America gained the upper hand from the opening day of the Presidents Cup after winning the tournament's first session for the sixth successive time.
The Americans, winners of nine of the prior 11 editions of the Cup, with one draw and just one worldwide victory back in 1998, wasted no time in asserting themselves at Liberty National Golf Club.
The final match of the day between was the most exciting as Phil Mickelson and Kevin Kisner split the point with the worldwide team of Marc Leishman and Jason Day.
"We're very comfortable around each other", Oosthuizen told Sky Sports.
In the opening match in New Jersey, Justin Thomas and Rickie Fowler beat Charl Schwartzel and Hideki Matsuyama 6&4.
For a short time it was 3-0 to the U.S., as Dustin Johnson and Matt Kuchar finally shook off Adam Scott and rookie Jhonattan Vegas to win 1up. The South Africans, who were 4-0 as a pairing two years ago in South Korea, were the one true bright spot for the team, beating Brooks Koepka and Daniel Berger, 3 and 1. Having almost pulled off a heroic comeback to steal a point, the Australian duo has to have walked off the course somewhat thankful to have gotten a half-point, but frustrated they couldn't close things out.
Friday features five matches of fourballs, followed by a full day of foursomes and fourballs Saturday and the decisive Sunday singles.
In all, 30 points will be on offer this week, with 15.5 needed to claim the Cup.
The par-3 10th hole was so hard to judge the wind that Scott hit a tee shot that sailed over the green into a hazard, while Spieth in the match behind him came up some 60 feet short of the hole in a bunker. The Americans were 3 up through seven holes, only to see the Australians win four straight holes with a par-eagle-birdie-par stretch.
"That was definitely a big turn of events", Fowler said of holing out. He is 4-9-1 in the alternate shot format.
Spieth and Reed never trailed, taking the lead at the second when Kim hit the Internationals' second shot into the water. He's the president of the United States.
"We are thinking that he is going to come out but he has not yet confirmed, and we don't know timing or all the underlying details". "We get confident in our reads and we put aggressive putts on it because we're OK with our partner making something coming back". It continued to go back and forth until Johnson and Kuchar took the lead on the 16th hole and held on for the 1-up victory.
But the Americans squared it at 17.
Oosthuizen and Grace secured the first point of the match for the worldwide team, winning by a 3 and 1 score. He missed as well and they shared the points.