It's only been a year since she made her LPGA debut, but Korea's Park Sung-hyun, just 24 years old, is already the world's best female golfer.
She becomes the first LPGA rookie to ever rise to the pinnacle of the sport.
The news comes after the Rolex Women's world rankings were updated on Monday, and despite her finishing in 19th place at the Hite Jinro Championship, a KLPGA Tour event.
Park dethrones her fellow South Korean Ryo So-yeon at the top of the rankings.
She also becomes the fourth South Korean to top the world rankings, after Shin Ji-yai , Park In-bee and Ryu.
"I was asked when I would become world number one, but I honestly don't know. Being in this position still hasn't hit me yet. I'm hoping to reach the top by continuing to develop my skills."
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Park has won two tournaments this season, including her first major title at the U.S. Women's Open, and recorded five top-10 finishes in nine starts.
Her next goal is winning the Vare Trophy, awarded to the player with the lowest scoring average for the season.
She is only zero.zero-2-2 strokes behind Lexi Thompson of the U.S. with just two more tournaments remaining.
Park's next appearance is at the Bluebay LPGA China that begins on Thursday.
Park, Ryu So-yeon and Lexi Thompson are all set to compete.
Park Hee-jun, Arirang News.