At the 1923 Florida West Coast Open (sometimes referred to as the West Coast of Florida Open), Hagen carded the first 18-hole score of 62 in any tournament recognized as a part of the PGA Tour. It happened on March 17, 1923, in the third round. Hagen went out in 33 and came home in 29 at Belleair Heights Golf Course in Belleair Heights, Florida.
https://www.golfcompendium.com/2021/12/pga-tour-18-hole-record-progression.html