Tom Kim made just one birdie on the front nine but produced an eagle at the par-5 18th four more birdies and a double bogey at the par-5 15th for a 67 to reach 12-under and take a share of the lead at the Genesis Championship.
“It felt great. Just to finish off the way I finished after that bad break on 15 just makes dinner taste so much better,” said Kim.
“Obviously I’ve made a few mistakes this week, but those little things are coming together to back up those mistakes.
“What happened on 15, you can’t control it, you know, one bad swing. You are really unlucky, hit the cart path and it’s out of bounds. I had no idea!
“I told myself going up to that next tee that I’m making sure I’m birdieing a few holes coming in.”
Fellow South Korean and overnight leader Byeong Hun An made three birdies and two bogeys for a 71 to retain his share of the lead.
“I struggled a little bit today,” said An. “The last two rounds have been almost perfect. I didn’t have many birdie chances out there and when I did, I would just miss it by a little bit.
“It was one of those days. It’s golf. It’s been great the last few days, it happens and hopefully better tomorrow.
“I don’t think it can get any better. I said at the start of the week that I would love to play with Tom in the final group on Sunday and hopefully one of us can come out on top.”
France’s Antoine Rozner signed for a 65 featuring three consecutive birdies from the 13th to close with a 65 and a share of third place at 11-under alongside Italy’s Francesco Laporta (70) and Portugal’s Ricardo Gouveia (69)
Gouveia started the week in 154th place on the DP World Tour rankings and now lies in provisional 107th boosting his chances of retaining his Tour card for next season.