Anirban Lahiri in action at the PGA Championship.
However, last week's WGC Invitational victor Hideki Matsuyama was threatening to challenge Kisner's supremacy before a weather delay halted him in his tracks.
Kisner continues to own a piece of the lead following his second consecutive 4-under 67.
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.
Clouds quickly gathered Saturday morning as around two dozen players returned to the course to complete their second rounds. "Hitting fairways are key".
He finished the tournament at 8 over, three shots off the cut line.
"I'm hitting the ball really nice and things are going my way".
"I just had a couple of bad swings, missed a couple of greens in the wrong spots and if you do that you have no hope".
He chipped the next shot within a few feet of the hole and putted in for a five on the hole. "I've hit some good shots and some loose shots". So, the first holes were shaky by any standard and I was three-over.
"Just with the lies that you get in the rough, trickiness around the greens".
The previously slumping Australian had five birdies and an eagle - his second straight on the par-five seventh hole - to get to six under for the tournament. 14 and 17 and his only bogey of the day on the 12th hole.
HOW THE AUSSIES FARED: Day (77) slumped to even-par in a share of 16th; Marc Leishman (71) shares 47th at four-over; Adam Scott (74) dropped to eight-over, tied 68th. At the turn he was four-over for the day and five-over for the tournament.
In the back-nine, he corrected his mistakes and played flawlessly.
"It was more gettable after the rain delay than it was before, no doubt about it", Spieth said. But I was not getting defensive.
And although he birdied the next two and came agonisingly close to making it a hat-trick on the ninth, his final hole of the day, the 28-year-old's second successive 72 left him two-over par.
Defending champion Jimmy Walker of the United States had a miserable day on Thursday, shooting a 10-over 81.