Bryson DeChambeau, who shared the 18-hole lead with Koepka, went bogey-double bogey around the turn and shot 75.
2 p.m Three-time Masters victor Phil Mickelson began his third round with a par on No. 1.The 48-year-old Mickelson started Saturday three shots behind the leaders on a crowded leaderboard that includes a five-way tie for first place.
A thrilling day was in prospect, with Woods one of four men a solitary shot off the pace at six under.
All logic suggests one of that modern trio should win, given that Woods hasn't won any major for 11 years and this particular one since 2005.
The first tournament Finau ever watched was the 1997 Masters, when Woods wiped out the field by 12 strokes in winning the first of his current 14 majors.
On another mesmerising afternoon at the 83rd edition, the sound that's been missing for years was back as the rejuvenated and rebuilt Woods shot a third round 67 - his lowest round at Augusta for eight long years - to set up what's shaping into the flawless final day.
"It's been a while since I've been in contention here", Woods said. "I hit a bad shot".
Woods joined the chasing pack on a day when going neutral meant losing ground. He was particularly happy to finish, especially after storms moved into the area and stopped play right after his tee shot into 5 feet on the unsafe par-3 12th. Tony Finau (-11), Webb Simpson (-9) and Patrick Cantlay (-6) all made big moves up the leaderboard.
'I think I showed I have a pretty good pain threshold, ' he said previous year, when asked about his overall performance.
Molinari says he was a bundle of nerves as he shared the first tee with the defending champion back then.
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"I can only be happy about today".
No one figures to be as excited as Finau, who turned his ankle celebrating a hole-in-one in the par 3 contest previous year. He still managed to tie for 10th in his first Masters.
Scott was the only player to reach 8-under with a 2-iron into 5 feet for eagle on the 15th, only to miss a 3-foot par putt on the 16th.
All proven in the heat of battle, and in 2013 Masters victor Scott and past runners-up Day and Oosthuizen loaded with serious Augusta credentials.
"You know, it does help because I have won", he said.
Poulter, who trails by four, coped wonderfully with the Woods fanfare, putting on his Ryder Cup blinkers and delivering a fine 68 of his own.
The crowd favors Woods.
Woods said the other day that he proved to himself - with victory No. 80 - that he could win again. Molinari sees it another way.
"The favorite is probably the golf course out there waiting for us, " he said.