Rhein Gibson set a provisional world-record score last Saturday by shooting a 16-under 55 at the River Oaks Golf Club in Edmond, Okla., according to a report in Golfweek.
Gibson knocked in 12 birdies and two eagles on the 6,698-yard par-71 course on May 12, the report said.
"I am trying to think myself what happened ... I just kind of got hot I guess and every putt I hit went in," Gibson told the Eagle Eye Blog at Oklahoma Christian University, where he was an NAIA All-American.
Gibson, a 26-year-old Australian pro, is 12th on the Golfweek National Pro Tour money list, according to CBS Sports.
"I'm a pretty humble guy," Gibson said, according to USA Today. "If people want to talk about (the 55), I'm happy to talk about it. But it's not like I'm going to bring it up or get a tattoo on my arm."
Gibson's score matches a 55 by Homero Blancas on a par-70 Texas course in 1962.
Gibson was playing among a threesome with Ryan Munson and Eric Fox.
Munson told USA Today he took safeguards to ward off possible jinxes as Gibson's round began to take shape.
"I was starting to get superstitious," Munson said. "How do I keep from doing something different?"
Munson said he documented the round by texting his wife, friends and old friends of Gibson's.
"He hit it on the right spots on every hole to put (the ball) in good position," Fox said. "It was almost a perfect round of golf."