The 27-year-old American started the final round in Sylvania, Ohio four shots behind overnight leader Lydia Ko.

But Kang fired six birdies against three bogies to reach 15-under par and leapfrog the New Zealander, who double bogied the final hole to share second place with England’s Jodi Ewart Shadoff.

“I'm really proud of all the work that I did during the off time, all the work that I did with (coach) Butch (Harmon) and all the workouts that I put in,” Kang said.

“I'm really proud of all the work that I did during the off time, all the work that I did with (coach) Butch (Harmon) and all the workouts that I put in.” – Danielle Kang

“I'm excited to see what she's (Ko) going to bring to the table for the rest of the year. She's been playing really good.”

Former World No.1 Ko was poised to end two years and 44 tournaments without a victory.

But the 23-year-old bogied the 14th and 16th holes, before further damage was inflicted at the closing par-5.

“At the end of the day, obviously it wasn't the finish that I wanted,” Ko said.

“But Danielle played great. It's not like she played mediocre and I played mediocre. She played good golf.”

Perth product Minjee Lee (68) reached 13-under to finish fourth and record the 50th top-10 of her career, while Katherine Kirk (77) shared 65th place.