Graeme McDowell shot a 2-under 70 on the Plantation Course.
He's back on the course at 3:50 Irish time on Friday. He opened with scores of 65-63 and made his only bogey of the tournament on the second hole in round one.
South Africa's Jacques Blaauw signed for a sublime eight-under 63 to lead by one stroke in the clubhouse on 13-under. I don't think the wind's supposed to blow quite as hard tomorrow, so I've probably got to make a few birdies.
"Based on the amount of talent that lives here, based on the resumes that live here and having that course knowledge, it is a little bit surprising; I find it a little bit odd (that a local hasn't won the RSM)", said Johnson, a two-time major champion who has played on all 11 years of this tournament.
The 20-year-old, who turned professional last year and has yet to finish in the top three in a European Tour event, is on 16 under-par after a round that included six birdies and two bogeys, the latter both coming in his first five holes.
Four-time PGA Tour victor Villegas hit a daring approach shot on his final hole and then coolly converted an eagle putt to follow up his opening round 64 with a solid 66.
Tenth-ranked Tyrell Hatton of England holed his second shot from 110 yards for an eagle on the 16th hole in a 69 and is tied for 31st, while sixth-ranked Webb Simpson, who has lost twice in playoffs at the RSM including a year ago, is tied for 41st after a 66.
McDonald shot 68. She had the hole-in-one on the par-3 12th and birdied the par-5 14th to get close to Kim. The American dropped a stroke on the par-4 16th.
He said he enjoyed the weather that was "a little bit more Colombian" on Friday. "So, I thought a 115 shot, just playing the front edge, would be enough to pitch it a few yards on and let it release. That's kind of my strategy, because I wasn't looking at the hole, but then it went in".
"I just trying to keep push myself until the last hole", Kim said.
McDonald struggled on the greens late.
"I pushed my drive, it bounced on the cart path", he said.
Lydia Ko (66) was 7 under, and Brooke Henderson (66), Minjee Lee (67), and Austin Ernst (65) were 6 under. No. 1 in the world for the last 68 weeks, she has been home in South Korea since the COVID-19 pandemic.
"We ve only played 36 holes", Villegas said.