Schauffele handed out defeat to opponent, Tony Finau in the play-off to emerge as the grand winner of the tournament.
The former became rookie of the year in 2016/17 after two titles on his debut year on the PGA Tour.
But Schauffele did just enough to beat Finau in a play-off to win the WGC-HSBC Champions in Shanghai in China.
Finau who was one of the few stars for the United States at the Ryder Cup had a three-shot lead.
And that was into the final day of the competition but Schauffele birdied the last two holes to force a play-off.
After which the 25-year-old then went ahead to birdie the sudden-death par-five 18th to pick up his third PGA title.
Britain’s defending champion, Justin Rose on his own part finished in the third position on the standings after final-round 72.
McIlroy 16 shots off WGC-HSBC Champions pace
Rory McIlroy has dropped 16 shots off the pace at the WGC-HSBC Champions in Shanghai, China with Tony Finau leading.
As a result, the former is now facing up to a long two days in Shanghai in the no-cut event.
McIlroy is now way beind after an error-strewn five-over 77 in the second round which took place on Friday.
The 29-year-old had actually reached the turn in 35 after three birdies and two bogeys.
But he bogeyed his 10th which was the first and he also triple bogeyed the next.
And that was aftermath of twice finding water and double-bogeyed 16.
Finau’s 67 left him three above English pair, Tommy Fleetwood (68) and Justin Rose (67) including overnight leader, Patrick Reed (72).
McIlroy’s problems at his 11th, the second, came after he had hit a perfect drive.
And that left him with only a short iron into the par five.
However, the world number five’s second shot flew over the green into a water hazard.
And in the wake of having mis-hit his chip, his ball trickled into the same hazard again.
The former world number one is in a share of 58th in the 77-man event.
And that is the case going into the final two days of the no-cut tournament.