Atthaya Thitikul is used to setting new records and has been one of the fastest-rising golfers over the past few years.
The 16-year-old from Ratchaburi became the world's No.1 amateur golfer on Wednesday, moving up four places to overtake American Andrea Lee.
The achievement came after her win at the Ladies European Thailand Championship in Pattaya last Sunday.
She is Thailand's first-ever player, male or female, to reach the top of the world amateur rankings.
"Certainly, I am very happy to be the world No.1," she said.
Jeen poses with the Ladies European Thailand Championship trophy in 2017.
Nicknamed Jeen or Jeeno, Atthaya comfortably beat some of the best professionals from the Ladies European Tour (LET) for her success in the world-renowned seaside resort town with a tournament record score of 22-under 266.
Her score of nine-under 63 in the third round was one stroke better than the previous course record, an eight-under 63 recorded by Scott Vincent from Zimbabwe in the third round of the 2018 Queen's Cup.
Amazingly, the best 18-hole score of her young amateur career so far was a final-round 12-under-par 60 in last year's World Junior Girls' Championships in Canada.
The teenager holds the Women's Amateur Asia-Pacific trophy last year.
Atthaya finished five shots ahead of Germany's Esther Henseleit at the Phoenix Gold Golf and Country Club last Sunday, having built a commanding eight-stroke advantage after three rounds.
With the triumph, she became the youngest-ever player to claim two LET titles at 16 years, four months and three days.
Two years ago, she won the inaugural Ladies European Thailand Championship at the same course and became the youngest-ever player to win in a professional event on a major tour.
"It feels unreal," Atthaya said last Sunday.
"Since I won this tournament two years ago I have kept working hard and I've grown in confidence."Youth Olympic champions Atthaya and Vanchai Luangnitikul. Apichit Jinakul
Her rise on the international stage began in 2017 when she was invited to play at the Honda LPGA Thailand and finished 37th out of 66 competitors that included some of the world's top female players.
She then won the Ladies European Thailand Championship and played at the Women's British Open and the Evian Championship.
She also swept the individual and team gold medals at the 2017 SEA Games in Malaysia.
Atthaya and Kanes Nitiwanakul with the Smyth Salver trophy at the 2018 Women's British Open.
In 2018, she was crowned champion of the inaugural Women's Amateur Asia-Pacific Championship in Singapore after winning a four-way play-off.
With the triumph, she received a ticket to the HSBC Women's Champions held on the same course the following week and finished eighth in the LPGA Tour event.
Youth Olympic champions Atthaya and Vanchai Luangnitikul. (Photo by Apichit Jinakul)
She went on to become the low amateur at the ANA Inspiration and claimed the the Smyth Salver as the leading amateur at the Women's British Open.
Following an unsuccessful campaign at the Asian Games in Indonesia, Atthaya bounced back by winning the gold medal in the mixed team event at the Youth Olympics in Argentina with Vanchai Luangnitikul.
It was Atthaya who led the team to glory with two birdies in the final two holes.
"I thought we were heading for the silver medal," Vanchai said after the victory.
"Jeen is the hero."
Despite her swift rise, Atthaya admits that there is still room for improvement, particularly in her short game and chipping.
Her family wanted her to turn professional last year but she wanted to become better before playing for money.
"I thought my game was still not good enough, so I told them to wait for another year so that I could improve my game and gain more confidence," she said.
"At the moment, I do not feel nervous playing against the pros. But when I decide to turn pro, I want to be a contender for the title and not just for the sake of playing. I don't want to be a professional and then lose my playing rights.
"I now feel I am a better golfer. However, there are still many factors to consider. Next year may be a good time for me to turn pro."
Among those who have followed Atthaya's rise closely is Kanes Nitiwanakul, the director of team development at the Thailand Golf Association (TGA).
"The key to her success if she is always happy and enjoys the game. She always plays according to plans," he said.
"Atthaya is a quick learner and strong mentally. She has made fast progress and rarely shows nervousness on the course."
According to Kanes, since joining the Thai national team three years ago, Atthaya has won 18 of 19 TGA ranking tournaments she took part in.
In fact, she won all her first 14 tournaments.
"Her results are amazing. I'd say that she is a genius," Kanes said.
Kanes said Atthaya's nine-shot win at the 2017 Taiwan Amateur Open boosted her confidence.
Atthaya and Kanes Nitiwanakul with the Smyth Salver trophy at the 2018 Women's British Open.
After her first triumph at the Ladies European Thailand Championship, she carded a course record nine-under-par final round to win the Junior Dutch Open by eight shots with a tournament record score of 20-under 268.
Atthaya, centre, and her teammates celebrate with their gold medals at the 2017 SEA Games. credit
At the 2018 World Junior Girls' Championship in Canada, she was eight shots off the pace after three round but managed to win by two strokes after firing a course record 12-under-par final round.
"I think her best is yet to come," Kanes said.
Thanks to her win in Pattaya last Sunday, Atthaya has earned berths at the Evian Championship (July 25-28) and the Women's British Open (Aug 1-4).
Unfortunately, she won't be playing at the Evian because she has entered a tournament in Japan.
"I have to honour my promise," she said.
At the Japan tournament, she will defend her amateur title at the Women's British Open at Woburn.
Atthaya, centre, and her teammates celebrate with their gold medals at the 2017 SEA Games.
Asked about her plans for the rest of the year, Atthaya said she will take part in the SEA Games in the Philippines and then join the LPGA Q-school.
Atthaya is expected to become Thailand's next golfing superstar and follow in the footsteps of former world No.1 and two-time major champion Ariya Jutanugarn, who has so far bagged 10 LPGA Tour wins.
