[4] She made history by becoming the youngest-ever champion at the 2009 BWF World Junior Championships at 14 in Malaysia by beating her compatriot Porntip Buranaprasertsuk.

[6] She also reached the 2009 SEA Games women's singles final, but lost to her compatriot Salakjit Ponsana.

In 2010, at the age of 15, she successfully defended her title at the 2010 BWF World Junior Championships in Mexico by beating Misaki Matsutomo.

[7] Her successful run continued after she won Smiling Fish International event, beating teammate Rawinda Prajongjai.

[11] Intanon participated in BWF World Championships and lost in the third round to eventual winner Wang Yihan.

[12] She became the most successful player ever in individual events at the BWF World Junior Championships, winning the women's singles title for the third straight time by defeating Indonesia's Elyzabeth Purwaningtyas.

[13] She won the India Open Grand Prix Gold where she received a walkover against Porntip Buranaprasertsuk in final.

[19] She qualified for the 2012 BWF Superseries Finals and won all of her group matches in straight games against Juliane Schenk, Tine Baun and Saina Nehwal.

[22] She lost in the final of the Swiss Open Grand Prix Gold after being defeated by Wang Shixian.

[23] She won her first Superseries tournament by beating Juliane Schenk 22–20, 21–14 in the India Open[24] to become the youngest-ever Superseries winner at the age of 18 years, 2 months and 22 days (she held this record for 6 months until Akane Yamaguchi won the 2013 Japan Super Series at the age of 16).

Intanon withdrew from both the Indonesia and Singapore Opens to recover from a foot injury and prepare for the BWF World Championships.

[27] In the final, she won the title, beating world number 1 and Olympic gold medalist Li Xuerui 22–20, 18–21, 21–14.

[34] She qualified for the Superseries Finals in Dubai but failed to pass the round-robin stage after losing group matches against Tai Tzu-ying and Akane Yamaguchi.

In 2015, Intanon made a comeback by reaching the final of the India Open for the second time but lost to her opponent Saina Nehwal.

[35] A month later, she became the first Thai singles player to win the Asia Championships by defeating Li Xuerui in the final 20–22, 23–21, 21–12 in China.

In June, she won her first Superseries Premier title by beating Yui Hashimoto of Japan in straight games at the Indonesia Open.

By winning three Superseries in a row, she also rose to the number 1 spot in the world rankings, becoming the first Thai to achieve this feat.

In the Superseries Finals, Intanon lost in straight games to Sung Ji-hyun and Tai Tzu-ying, and retired injured against He Bingjiao.

[52] She qualified for the season-ending Superseries Finals, where she defeated Sung Ji-hyun and Tai Tzu-ying and lost the third group match to Chen Yufei.

[53] At the beginning of the year, Intanon won the Malaysia Masters Super 500, beating Tai Tzu-ying in the finals, winning 24–22 in the third set.

In 2019, Intanon won the Malaysia Masters Super 500, defending her title by winning in straight games for all her matches, including the final where she beat Carolina Marín.

[65] The BWF statement reads: "The ethics hearing panel determined Ms. Ratchanok Intanon committed an anti-doping rule violation, but as the athlete was able to demonstrate that her adverse analytical finding was related to the ingestion of meat contaminated with clenbuterol, she was found to bear no fault or negligence for the violation, and thus no period of ineligibility has been imposed on her."

She withdrew from the competition and the rest of the 2023 tour due to the ankle injury she suffered in the Hong Kong Open.

[70] Intanon competed for the fourth time at the Olympics in the 2024 Paris, but again failed to win a medal after losing in the quarter-finals to Gregoria Mariska Tunjung.

She was born in Yasothon Province in the northeast of Thailand, but moved at the age of three months with her parents, who worked at the Banthongyord sweets factory in the Bang Khae District of Bangkok.

"I wanted to be a national player like my older friends and play for the country, because that was the only way I could help my parents to improve our status and leave poverty," she has said.