As well as being up against a highly motivated and well prepared International team, the US players faced a steep learning curve to become familiar with a Royal Melbourne course most had never stepped foot on until Tuesday morning.
Tiger Woods will be the first playing captain in the Presidents Cup since American Hale Irwin in its inaugural edition in 1994.
Making the most of good scoring conditions in the morning, Coetzee started with two birdies and picked up three more shots from the sixth hole to surge ahead as he reached the turn in 31.
The 20-year-old Japanese rank outsider, who earned her nickname because of her radiant smile, rammed home a lengthy birdie putt of just under 20 feet at the final hole to edge out American Lizette Salas by one stroke.
Donald Trump and John Bolton are on different tracks when it comes to foreign policy, and that is particularly problematic when the US is beating the drums of war.
Despite two bogeys in the final three holes, a one-under-par 70 was enough to clinch the title on a day when most of the contenders struggled at Country Club of Charleston.
US President Donald Trump met with Japan's Emperor Akihito who took the Chrysanthemum Throne only three weeks ago, after his father stepped down in the first abdication in two centuries.
A month after claiming his 15th major title at Augusta National, Woods crashed back to earth in his first tournament appearance since, recording a five-over 145 total at Bethpage Black.
Masters winner Tiger Woods will play with defending champion Brooks Koepka and British Open titleholder Francesco Molinari.
The 23-year-old South Korean won last month's LPGA Founders Cup, captured her first major crown earlier this month at the ANA Inspiration and could claim her third title in five starts this week at par-71 Wilshire Country Club.
Tiger Woods completed one of sport's great all-time comebacks to end an 11-year major title drought at the Masters by claiming a fifth Green Jacket.
Phil Mickelson finished at 19-under 268, while Englishman Paul Casey (71) birdied the final hole for second place on 16-under.
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