Nelly Korda fired a 10-under 62 to seize control of the Meijer LPGA Classic in Grand Rapids, Mich., on Saturday, riding the low round of the day for a three-shot lead over Ireland's Leona Maguire and finishing 20-under par.
Korda used 11 birdies and a lone bogey on the Par3 11th hole to break outof the pack and move from fourth to first on the Blythefield Country Club Course.
Maguire led after the second round, but only managed a 2-under round of 70 to fall three shots back at 17 under.
"Everything was falling and I was just on a roll," Korda said of her career-best round. "You don't take these days for granted."
Interrupted by a rain delay, the 22-year-old ranked No. 4 in the world, birdied the last three holes and five of the last six.
"(It) definitely got a lot softer," she said of the course after the rain came. "You can be a lot more aggressive on the greens. As I said yesterday, the greens get bouncy, they're a little slower but bouncy. For them to be soft, I can just aim at the hole and shoot at it."
Korda has won four times on tour, the last coming at the Gainbridge LPGA in Florida, in Orlando, Fla., in February, her only win this year.
Korda birdied 1, 2 and 3, then added three more on 6, 8 and 10 before dropping the stroke on No. 11. She birdied 13 and 14 and ended with three straight birdies to push the lead.
She was matter-of-fact about her low score after the round.
"Every time is different I guess in a sense," Korda said. "I've gone to sleep and I haven't been nervous, and there has been times where I couldn't even sleep I woke up so many times during the night. We'll see tomorrow if I'm rested or not."
For Maguire, it was a workman-like effort.
She bogeyed the par-3 seventh hole and then put up birdies on the eighth, 11th and 14th to end with a 70 and come in at 17 under.
"Yeah, I played pretty well from tee to green, felt like," Maguire said. "Gave myself a lot of chances. Just didn't hole any putts today at all. Couldn't really get it going.
"Yeah, I mean, you have to hole putts around here to make some birdies. I didn't really do that. Didn't take advantage of the par-5s enough either. So a little bit of a frustrating day, but still hung in there."
Madelene Sagstrom of Sweden shot a 65 and finished the day in third at 16 under, four shots back.
Australia's Su Oh shot a 3-under 69 to finish alone in fourth at 15-under. England's Georgia Hall (65) and Charley Hull (67) finished the day at 14-under, along with American Mina Harigae (68) and Sweden's Anna Nordqvist (68).
Americans Jennifer Kupcho (67), Sarah Schmelzel (67) and Brittany Altomare (69) are at 13-under, seven shots back.
--Field Level Media