World No 1 Inbee Park shot a course record 62 at Mission Hills on Saturday to move into a tie for the lead at the LET World Ladies Championship.
Park's sensational 11-under par round sets up what should be a thrilling head-to-head clash with Suzann Pettersen, the world No 2 carding a 66 to join the Korean on 18-under.
The score, in relation to par, ties the all-time low round for 18 holes on the Ladies European Tour, set by six other players.
Park birdied three of the first six holes but really started to fire in the middle of the round with six successive birdies from the ninth.
She picked up a further shot at the 16th and birdied the closing par-five as well, where Park missed a chance at a 61 by missing a short eagle putt.
Pettersen, who led after the first two rounds, started badly with a bogey at the opening hole but hit back with eight birdies including one at the last to end the day level with Park.
Park said: "It's my career best round today so obviously it was a fantastic round. The last couple of days the putting has been really hard. These greens are a little bit grainy and much slower.
"We played on very fast greens the last two weeks and I just came here and I wasn't used to the greens. I had a lot of putts the last few days but today everything seemed like it was going the right way and I made a lot of putts.
"My ball striking is pretty much really similar for three days but just the putting. Everything I looked at today seemed like it was going in."
Park and Pettersen have a four-stroke lead over Korea's Ye Na Chung with Thailand's Ariya Jutanugarn a further shot back on 13-under.
Trish Johnson is the best of the British challenge on 10-under with Holly Clyburn making a big move through the field with a third-round 64 after a disappointing 74-74 start.