Xander Schauffele was rookie of the year in 2016-17 after two titles on his debut year on the PGA Tour
Xander Schauffele defeated Tony Finau in a play-off to win the WGC-HSBC Champions in Shanghai.
Finau, one of the few stars for the United States team at the Ryder Cup, took a three-lead lead the last day, but Schauffele birdied the last two holes to force a play-off.
The 25-year-old went on birdie's sudden-death par-five 18th to claim his third PGA title.
Britain's defending champion Justin Rose was the third after the final round 72.