Robert Rock narrowly missed a 30-foot putt for eagle that would have given him the second round of 59 in European Tour history.
The Englishman settled for a birdie, a 10-under 60 and first place on 13 under overall after the third round of the Irish Open.
Rock made 11 birdies, including six straight to close his round. His putt for eagle at the last was from just off the green, and it slid left of the cup .
"The finish was a bit much really," Rock said. "I holed a really long putt on No. 17 and it was only when I was walking to the second shot on No. 18 and checked the par (of the course) that I realized it was an eagle for 59.
"It's disappointing not to make it, but 60 is a great score and I've played rubbish so far this season so it's nice to play better."
Rafa Cabrera-Bello (63) will join Rock in the last group, one shot off the lead along with Eddie Pepperell (66).
Second-round leader Zander Lombard is a stroke further back after a 68.