Record-breaking Chun heads Korean lock-out in Evian, Ariya Settles at 9th

Close to tears, the 22-year-old South Korean, said: "I can't believe I have just won the Evian Championship on 21 under. I'm not dreaming am I?"

Winner of last year's US Women's Open before she joined the LPGA Tour, she is now certain to win the season's Rookie of the Year award.

Chun claimed the four-shot win was a great team effort, thanking her caddie, David Jones, and her family and friends. "It is an individual sport, but I couldn't do it without great people around me," she insisted.

She needed the help of her team earlier in the year when she suffered a controversial back injury and had to miss over a month on Tour.

The injury happened at Singapore airport when fellow player Jang Ha Na's father lost control of a suitcase and it fell down an escalator. The incident caused an uproar in South Korea.

Chun admitted it was a very tough time.

"After the injury I was struggling with myself and my body and psychological problems," she said. "I was in a bad mood, a negative side."

But she got her love for the game back at the Olympics.

"I was having an inner struggle. It was going around and on and on. It was difficult for me to get out of that situation.

"But I got my passion back at the Olympics. Making the team was a huge goal and I was so proud to wear the national flag," said the player who finished 13th in Rio.

Chun made sure of the record score for a major with a great final hole.

She drove into the rough at the long par four and laid up with her second shot. But she then hit a 95 yard wedge shot to ten feet and holed out to spark the celebrations.

"I was so nervous coming down the last," she said. "But my caddie said to me 'make par and I'll buy dinner.' Now I feel like I am dreaming, I am so happy."

Thailand's Ariya Jutanugarn fired a total 7-under-par 277 to finish at joint ninth and missed the chance to win the Rolex Annika Major Award which went to world No 1 Lydia Ko of New Zealand.