Heavy rainstorms during the second round forced a marathon golf scenario for many players to battle through along with the warm temperatures and humid playing conditions.
With a five stroke lead heading to Sunday's final round Yang played steady golf and despite pressure being applied by 2011 US Open victor So Yeon Ryu held firm to claim her second Honda LPGA Thailand crown.
"Wasn't easy with rain delays and 4:00 a.m. wake-up calls two days in a row", Yang said after the tournament according to a report put out by organisers.
Yang made a complete mess of her chip from beside the green on the par-four 14th but breathed a huge sigh of relief when she drained a hard 20-foot downhill putt to match Ryu's par and keep her advantage at a manageable three shots.
Palmer had seven birdies and a pair of bogeys to finish on nine-under 131 along with Bryan (67), one better than fellow-American Rickie Fowler. "Tomorrow [today] again I'll, you know, finish third round".
After making a slow start to the season last week at the Australian Open were she finished in a tie for forty sixth, Ko hit her straps on moving day in Thailand.
Jutanugarn, the Thai No. 1 and ranked second in the world, had six birdies while Yang, the 2015 champion, had seven birdies and a bogey at the Siam Country Club Pattaya Old Course.
"I love this place, I love the people here and I always seem to play well", Yang said. The Japanese is the first and only player to win the HSBC Women's Champions title after victory in Thailand, going back-to- back in 2010.
Amy Yang is a victor again, and she did it in style. "And with my parents, spending time with them here, it's just great every time".