Reid's only mistake on the back nine was a bogey on the par-3 17th, which cut her four-shot lead in half when Jennifer Kupcho and Jennifer Song each made birdie.

Katherine Kirk was the leading Australian finishing nine shots off the pace in a tie for 10th after a final round two-under.

Compatriot Minjee Lee fired a four-under par 67 to finish a further two shots back at even, while Hannah Green shot four-over to finish three over.

In her last start two weeks ago, 33-year-old Reid lost a two-shot lead in the Cambia Portland Classic. When she rapped in her two-foot birdie putt on Sunday, she dropped her putter and the celebration was on.

Reid won her maiden LPGA Tour title at Seaview GC. PHOTO: Michael Cohen/Getty Images.

Reid's 72-hole total of 265 was her best on the LPGA Tour and her victory added to six previous wins on the Ladies European Tour.

Kupcho, the former NCAA champion at Wake Forest who last year won the inaugural Augusta National Women's Amateur, lost ground with a double bogey on the par-3 8th and had a shot roll back to her feet on the 16th for a crucial bogey. She closed with two birdies for a 68 to finish alone in second.

Song kept pace with Reid until a two-shot swing on the par-3 11th – Reid made her fourth birdie in the last five holes, while Song made bogey. She closed with a 69 and finished third.

Lexi Thompson, the defending champion who has gone nearly 16 months without a victory, shot 68 and tied for 13th.

The KPMG Women's PGA Championship is next week at Aronimink outside Philadelphia, where Green is the defending champion.