The following is a list of all occasions on which a golfer has won eight or more tournaments on the PGA Tour in a year. It is complete through 2015.
Byron Nelson's record 18 victories came in a year when many potential rivals were in military service. Ben Hogan missed half the PGA tour season while both Lloyd Mangrum and Jimmy Demaret missed virtually the entire season. Hogan and Demaret played in only 2 of Nelson's 11 straight tournament wins and Mangrum played in none.
References
Most PGA Tour wins in a year Wikipedia(Text) CC BY-SA