Rory McIlroy believes his performance in the third round of the Kolon Korea Open brought about his downfall as he finished six shots behind winner Rickie Fowler.
The Northern Irishman was in a five-way tie for the lead following Friday's second round, but his two-over-par 73 on Saturday saw the US Open champion fall out of contention before he closed with a fine 64 to finish 10 under.
"It was a nice way to finish, but all the damage was done during the third round with a couple of bad holes in the middle of the round," he said. "Looking back on this week, I will rue my third round, which could have been a lot better."
He added: "If I had played a little better and shot a few under I might have had a chance, but Rickie has played fantastic this week and he deserves the win."
Korean Kim Meen-whee posted a level-par 71 to take third on seven under but Yang endured a disappointing final round as a 75 saw the veteran slip to fourth on five-under-par.