TAIPEI, Sept 30, 2012 (AFP) - Tsai started the day with a six-shot lead courtesy of a 65 in the third round at the Taiwan Golf and Country Club and it proved to be enough as he defeated closest rival Antonio Lascuna of the Philippines by four shots.
Lascuna's 73 saw him miss the chance to take advantage, with Tsai's fellow Taiwanese Chan Yih-shin in tied third with David Lipsky of the United States. Lipsky shot a 67, the best score of the day in the $600,000 Asian Tour event.
Tsai, who registered a winning total of four-under-par 284, told the Asian Tour that he barely slept the night before, so nervous was he about finishing off the job.
With only a three-hour night's rest, he struggled early in the round. He was four-over after 15 holes but gained some momentum when he sank a huge 30-foot birdie putt on 16.
"Honestly I couldn't sleep last night. I was wondering if I could make it to the end. I felt like I was still sleeping when I was on the first tee box," said Tsai, who pocketed $120,000.
"It was only when I finished 18 holes that I knew my dream had come true."
"The wind was blowing all over the place and I wasn't the only one who was struggling. I guess I'm quite lucky to have won this," added the 44-year-old Tsai, who won the Mercuries Taiwan Masters in 2002.
Lascuna, who claimed his second runner-up finish in six seasons on the Asian Tour, stayed in touch with the leader for most of the round before three-putting for bogey on the last.
"I saw the scores and I knew I had a chance to win. But I was playing par golf for most of the second nine and couldn't score. I'm still happy with my result. I haven't been in this position for a long time," said the 41-year-old, who is still searching for a first Asian Tour win.
Chan, a two-time Asian Tour winner, narrowed Tsai's lead to two shots at one point but slipped back with a bogey on 16 and a double bogey on 18.
Scores after round 4 of the Mercuries Taiwan Masters (par 72)
284 - Tsai Chi-huang (TPE) 74-69-65-76
288 - Antonio Lascuna (PHI) 70-73-72-73
289 - David Lipsky (USA) 72-74-76-67, Chan Yih-shin (TPE) 74-74-70-71
290 - Danny Chia (MAS) 72-72-72-74
291 - Sung Mao-chang (TPE) 72-75-75-69, Angelo Que (PHI) 70-75-75-71
292 - Baek Seuk-Hyun (KOR) 70-73-71-78
293 - Thaworn Wiratchant (THA) 73-77-73-70, Adilson Da Silva (BRA) 73-72-77-71, Lu Chien-soon (TPE) 77-70-75-71, Sam Cyr (USA) 73-76-72-72, Gaganjeet Bhullar (IND) 75-74-68-76