Choi, runner-up to Tseng as Rookie of the Year in 2008, closed it out to take the US$255,000 winners' cheque, sinking five birdies for her first win on the LPGA Tour since joining.

Fellow Korean Ran Hong was four shots back in third while Kim Song-Hee was fourth and Shin Jiyai fifth.

But it was a tournament to forget for Mexican world number one Lorena Ochoa, who ended at six-over-par and a massive 16 shots behind the winner.

Defending champion Candie Kung of Taiwan also had a horror weekend, finishing alongside Ochoa.