Scott Barr is one shot behind in second place, followed by Jason Dawes and Thaworn Wiratchant, who both shot 68.
Pavin's 71 included 17 pars and a birdie on the fifth hole. His Vietnamese wife, Lisa, was his caddie.
Pavin said he needed to improve his putting.
'I just didn't make many putts. I hit a lot of good ones but that's how it goes sometimes,' he said. 'Conditions were perfect for scoring.'
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