Kevin Kisner of the United States remains atop the leaderboard at 7-under in the final major tournament of the season, while compatriot Justin Thomas and Louis Oosthuizen of South Africa sit in fourth, two shots behind the leader. He was two shots behind, along with Jason Day.
In the back-nine, he corrected his mistakes and played flawlessly.
Kisner, meanwhile, used his "Texas wedge" from off the green to sink a 47-foot putt at the par-five seventh - his 16th hole - and vault clear of the field, at least for a while.
He recovered with birdies on 14 and 15 to stretch his lead and move to 10 under.
After 17 holes, Finau was 1-under par but made bogey on the final 18th.
"Obviously I'm happy to have made the cut but I'm very disappointed because I got to three under for the tournament and had a few bogeys", said Smith, who won his maiden European Tour title at the Porsche European Open in Germany a fortnight ago.
Day declined to explain it to media after his round but Nick Faldo, the multiple major champion and broadcaster, called it "one of the worst decisions I've seen a professional golfer make".
A sunny Sunday with low humidity
At the beginning, showers and thunderstorms looks to stay fairly scattered and then becoming more wide spread by Tuesday . Skies will be mostly sunny this morning into the afternoon with high temperatures reaching the lower 80s.
Gorakhpur tragedy: Guilty will face action, says UP deputy CM Keshav Maurya
He further said that the IMA has passed three resolutions over the tragic death of children in Gorakhpur's hospital. Prashant Trivedi, the state's top health official, admitted there was a problem in the pipeline supplying oxygen.
Marco Silva believes Watford deserved their late equaliser against Jürgen Klopp's Liverpool
The Hornets lead twice through Stefano Okaka and Abdoulaye Doucoure , either side of a splendid Sadio Mane goal after 29 minutes. The Liverpool legend outlined the reason why Phillipe Coutinho has sensationally handed in a transfer request .
Bernd Wiesberger returned to complete three holes.
With a tree directly in front of him and needing to hit a sizeable hook off pine straw around a swath of trees, the Australian blocked his second shot into a shrub and had to take a penalty drop en route to his crippling quadruple-bogey. His shot from that thick grass stopped 65 feet shy of the stick, and he three-putted.
"This is my first experience leading a major, or tied for the lead after 36 holes".
On Saturday, the elements appeared to have affected a player who had seemed unflappable for much of the last two weeks.
"It was sort of the same as the first couple of rounds", McIlroy said.
Earlier, Jordan Spieth's hopes of a career grand slam evaporated after a level-par 71, wrecked by a closing double bogey to stand three-over overall.
"It was more gettable after the rain delay than it was before, no doubt about it", Spieth said.
"It's just a dream come true to be here, to be up here, talking to you guys at the PGA Championship, one of the greatest tournaments in the world", he said in his press conference after his third round.
"I think that's really beneficial for me here, unlike other majors that we play once every five years or something".