Schwarzer won £3.2million for the inaugural LIV Tour event Credit: Getty

Schwarzer, three clear overnight, held off fellow South African Hennie Du Plessis with a final round of 72 to win by just one shot at the Centurion Club and the £3.2m winning cheque.

The world number 126 also took a £608,000 share of the team prize.

It came as 2018 Masters champion Patrick Reed and Pat Perez were unveiled as the latest recruits to the breakaway tour.

But Schwarzer's victory was overshadowed by a savage attack on the five big US stars who have signed up to the LIV Tour from 911familiesunited.org, a coalition of families and survivors of the 2001 attacks.

Some 15 of the 19 September 11 terrorists, who killed 2,977 innocent victims, were Saudi citizens.

And in a letter sent to the agents of Mickelson, Johnson, Bryson DeChambeau, Reed and Kevin Na, organization chair Terry Strada said: “You are all Americans, keenly aware of the death and destruction of September 11.  

“Whether it was the appeal of millions of dollars of hard cash, or just the opportunity to prosecute your professional grievances with the PGA, you have sold us out.  

“This is a betrayal not only of us, but of all your countrymen.”

She added: “I feel compelled to help you understand the level of depravity the Kingdom engaged in when it knowingly sent government agents here to establish the support network needed for those hijackers.

“The Kingdom that has spent 20 years in denial: lying about their activities, and cowardly dodging the responsibility they bear.  

“Yet these are your partners and you appear pleased to be in business with them.

“The Saudis care about using professional golf to whitewash their reputation, and they are paying you to help them do it.”

Schwarzel admitted: “Never in my wildest dreams did I think we could play for so much money in golf. 

“It’s a historical moment. It’s awesome.”