Scotland's Ross Drummond stormed into a two-shot lead in the Senior PGA Championship after a four-under-par 66 at Canterbury Golf Club in Ohio.
He is clear of a group of five players that includes two-time major champion Bernhard Langer, who added a 70 to his opening 68.
Drummond admits he is surprised to be leading such an illustrious field as he bids to become the first European since Jock Hutchison in 1947 to win the Senior PGA.
He said: "I felt my game was good enough to make the cut, but I didn't expect to be in or near the lead. I would say, yes, I'm very surprised."
In 20 years as a journeyman pro on the European Tour, Drummond never won a tournament.
Asked whether he can close out the deal over the weekend, Drummond added: "To be honest, I don't think I even want to contemplate that.
"It would be a dream come true, obviously. It would be an unbelievable achievement, and something to be very proud of. But I don't think I can even contemplate that."
"There's still a long way to go," he added. "It's only halftime."
The big collapse of the day belonged to Greg Norman. He was two-under and a strong contender after 15 holes but he put his third shot at the par five 16th out of bounds and ended up with a triple-bogey eight on his way to a two-over 72.
"C'est la vie," the two-time Open champion said with a shrug. "What are you going to do?"