In 1978, Knox turned professional. He was successful at
Fall 1981 PGA Tour Qualifying School and joined the PGA Tour the following year. Knox won three events during his career on the PGA Tour. His first win came at the 1986
Honda Classic. He was the first
Monday qualifier to win on the PGA Tour and is the only player to win with a round of 80. His second win occurred a year later at the
Hardee's Golf Classic and his third came in 1990 at the
Buick Southern Open. During this phase of his career, Knox had more than two dozen top-10 finishes and $1.6 million in earnings. His best result in a
major was a 4th-place finish at the
1991 PGA Championship. In his forties, he had difficulty maintaining his PGA Tour privileges and had to play some on the Nationwide Tour. Knox played on the
Champions Tour in 2007 and 2008, managing only two top-25 finishes. Knox is known for his superior putting ability. He once held the
PGA Tour record for fewest putts in a tournament (93) set at the 1989
MCI Classic. His weakness is in the tee-to-green ball-striking phase of the game. In 1996, Knox used his understanding of the short game to start TourGreens, an Atlanta-based business that designs and installs tour-quality artificial putting greens. He is also active in
golf course design and construction. == Personal life ==