Frenchman Adrien Mork has carded the first round of 59 in the history of the European, Challenge and Senior Tours.
The 26-year-old posted his 12-under-par score despite recording a double bogey in the second round of the Moroccan Classic Challenge Tour event in Agadir.
Mork, starting at the 10th, went out in 29 with six birdies but then double-bogeyed the second before ending with six more birdies and an eagle.
"It feels like a dream to have done this," Mork said.
"I honestly cannot describe the way I feel because I do not think I fully realise what I have done yet.
"This is the best I have ever played and it is an honour to break so many records for European golf."
The Challenge Tour is a breeding ground for the next generation of European Tour players.
The magical 59 has only been achieved three times in US PGA Tour history.
Al Geiberger (1977 Memphis Classic), Chip Beck (1991 Las Vegas Invitational) and David Duval (1999 Bob Hope Classic) have all done it.