"I managed to hit in the fairway today for the most part and gave myself a lot of chances. Coming in with short irons into these greens was definitely the key to the round", said Olesen. "Felt like I made a lot of good pars out there".
The 28-year-old Californian won the Wells Fargo Championship in 2012 at Quail Hollow for the first of his four career PGA Tour victories.
Day, who won the PGA Championship in 2015 and finished runner-up previous year, struggled early with three dropped shots through 13 holes before rallying with two birdies and an eagle.
Spanish playing partner and Master champion Sergio Garcia has an even worse time, shooting a four over par 75.
Lahiri, who finished fifth at the 2015 PGA Championship, had a specific goal in mind. He had not missed a cut all year until The Open. Including his win at Erin Hills last month, Koepka has five top-6 finishes, including two in the PGA Championship. He's No. 78 in the world rankings.
Kisner's card was highlighted by a chip-in eagle on the par-five seventh hole and he was pleased with the position he put himself in at the midway point.
"For a stretch of that round, I drove it really well". Olesen did the same with six birdies and two bogeys. "But it's a different course than we've played in the past", he said.
"I've always fought a push to the right and got sick and exhausted of it", he said. "It's the same game I've been playing 23, 24 years". He prepared to get out, move on, and minimise damage because you're going to have opportunities.
"I've got to make up ground". So that was kind of the goal was to grab the lead.
Aug 10, 2017; Charlotte, NC, USA; Brooks Koepka tees off on the 13th hole during the first round of the 2017 PGA Championship at Quail Hollow Club.
"This course is very tough".
"I like looking at leaderboards seeing what the cut line is and where I am, so I was looking all the way around and it was nice to see my name up there with the big guys". "But take him out of the equation - I feel like I'm still right there in the tournament".
"I guess a low round used to be a 61 or a 62", McIlroy said. With birdies on two of his last three holes, he kept himself within sight of the leaders on a very hard course that most likely will become even tougher to handle as the week progresses.