masters, doing so just 12 months after completing a career Grand Slam with glory in Georgia. In the United States, CBS brought fans live action from the tournament and its core feed was used in the United