The United States has seized the biggest second-session lead in the history of the Presidents Cup after a dominant day of four-ball play at Liberty National in New Jersey.
The two South Africans had won four matches at the 2015 Cup, and provided the lone victory for the Internationals on Thursday.
Grace will play with Leishman against Johnson and US Open champion Brooks Koepka in the anchor match.
Spieth and even Oosthuizen argued the common sense nature of the situation: Oosthuizen's ball was not going in the hole, and Day's birdie already had been conceded.
It's sad to say that barring an utter miracle and a complete turnaround in form from some of his players, Nick Price's men are staring down the barrel of another losing Presidents Cup campaign. Expect this USA duo to see the 18th hole for a third straight match.
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The best celebration came from the American team of Charley Hoffman and Kevin Chappell, who rode the bench on Thursday. Still 2-up with just four to play, it looked as though the Americans would drop the opening match in heartbreaking fashion.
So can his teammates, who have followed the script set out by USA captain Steve Stricker to win every session.
After all, there are a set of foursomes in the morning followed by fourballs in the afternoon on Day 3.
The Internationals entered Saturday morning's foursomes session six points down and squarely on life support, and under clear skies and cooler temperatures, the US pulled the plug on this 12th Presidents Cup, winning 3.5 of four points in the morning and pushing its lead to 11.5-2.5.
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The U.S. team is now taking a 5-wood to the global squad at the Presidents Cup, but it hasn't been without a spot of controversy thanks to golf's head-scratching rule book.
With the worldwide duo of Jason Day and Marc Leishman, the side's strongest team on paper, cruising to a 2-up lead through 10 holes, Kisner squared the match with a 30-footer for birdie at the 15th hole and Lefty, a captain's pick, rolled in a 15-footer for birdie on the final hole to complete a dominant day. The International Team is made up of players not from Europe.
United States 8, worldwide 2.
Hoffman and Chappell are Presidents Cup rookies and promptly earned a point. On the 15th and final hole of the match, Reed wanted to - we guess - motivate Spieth to hole his approach shot on the short par 4. But the Aussies fought back, taking a 1-up lead at the seventh hole with a chip-in birdie from Day.
This had the trappings of the closest match of the day, with each team winning two holes on the front nine and the match all square going to the back. Vegas birdied the next hole from 35 feet, and that's when Johnson took over.
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