The Chilean now has three wins in the last three months, starting with his Australian Open victory in December that allowed him to rejoin the DP World Tour and eventually put him on the path towards getting invited back to the Masters.

Niemann started his third season on the Saudi-funded league by opening with a 59 at Mayakoba and winning in a play-off over Sergio Garcia.

Now – after also finishing third in an Asian Tour event last week – he soars to the top of the points list with another win ahead of next week's LIV event in Hong Kong.

No-one got closer than two shots of Niemann in the final round at Royal Greens. Oosthuizen was the last challenger until a bogey on the 16th hole in his 67, while fellow South African Schwartzel had a 68.

Niemann also took a dig at the world rankings in his interview with LIV's broadcast team.

Asked if he was one of the leading favourites to win a major this year, he said with a grin: "How is that possible? I'm like 100 in the world!"

Niemann is actually No.72 in the world. The Official World Golf Ranking, in a vote cast by the organisations that run the majors, chose not to award LIV ranking points because of the small field (54 players) that functions as a closed shop with no qualifying.

"How is that possible? I'm like 100 in the world!" – Joaquin Niemann.

Niemann finished at 17-under 193 and earned $US4 million ($A6.1 million), giving him $US8,162,000 ($A12 million) in three LIV events this year.

Australian LIV newcomer Lucas Herbert's challenge on the final day never materialised, as he slumped to joint-22nd overall after a three-over-par final round of 73 took him to six under for the tournament.

The top Aussie turned out to be Matt Jones, who powered up the leaderboard into joint-14th on eight-under after a final round 66.

Cameron Smith had a disappointing tournament, finishing with a level-par 70 that left him at one under for the tournament, tied for 41st alongside his great Australian pal Marc Leishman.

Anthony Kim, who had gone 12 years without competitive golf until signing a deal with LIV Golf this week, had a 74 and finished in last place, 33 shots out of the lead.