The win marks the first victory for DeChambeau at one of golf's major championships.
Viera bagged his second with a stunning free kick in the 56th minute, before Cedric Bakambu added the fifth in the 85th minute.
She had hoped to make her comeback at Roland Garros, the main draw for which begins on September 27 and runs through to October 11, but has withdrawn from the event last week.
Leandro Martinez gave the hosts hope by combining with Cristian Colman and beating goalkeeper Cesar at his near post after some sloppy Flamengo defending.
"We were the better side, that's for sure. We had lots of chances to score several goals in the first half, but it was still tight because Nice also had chances after our first two goals. But Keylor was exceptional," said PSG coach Thomas Tuchel.
"I'm grateful for the effort of the players because it wasn't easy," Torrent told reporters after the clash at Estadio Monumental.
"I am shocked and saddened to learn of the death of eight young sons of our great football family who died following a car accident on Saturday. I hasten to extend to you, on behalf of all members of the CAF Executive Committee, the sincerest condolences and I wish a speedy recovery to the injured," he said.
Despite the likely return of some familiar faces, Queiroz hinted at possible surprises in his squad.
The CONMEBOL zone qualifiers had been scheduled to begin in late March but were suspended amid the COVID-19 pandemic. Enditem
The second half saw Wolves take the game to Manchester City, with Adama Traore looking for space behind their back line and the home side got back into the game with 12 minutes left to play when Raul Jimenez headed home an excellent cross from close range.
The UAE Team Emirates rider, who will turn 22 on Monday, became the first Slovenian to win the world's elite road cycling event. Meanwhile, the rookie also claimed the polka dot king of the mountains jersey and the best U-26 rider's white jersey.