US rookie Knapp fires 63 to grab lead at PGA Mexico Open

MEXICO CITY, Mexico -- Jake Knapp, a rookie making only his ninth PGA Tour start, fired an eight-under-par 63 on Saturday (Sunday, Manila time) to grab the lead after a record-setting third round at the Mexico Open.

The 29-year-old American birdied seven of the first nine holes for a course-record 7-under 28 on the front side at Vidanta in Puerto Vallarta.

A birdie-birdie finish gave Knapp 11 birdies against three bogeys on the day to match the 54-hole tournament scoring record of 19-under 194 set last year by winner Tony Finau.

That was good enough for a four-stroke lead over Finland's Sami Valimaki, another PGA Tour rookie in only his 11th start on the circuit, with Canada's Ben Silverman, Sweden's Henrik Norlander and American Chan Kim sharing third on 201, seven strokes adrift.

World number 101 Knapp, who shared the lead on 11-under when the day began, birdied six of the first seven holes, reeling off four in a row from the fourth, and birdied the ninth to seize command, telling himself to stay focused as the birdies fell.

"Just keep it going, stick to the process, do what we've been doing," Knapp said. "Kept saying I've been hitting the ball well, just keep giving myself opportunities and get some putts to drop and was able to do that."

Knapp, who produced his best PGA finish with a share of third earlier this month at Riviera, has won three times on a Canadian developmental tour and will rely on years of past efforts to cope with Sunday pressure in the biggest round of his career.

"I've been playing professional golf for a while and had plenty of good stuff and bad stuff," he said.

"What happened at (Riviera), I have that to lean back on, and some experiences on the Korn Ferry and Canadian tours and all that, so that will all be a part."

Knapp opened with back-to-back birdies, hitting his approach at the first from the left rough to just inside three feet of the hole, then blasting his approach to four feet at the second.

Knapp sank a birdie putt at the fourth from just inside 17 feet, followed with a 24-foot birdie putt at the par-3 fifth, another from just outside five feet at the par-5 sixth and made a five-foot birdie putt at the par-4 seventh after