Chad Campbell, who had a share of the first-round lead, had an even-par 72 to remain at 7 under. With conditions again ideal on a hazy, humid day with temperatures in the 80s and a slight breeze, Flesch started at No. 10 and quickly built on his opening 66, making four birdies and an eagle for a record 30 on the back side of the forgiving 7,482-yard Atunyote Gold Club course, with its wide fairways and soft, smooth-rolling greens.

Flesch hit a 3-wood to within 14 feet at the 562-yard, par-5 12th hole and made eagle to reach 9 under, birdied the next two holes and sank a 15-foot birdie putt at No. 18 to tie de Jonge for the lead at 12 under.

Flesch, who started the tournament with six birdies on his first eight holes on the front side, took sole possession of the lead with a 17-foot birdie putt at the par-4 second hole. But a three-putt bogey from 35 feet on his final hole nullified a birdie at No. 8.