Schauffele made birdie on his final three holes Sunday, the last one a two-putt birdie from about 30 feet on the par-5 18th hole to beat Tony Finau in a sudden-death playoff and win the HSBC Champions.
Schauffele rolled in a long birdie putt on the 16th and momentum until his second shot went into the water on the 18th, though he scrambled for par for a 69. "Just got to put that last couple holes behind me and come out a little bit angry tomorrow".
Matt Fitzpatrick had five straight birdies to overcome a rough start and post a 67.
Rory McIlroy finished 24 shots behind victor Xander Schauffele at the WGC-HSBC Champions in Shanghai.
HSBC Champions is contested at Sheshan International Golf Course in Shanghai, China. At the Open Championship at Carnoustie, Scotland, Schauffele and Finau played together for two rounds and both finished in the top 10, with Schauffele edging Finau by two shots, finishing in a tie for second while Finau tied for ninth.
The South Korean-born New Zealander had five birdies on her front nine then stalled somewhat on the back nine until an approach to one foot on the par-4 17th, a shot she called "one of the best of my career", resulted in a birdie.
He is joined on the score by Northern Ireland's Rory McIlroy.
Brooks Koepka, in his debut at No. 1 in the world, didn't deliver much excitement.
Rose, the 2018 Fedex Cup champion, overhauled an eight-shot deficit to win the tournament a year ago and so will still have hope of retaining the title and dethroning Brooks Koepka as world No. 1.
Reed, a seven-time victor on the PGA Tour whose only victory in the World Golf Championships came in the 2014 WGC-Cadillac Championship, collected four birdies on each nine, including a 25-foot birdie putt on the last hole. Those two wins were pretty close in my rookie year, and I didn't really know what I was doing.
By the end of the round, everything was going his way.
"I felt really good about every part of my game mentally, physically".
So he turned the club-face and conjured up a left-handed clearance.
"I knew I was still playing well and there was a lot of golf to be played", said Finau, who proved an inspired captain's pick for the US in last month's crushing Ryder Cup loss to Europe. "You practice, you play hard, and you do everything that you can to get in this position and it honestly is a great feeling to pull it off".