Lynn needed his five birdies to offset three bogeys, as well as a double on the par-five 11th hole of the par-72 Beijing Honghua International Golf Club course just outside Beijing. Lynn finished at nine-under-par 207 after the third round.
Prayad Marksaeng of Thailand held onto a piece of second place with a 72 as well. India's Jeev Milkha Singh was tied with Marksaeng after shooting a five-under-par 67.
Casey's 70 tied him for third alongside Spain's Gonzalo Fernandez-Castano (68). The pair are two shots behind Lynn and one shot
ahead of Marcus Fraser (69), Peter Fowler (69) and Simon Wakefield
Last year, Casey won the event sanctioned by the European and
Asian tours on the first playoff hole.