While Olesen and Kisner shared the lead with 67 each, there were five players at three-under 68 in Tied-3rd.
Numerous players talked about how tough it was out there on Thursday.
In the first round, Spieth nearly lost a chance to connect when he birdied two consecutive holes before putting two birdies to get back into the chase for another Grand Slam.
Spieth said: "Given it's the first round I know I'm still in it but I've got to make up ground".
"I would love to be on it, but the way I'm playing ..." I'd like to see the course keep playing the way it is.
Thomas started the day with a birdie after sinking an 8-foot putt on the par-5 10th hole.
The 29-year-old Australian blocked out a stressful weather-delayed second round, which briefly halted his surge up the leaderboard, to be two shots off the pace heading into Saturday's third round at Quail Hollow. He's in contention without having played his best golf yet.
"You have to drive it in the fairway " that's definitely key", Fowler said. "I've gotten paired with Jon a few times, and Rory and I have played quite a bit of golf together over the years". "That's already set. It's more so in between the ears, making sure I make the right decisions and not get ahead of myself".
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"I love the greens", Kisner said.
"The two things that were missing pretty much the whole year was my driving and my putting", Day said.
He was tied third alongside US Open champion Brooks Koepka, Gary Woodland, DA Points and Chris Stroud, whose win last week at Barracuda forced him to change plans as he qualified for the PGA Championships. My internal dialogue on all water holes goes like this: Don't hit it into the water, don't hit it into the water ... it's in the water.
Olesen has won four times on the European Tour, including once in each of the past three seasons, but he's still searching for his first win of 2017.
On the 592-yard, par-five 10th, his first hole of the day, McIlroy's second shot went right toward the gallery, ricocheted off the macadam cart path and rolled into rough on the 11th hole, 110 yards from the pin on No. 10. "I'm just hitting it in the wrong spots". "I had a good week in France, but besides that, I haven't really had the results".
Olesen has played in four PGA Championships in the past five years and has made three cuts with a top finish of 27th.
Phil Mickelson and Ernie Els had a miserable start to their 100th Major as they shot 79 and 80 respectively. You have to be good off the tee and I've done that.