Jutanugarn, who is from Thailand but rarely plays Siam Country Bay, would be the first player from the country to win the tournament on her home soil. Juntanugarn played a bogey-free round to record a 6-under, 66.
"I had a good start today, it was better than I expected," said Jutanugarn. "I just rested this offseason and ate Thai food at home."
Defending champion Amy Yang, who also won in 2015, is among six tied for second place after shooting a first-round 67. World No. 2 Sung Hyun Park also notched a 67, as is Brooke Henderson, who missed the cut last week.
Thompson bogeyed the par-4 fourth but also eagled No. 1 and had five birdies with only 28 total putts.
"I eagled the first hole and then birdied the second and it was great to get off to a good start," said Thompson. "This golf course is a lot of just hitting it in the fairway. Once you're there, it is also about the second shot."
Lee started the season with a victory and finished fifth last week at the Women's Australian Open. She shot 31 on her final nine, including a 35-foot birdie to wrap up play Thursday. She also sank a 50-foot putt for birdie on the No. 11.
Korda seeks her first win since 2015 and is coming back from offseason jaw surgery. Korda also closed her opening round with a fury, going birdie-eagle-birdie.
"Definitely a lot of rest, but it's just nice to be out there and be able to hit the shots again," Korda said. "I had a strong finish last year, and just kind of cap that off and then start today it's pretty nice. Started with an eagle, too, and I was like, damn."
Michelle Wie (68) landed in the pack of golfers who finished 4-under.
--Field Level Media