Tom Lewis says he "tried too hard" after suffering a late collapse when he appeared on course to post a historic round at the Made in Denmark on Thursday.
The Englishman was 12 under through 13 on the par-71 course, but saw his form desert him on the remaining five holes, bogeying three of them.
Despite missing out on a first official sub-60 round in European Tour history, Lewis finished with a score of 62, equalling the course record and earning him a share of the lead with Joakim Lagergren and Thomas Pieters.
But Lewis was unable to celebrate what, on another day, would have been round to be proud of.
"I'm massively disappointed right now," he said. "It's a difficult one teeing it up late and having a lot of people out there to see something good, and not to come back with something special is a shame.
"Apologies. I tried and next time we can hopefully finish it off.
"There were no nerves but I tried too hard. Everyone does that when they think and I just started thinking, which maybe is the reason I backed up. Next time I will learn. It shows to me I can shoot 59.
"It was a good round but a disappointing one, but how many people can get disappointed with nine under? It's a tough one but everyone could tell it was on there and unfortunately I came up just short.
"But it's not a problem, if I go out there tomorrow and do the same thing I did today I could shoot another nine under."