By Lerpong Amsa-ngiam
The 2013 Rookie of the Year carded a final round 68 for a total 12 under-par-272 to win the par 71 US$1.5 million tournament.
In the past, Moriya came close to winning several times but would come short on the final day. However, the elder Jutanugarn , who finished second at the LPGA Thailand in Pattaya in February, did not show any signs of nerves on Sunday as she appeared in solid concentration despite having late bogey on the 16th.
Ariya, left, hugs her sister Moriya Jutanugarn after she saves a par putt for her first LPGA title.
The 23-year-old from Bangkok became the second Thai to win an LPGA title after her sister and former world No 1 Ariya Jutanuagrn won the Yokohama Tire LPGA Classic in Alabama in May 2016.
Moriya and Ariya now join Annika and Charlotta Sorenstam as the only sisters to have won on the LPGA.