Branden Grace of South Africa holds the championship trophy on July 2, 2022 in North Plains, Oregon. Photos: VCG

Branden Grace grabbed five of his eight birdies on the back nine on Saturday to pull away for a two-shot win in the Portland LIV Golf Invitational and capture the $4 million first prize.

The 34-year-old ranked 128th in the world pulled level with Carlos Ortiz with a birdie at the 13th, then birdied the 15th, 16th and 17th to secure the win in the second event of the controversial Saudi-funded series, which has raised the hackles of the established US PGA Tour and DP World Tour.

But controversy appeared far from Grace's mind as the celebratory champagne was sprayed on the 18th green at Pumpkin Ridge outside Portland, Oregon.

"This new format, everything is amazing and everybody is having a blast," Grace said after the win in the 54-hole event in which there is no cut and all 48 entrants earn some piece of a purse of more than $20 million.

Grace carded a final-round 65 and finished two strokes in front of Mexico's Ortiz, who closed with a three-under-par 69.

Two-time major winner Dustin Johnson, at 17th in the world the highest-ranked player so far to bolt for the new series, started the day tied for the lead with Ortiz but finished tied for third with compatriot Patrick Reed on nine-under.

Johnson carded a one-under-par 71 while former Masters champion Reed moved up with a five-under 67 that included a chip-in eagle at the 17th.

The golf event drew enthusiastic crowds, organizers saying Pumpkin Ridge was sold out on Saturday without offering an attendance figure.

Grace had taken the outright lead with his birdie at 15 when his tee shot at 16 skipped through the fairway into a strip of rough alongside a cart path.

His second shot went through the green, but he strengthened his grip on the lead by chipping in for birdie.

Branden Grace plays a shot on July 2, 2022 in North Plains, Oregon. Photo: VCG

The team title went to the All-American quartet of Johnson, Reed, Tolar Gooch and Pat Perez, each pocketing $750,000 in addition to their individual earnings.

The third LIV Golf event is scheduled for July 29-31 at Trump National Golf Club Bedminster in New Jersey.

England's Paul Casey, ranked 26th in the world, revealed Saturday he had signed up to make his LIV Golf debut there, but the turmoil sparked by the rebel series promises to continue.

The 44-year-old Englishman is a three-time winner on the PGA Tour and 15-time winner on the European Tour but has not played since March due to injury.

"LIV Golf continues to attract the best players in the sport as it builds increasingly competitive fields with each event," LIV Golf CEO Greg Norman said in a statement.

The PGA Tour issued suspensions seven members and former members who made their LIV Golf debuts in Portland, including Ortiz, Reed, four-time major winner Brooks Koepka and former US Open champion Bryson DeChambeau.

And DP World Tour chief executive Keith Pelley slammed players - including Ian Poulter and Lee Westwood - who threatened legal action if the fines and suspensions imposed on them after they played the inaugural LIV Golf event in London weren't rescinded.

"Before joining LIV Golf, players knew there would be consequences if they chose money over competition," Pelley said.