STA. ROSA, Laguna — Miguel Tabuena charged his way to an imposing six-shot lead after firing a record eight-under 64 as the megabuck TCC Invitational got going on Tuesday.

In the aftermath of Tabuena's dazzling display of shotmaking on the challenging course, left to do a lot of catching up is Korean Mon Seong Kim.

After a misfire on the opening hole, Tabuena stormed back with a kind of resolve that wins big-time championships with birdies on the next two, followed by a three-birdie binge from No. 6.

He sustained his assault on the 7,735-yard course with terrific ball-striking and tremendous iron play and putting, birdying four of the first seven holes at the back to assert his control over the elite 30-player field, which includes former champions and top finishers from last year's Philippine Golf Tour Order of Merit ranking.

"I didn't expect to play like this but sometimes, with no expectations, you play better," said the 2017 champion, who birdied all four par-5s, underlining his exceptional start on the course where he triumphed last November with an imposing 4&3 victory over Lascuña in the final of the ICTSI The Country Club Match Play Invitational.

"It wasn't as windy in the morning so the course actually played easier for the rest of the field. I would like it to be windier but I took advantage of the less wind and posted a good score at the frontnine and kept the momentum," added Tabuena, who set up birdies from as close as three feet and buried a couple from as far as 25 feet.

Tabuena's 64 also broke the 67 posted by Micah Shin in the third round en route to winning this same event in 2018.

Kim roared back with three birdies in the last five holes to buck a bogey on No. 13 and post a 70, joining Tony Lascuña and Sean Ramos at second while longshot Rico Depilo holed out with a bogey to sink to solo fifth at 71.

Lascuña, the 2004 winner of this flagship tournament of the PGT, put in a four-birdie, two-bogey card for a 70 while Ramos battled his way back from a two-over card with four birdies in a seven-hole stretch from No. 8.

While Tabuena thrived, the majority of the field struggled, including reigning Order of Merit winner Jhonnel Ababa, who also bogeyed the challenging closing hole to end up with a 72, sliding to joint sixth with Guido van der Valk and Clyde Mondilla.