Westwood carded an eagle and 10 birdies at the Amata Spring Country Club near Bangkok to take a five-shot lead over American John Daly after the first round.
Westwood's round equaled the Asian Tour record as he took advantage of superb play from tee to green by holing a string of putts.
"It's one of the best rounds I've ever played. I've never shot a 60 before," Westwood told AFP.
"I was just on a roll. I hit a lot of fairways and my putting was good. I've been working a lot on my putting," he added.
Former major winner Daly gave brave chase with his round of 65, which included five birdies and an eagle.
Gregory Bourdy of France and Thailand's Thaworn Wiratchant were tied for third after 68s with U.S. Masters champion Charl Schwartzel in a 10-strong group on 69.
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