A junior at Indiana University, Overton birdied eight holes -- including his final three -- and bogied just once to tie the mark for lowest stroke play score in the Amateur Public Links' 77-year history.
His 64 equaled Albert Ochoa (first round, 1997) and Robert Gamez (second round, 1989) for the APL stroke-play record.
Also just 20-years-old, Chris Wheeler of Texas fired a 5-under-par 66 -- notching six birdies and just one bogey to move into second place. Trailing him was 21-year-old Matt Johnson of Fairfax, Virginia, and Jason Baitaille of South Plainfield, New Jersey, who each carded 3-under par 68s.
Just 10 of the more than 150 competitors broke par on the first day of competition.