The 19-year-old Yin won with a tap-in birdie on the drivable 17th hole. The victory in the Ladies European Tour season finale is her first on a major tour.
“I feel amazing,” Yin said.
Yin closed with a 5-under 67, saving par on the par-5 18th after finding the water, to match Kim (65) and France’s Celine Herbin (64) at 15-under 273 at Emirates Golf Club.
Yin and Kim birdied the 18th on the first extra hole, and Herbin was eliminated after hitting into the water with her third shot.