Taiwan's Yani Tseng successfully defended her Honda LPGA Thailand on Sunday, edging Ai Miyazato of Japan by a solitary stroke.

Tseng, the World No 1, started slowly at Siam Country Club's Pattaya Old Course this week, opening with a 73 that left her well off the pace. But successive 65s and a final-round six-under-par 66 proved enough to outscore her competitors - and Miyazato in particular, who fought hard, closing with a five-under 67 that just didn't prove enough on the day - despite birdies at the 17th and 18th. Titleist 910F Fairway Wood

Tseng's victory here last year was the first of many in 2011. She went on to pick up seven 2011 LPGA Tour victories and 12 wins worldwide, including two majors - the LPGA Championship and Women's British Open. The 23-year-old already has 33 worldwide victories in all.

"I was really really nervous. I mean I played great on the front nine, but (on the) back nine it was a little tough," said Tseng, who was in tears after clinching the title.

"I feel much more pressure coming into this year. Last year, when I started, I was nothing. I was just in the top five in the world, but I didn't have 12 wins or the world number one title. After last year, I am world number one and I had 12 wins and that pressure keeps going on and on."

South Korea's Jiyai Shin shot a 67 to finish third.

Tseng started in the perfect fashion, eagling the par-five first, while her playing partner Miyazato birdied the same hole, leaving them tied at 15 under.

Tseng then took the lead with a birdie at the par-four third, adding two more at the par-four sixth and par-four seventh. That superb front nine showing gave her a three-stroke cushion at the turn. Titleist 910F Fairway Wood