During the second round of the Danny Thomas Memphis Classic in 1977, Geiberger became the first player in history to post a score of 59 (−13) in a PGA Tour-sanctioned event.

[2][3] Starting on the tenth tee of the Colonial Country Club in Cordova, Tennessee, he shot a bogey-free round of six pars, 11 birdies, and an eagle on the 7,193-yard (6,577 m) layout.

He shot even-par 72 in the first and third rounds,[5] and was two strokes down to Gary Player on Sunday after a 38 (+2) on the front nine put him at 241 (−11) for 63 holes.

His son Brent Geiberger is also a professional golfer who won two PGA Tour events.

Another son, John, was the coach of the Pepperdine University golf team from 1996 to 2012, and won the NCAA Championship in 1997.