ST. LOUIS (AP) -- Brooks Koepka has dropped a shot heading down the stretch after his wayward drive at the par-4 14th came to rest against the base of a tree, forcing him to take an unplayable lie penalty.
Koepka hit his next shot into the rough left of the green, but he managed to make a nice up-and-down to limit the damage. The bogey left him 11 under, two ahead of Adam Scott and Gary Woodland.
Meanwhile, Tiger Woods wrapped up a 4-under 66 to reach 8 under for the championship. He cooled off on the back nine, making par at every hole after a hot start to the round.
"I hit it good on the back nine today," Woods said, "I just didn't make anything."
Gary Woodland made a mess of the par-4 10th at Bellerive, the second-round leader making triple bogey to drop to 3 over for the day and six shots behind leader Brooks Koepka.
Woodland's trouble began when he found the bunker guarding the right side of the green. He clipped his shot from the sand and it rolled into the bunker on the opposite side of the green.
Meanwhile, Kevin Kisner hit from the same bunker - but nobody raked it.
Woodland blasted his next bunker shot over the green and into the original bunker, where the ball came to rest in a foot print. The big hitter had to conservatively get back onto the green from there, then putted his way to triple bogey.