2013 was Intanon's best year of her career.
She reached the finals of the 2013 All England Open Badminton Championships, losing to Tine Rasmussen 14–21, 21–16, 10–21.
She was the youngest ever singles finalist at the All England tournament.
She lost in the final again by getting defeated from Wang Shixian in the 2013 Swiss Open Grand Prix Gold.
She won her first Superseries tournament by beating Juliane Schenk 22–20, 21–14 in the 2013 Yonex Sunrise India Open 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 Open at the age of 16).
She again reached the finals of the SCG Thailand Open 2013.
This time she won the title, beating Busanan Ongbumrungpan 20–22, 21–19, 21–13 to become the first Thai ever to win the women's singles title at the Thailand Open since it was first held in 1984.

She withdrew from both the Indonesia Open SSP and Singapore Open SS to recover from her foot injury and prepare for the BWF World Championships.
In World Championships in August, Intanon was seeded 4th.
She reached the quarterfinals of this tournament for the first time, where she defeated Carolina Marín in a very hard-fought encounter.
Her semifinal path was relatively easy, where she won against P. V. Sindhu in 2 games.
In the final, she won the title, beating out world number 1 and Olympic gold medalist Li Xuerui 22–20, 18–21, 21–14 She was the first-ever Thai player to be the World Champion.
At the age of 18, she was also the youngest singles World Champion ever.
She became the World Champion while still being eligible to play in the 2013 BWF Junior World Championships in Bangkok.
After the World Championships, she injured her back, which affected her performance and due to that, she failed to qualify for the 2013 BWF Super Series Finals and finished 2013 as the World number 3.
She was awarded the "2013 Best Females Athletes Award" from the Thailand Sports Authority.
2013 was Intanon's best year of her career. She reached the finals of the 2013 All England Open Badminton Championships, losing to Tine Rasmussen 14–21, 21–16, 10–21. She was the youngest ever singles finalist at the All England tournament. She lost in the final again by getting defeated from Wang Shixian in the 2013 Swiss Open Grand Prix Gold. She won her first Superseries tournament by beating Juliane Schenk 22–20, 21–14 in the 2013 Yonex Sunrise India Open 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 Open at the age of 16). She again reached the finals of the SCG Thailand Open 2013. This time she won the title, beating Busanan Ongbumrungpan 20–22, 21–19, 21–13 to become the first Thai ever to win the women's singles title at the Thailand Open since it was first held in 1984.
She withdrew from both the Indonesia Open SSP and Singapore Open SS to recover from her foot injury and prepare for the BWF World Championships. In World Championships in August, Intanon was seeded 4th. She reached the quarterfinals of this tournament for the first time, where she defeated Carolina Marín in a very hard-fought encounter. Her semifinal path was relatively easy, where she won against P. V. Sindhu in 2 games. In the final, she won the title, beating out world number 1 and Olympic gold medalist Li Xuerui 22–20, 18–21, 21–14 She was the first-ever Thai player to be the World Champion. At the age of 18, she was also the youngest singles World Champion ever. She became the World Champion while still being eligible to play in the 2013 BWF Junior World Championships in Bangkok. After the World Championships, she injured her back, which affected her performance and due to that, she failed to qualify for the 2013 BWF Super Series Finals and finished 2013 as the World number 3. She was awarded the "2013 Best Females Athletes Award" from the Thailand Sports Authority.
Ratchanok Intanon