Already a winner this season, Higgo chipped in for eagle on the par-5 first, parred the second and followed with five straight birdies in a 7-under 29 on the front nine.
The 26-year-old South African added four birdies on the back, the last on the par-5 18th to get to 22-under 194.
“Hit it great, made a lot of good putts and chipped in once,” Higgo said. “Just everything was really solid and took advantage of the opportunities that I had.”
Young had 11 birdies and two bogeys in a 63. The 30-year-old is winless on the PGA Tour.
“Just keep doing what I’m doing and just focus on playing my game and not looking at the leaderboard too much or worrying about others,” Young said.
“I’m excited about it because last year I finished second here and missed out by one in a playoff. Kind of feels like revenge here to be in the final group again. I’m excited to see if I can break through.”
Ryder Cup rookie Ben Griffin (66), Trevor Cone (65) and Chad Ramey (67) were two strokes back.
Only three tournaments, including this one on the southern tip of Baja California in Mexico, remain this season.
The top 100 in the FedEx Cup – down from 125 in previous years – retain full PGA Tour cards for next season. Higgo is 57th and Young is 136th.
Higgo won the Corales Puntacana Championship in April in the Dominican Republic for his second PGA Tour title. That event was played opposite the RBC Heritage.
“Not really anything new,” Higgo said. “Just doing a lot of the same stuff.”
American Luke List made a dreadful mess of the par-4 15th hole with a 12 in a round of 85.
It was the second-highest hole score on the PGA Tour this year, behind William Mouw’s 13 on the par-5 16th in the second round of The American Express at the PGA West Stadium Course.
List was last among the 75 weekend qualifiers at six over.
