Ko replaces Morgan Pressel as the youngest major winner thanks to a final round of 63.
Lydia Ko’s Evian Championship win on Sunday has made her the youngest female major winner.
The New Zealander is 18 years and four months old, six months younger than the previous record holder Morgan Pressel.
Ko shot a final round of 63 to finish six shots clear of America’s Lexi Thompson, who will feature for Juli Inkster’s United States team in the Solheim Cup this month.
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With eight birdies and no dropped shots during yesterday’s final round, Ko made her move into the record books comfortably.
Afterwards she admitted she was pleased to now not have to answer any more questions about becoming the youngest major winner.
Speaking about her feelings on the final green, she said: “I didn’t totally cry-cry. But I kind of got a little overwhelmed, and I could kind of feel tears coming when Jason [Hamilton, her caddie] said, enjoy the moment, coming down onto the green.”
“I kind of felt back over the whole week and all the questions I’ve been asked. But in a way I was relieved. But to kind of have that putt go in, I think just everything dropped.”
Ko was also the youngest player in the sport to become world no. 1 back in February, when she topped the rankings aged 17.
Second placed Thompson paid tribute to Ko, saying the two fed off each other throughout the day.
She said: “She has a great personality, very laid-back and that helps her out on the golf course.
“I don’t even think she made a mistake. She was just so consistent today, just played fearless golf.
Inbee Park, winner of two majors this year, finished T8 and 11 shots back from Ko.
Pressel finished T11, with Stacy Lewis back in T16. England’s Charley Hull recorded a T38 finish with Solheim Cup team-mate Carlota Ciganda and opposition captain Inkster.