Tiger Woods still has eleven holes left to play and sits at three-under par.
But he is no stranger to mammoth rounds at the year's final major, having endured a 36-hole last day during his title defence at the 2016 edition - when he finished runner-up to Jimmy Walker by one shot.
Woodland, who teed off the back side at 8:01 a.m., wasn't about to get caught up in whether his lead would withstand the day with so many players still on the course and others still waiting to start their rounds. So guys, I think we'll see some putts go in.
He reached the par-5 eighth hole in two shots and two-putted for a birdie to climb to four under and six shots off the pace.
The action starts at 1pm and you can keep up to date with all the scores right here with our leaderboard. "He drove the ball unbelievable and he gets the putter rolling quite often".
"I just was trying to make the thing and I really thought I made it", said Koepka. "I've been so in the zone you don't know where you are or where you're at". Kisner is not. He relies more on a clean hit with his irons and a great short game.
It has been an eventful second round so far for Tony Finau, who opened the tournament with a 4-over-par 74.
"It's close, and it got closer", said Spieth when asked how he felt about rediscovering his best form. "This course would be phenomenal - and probably is phenomenal - if it's not playing soft". Personally, I would prefer more hard and firmer, faster conditions on the greens.
"It's the same way I do on the court when I'm not making shots, " Curry said. Woods had to scramble for a 6, and was 3 over before he grabbed his backup shirt, which seemed to make a difference. Along with his three birdies, he saved par from a bunker on the par-3 sixth hole from about 18 feet.
Midway through the afternoon round, the cut was projected to be even par. He went on to play his next 5 holes in 2 under par, which leaves him at even par for the championship in a tie for 64th. In conditions like Bellerive, no lead was safe.
"As always, it's an wonderful opportunity to be out here to test my game under the ultimate pressure, stressful situations, " Curry said. "I'm not too anxious with what anyone else is doing out there".