On this day in 2012, the 26-year-old Australian professional golfer Rhein Gibson shot a 55 at River Oaks Golf Club in Edmond, Oklahoma—the lowest score ever recorded for a full-length 18-hole course.
He carded 12 birdies and two eagles to be 16 under on the 6,698-yard par 71. Gibson, who was lying 12th on the minor US Golfweek National Pro Tour money list at the time of his record, was playing in a friendly Saturday morning threeball with Ryan Munson and Eric Fox, and began his round at the 10th with a regulation par. After that, he made only three more pars all day, completing his front nine in 26 before adding six birdies on his back nine for a 29.
His final putt was a downhill, right-to-left eight-footer, which fell in dead centre.