There were almost two balls in the hole in quick succession when Patrick Cantlay's tee shot found the 12th green.
Gary Woodland remains the man to catch at Bellerive Country Club, where Brooks Koepka and Charl Schwartzel shot record-equalling 63s.
Kevin Kisner finished in a share of second place at The Open last month and moved into the lead in the final major of the year on Friday.
Francesco Molinari moved to the top of the European Ryder Cup points list with his historic victory at Carnoustie.
Seeking a 15th major title and first in 10 years, Tiger Woods surged into contention at the 147th Open Championship on Sunday.
Kevin Kisner's hopes of a maiden major win suffered an early blow, as Jordan Spieth and Tiger Woods got underway at The Open.
Only a few "horror stories" will be exchanged with Jordan Spieth before the last round of The Open, says Kevin Kisner.
On a day of low scoring at Carnoustie, Tiger Woods went back to the clubhouse at five under par after his third round at The Open.
Despite bogeying the 16th hole for a second successive day, Jordan Spieth was pleased with his second round at Carnoustie.
It promises to be a grandstand weekend at Carnoustie, as Tommy Fleetwood, Rory McIlroy and Jordan Spieth made gains at The Open on Friday.