The seven-time PGA Tour winner's most impressive shot of the day came on the par-four 12th, where he sank a 19-foot putt to limit the damage to a bogey, his only one of the day.
Matt Kuchar has sunk eight birdies in a second-round 64 to take a two-stroke lead over fellow American Cameron Champ at the Mayakoba Classic in Mexico. Like I said, just had one bad hole, one bad shot really-that tee shot. Coming off his first PGA Tour victory two weeks ago in the Sanderson Farms Championship in Mississippi, Champ conceded the course doesn't fit his long-hitting style ("it's not a bomber's course", he said), but he was pleased to have good control Friday.
"I knew I had a par 5 following it, and I figured I was probably going to make double there and birdie on the next. I was just trying to execute each shot at a time".
Three-time major victor Jordan Spieth, meanwhile, struggled to make an impression, hitting four birdies and four bogeys for an even-par 71.
But Masters runner-up and world number nine Rickie Fowler is still in the hunt after shooting a three-under par 68 on Friday to go into the weekend tied for 20th with 13 other players.
Lopez had her ace on the par-3 17th and the Mexican player will be looking for her first LPGA victory in Saturday's final round at the Jian Lake Blue Bay Golf Club.
Garcia dominant on day 1 at Nedbank: SUN CITY, South Africa - Sergio Garcia flew into a four-shot lead at the Nedbank Golf Challenge after an 8-under 64 secured the biggest first-round advantage on the European Tour for a year.
Jutanugarn led by four strokes after the second round but slipped to a 71, which included a bogey on the final hole.
Thailand's Jutanugarn was in a group with Lopez and her older sister, Moriya, who also struggled, finishing in a tie for seventh after a 2-over 74.