There are only 2 instances since 1900 of a player winning a men’s professional major by 10 strokes or more.
Tiger Woods has both of them, and they were both by 12 or more (1997 Masters, 2000 U.S. Open).
During the entire 2000 PGA Tour season, Tiger Woods recorded one round higher than 73. It came in the first round of the Masters.
He shot 75 on a day when the field averaged 75.59.
In the last 60 years, there are 3 instances of a player winning 5 (or more) PGA Tour starts in a row.
They belong to: Tiger Woods (7), Tiger Woods (6) and Tiger Woods (5).