Hinako Shibuno of Japan finished with a birdie to win the Women's British Open golf tournament by one shot over American golfer Lizette Salas as she wrapped up a stunning major championship debut in Little Brickhill, UK on Sunday.

The 20-year-old Shibuno, a rookie on the Japan LPGA Tour who was playing for the first time outside of her country, birdied five of the final nine holes in a 4-under 68 and 18-under 270 overall.

"I was also thinking about if I were to make this putt, how I was going to celebrate," Shibuno said of approaching the 18th. "Eat a lot of sweets."

Largely unknown before the championship, Shibuno — nicknamed "Smiling Cinderella" — started Sunday with a two-stroke lead but lost it with a double bogey on the par-4 third. She bounced back with birdies on Nos. 5 and 7 before a bogey on the 8th at Woburn Golf Club.

"Now that I've won, I think a lot of the Japanese people will know me, but in actuality, I just wanted to live a quiet life," Shibuno said.

"I was looking online and I did see that it's been 42 years since a Japanese player has last won. I do feel that I have accomplished something great, but I really don't know the reason why I was able to accomplish it."

South Korea's Ko Jin-young, who was seeking her third major title of the year after winning the Evian Championship last week, was two shots back in third after a bogey-free 66.

"I had a little pressure, but I like that pressure," Ko said.