Rasmus Højgaard admitted there were a "few headscratchers" but he was delighted to be in contention on home soil at the Danish Golf Championship.
The 24-year-old signed for an opening round of 66 to sit two shots adrift of leader Marco Penge, who set the course record with a seven-under-par total, at Furesø Golf Klub.
Højgaard signed for eight birdies but blotted his copybook by going three over through two holes after the turn to join Major Champion Francesco Molinari, Canadian Aaron Cockerill, Scotland's Marc Warren and German Jeremy Paul in the chasing pack at five under.
"A lot of good stuff out there, but a few headscratchers," the Dane said. "I’m very happy to sign for a minus five.
"I played nicely on the front nine, gave myself a lot of chances and holed some good putts.
"Then ten and 11 I spent a lot of energy getting through those two holes. It was very nice to hole a long putt on 12, that’s why I made a little fist pump. It meant a lot for the momentum of the round and I played some nice holes coming in there.
"There was a good showing today. Especially around this course, there’s not a lot of room, so it’s nice to see crowds down both sides of the fairway. It has been a great start to the tournament.
"I’m going to look forward to a nice sleep tonight, but before that I’ll hit a few balls on the range. There were a few loose swings out there that I want to get to the bottom of."
Højgaard was playing in the group behind identical twin Nicolai, who recorded the rare feat of two hole-out eagles in the space of three holes on his back nine, and Rasmus admitted the crowd's reaction meant he knew exactly what happened.
"I know exactly what happened," he added. "When I was making a mess of 11, I looked down 12 and could see they were waving the Danish flags.
"I assumed he holed his second shot, then on 14 we heard a big roar and it was obviously him again. I enjoy listening to the crowds out there. I’m happy he had a few good holes out there."
Nicolai was two over when he drained his approach shot at the 12th hole to climb back to level par.
Two holes later he repeated the trick, with his ball needing one hop before finding the cup, before birdieing the last to reach three under in Copenhagen.
"It was pretty special," he said. "I need a little momentum to start the system.
"On 11, I made a really good four and gave myself a little fist pump. I felt that was important to get into the next stretch and I managed to hit two worldies. It was pretty good to see that.
"The crowds were great. It was cool to see them go nuts and myself. You don’t know how to react when you do stuff like that. It was cool to see them go in. I needed that on the course today. Very pleased with the outcome.
"It’s not an easy golf course. If you’re a little off your game, you have to stay in the fight. I didn’t feel like it was that bad on the first few holes, I just managed to score really bad.
"I managed to get it going on the back nine. There’s chances out there on the front and the back. I’m very happy with how the day ended."
