(Reuters) - U.S. Masters champion Danny Willett will pose a serious threat to compatriot Justin Rose's title defense at this year's Hong Kong Open after the Ryder Cup team mates confirmed their participation in the Dec. 8-11 tournament. Englishman Rose pipped Denmark's Lucas Bjerregaard by one shot last year and is keen for a repeat triumph at the event co-sanctioned by the Asian Tour, European Tour and Hong Kong Golf Association. Rose is on a high after becoming the first man in 112 years to win an Olympic gold in golf at the Rio Games. More...