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He's a 53-year-old member of the club who has teed it up at Augusta against and (unofficially) beaten the likes of Sergio Garcia and Rory McIlroy. Because the club doesn't want a pro playing a round by himself in the Masters, they deploy a "marker" whenever an odd number makes Friday's cut. Since 2003 that "marker" has been Knox, the club champion, members' course record holder (61) and a generally unassuming guy on the course.