ST. SIMONS ISLAND, Ga. -- Sebastian Munoz saw the tough weather conditions on the way to the RSM Classic and figured all he could do was keep his head down and make birdies. He wound up with a 10-under 60 to shatter his career round by 6 shots.
Scoring was so low Thursday at Sea Island that all that got Munoz was a 1-shot lead. The Colombian, who won his first PGA Tour event just over a year ago, birdied his final hole at Seaside.
He led by 1 stroke over Sea Island member Zach Johnson at Seaside, while three players were 1 shot behind to par. Past champion Mackenzie Hughes, Chez Reavie and Scott Stallings each had a 9-under 63 on the Plantation course.
Four players were tied at 8 under, led by Canadian Corey Conners (62 at Seaside). His wife, Malory, gave birth last week to their first child, a girl named Reis. Jhonattan Vegas, Talor Gooch and Russell Henley shot 64 at Plantation.
Scoring was so ideal that 33 players shot 66 or lower on the two courses, located just off the Atlantic Ocean, and all but 21 players in the field of 156 broke par. The cumulative score in relation to par at the Seaside Course was 288 under, 42 shots lower than the previous record set in 2018.
The scoring average of 66.308 at Seaside was a tournament record, and the second lowest for any round on the PGA Tour since 1983, when the Tour began tracking hole-by-hole data. The record is 66.28 at Indian Wells in the 2003 Bob Hope Chrysler Classic.
A warm, sunny day that began with just enough light rain to soften the already pure greens is expected to morph into more common November weather on the Georgia coast Friday with a drop of about 10 degrees in the temperature and wind forecast to gust as high as 30 mph.
"When you've got just absolute pure conditions weather-wise and pure conditions on the golf course -- the best I've ever seen these two golf courses, period -- you know you've got to get after it," said the 45-year-old Johnson, who hit all 18 greens.
"It was a perfect day and we all knew it (low scores) was out there," added Cameron Smith, who had a 66 at the Seaside.
Munoz, however, was staying in the present for his best round as a professional. He hit 11 fairways and 16 greens, made six birdies on the front nine and punctuated the day with a 12-foot eagle putt at No. 15 and a 10-foot birdie putt at No. 18.
"I felt great yesterday playing the pro-am, basically the same weather for two days, so I knew I was hitting it good," he said. "I just let it happen."
And for tomorrow?
"I haven't really looked at the forecast," he said. "I don't know how much it's going to blow tomorrow or if it's going to be cold or not, so I'm just kind of here right now and I'll adjust tomorrow and see what happens."
Johnson was the only player who had a reasonable shot at a sub-60 round. He was 9 under through 15 holes after making a 7-footer for birdie at No. 15 and missed birdie attempts of 10, 20 and 25 feet on the final three holes.
"It hit me (the chance to shoot 59) after I birdied 12 and 13 and I got to 8 under," Johnson said. "Making birdie on 15, I was like, 'Well, two more and I'm right there.' I gave myself looks, pretty good looks, and that's all you can hope for."
Johnson also had a shot at 59 in the Tour Championship in 2007 until hitting into a bunker on the par-3 18th hole at East Lake and having to settle for par and a 60.