The fourth seed triumphed in an epic 91-minute final which saw him beat Denmark's Anders Antonsen 21-18, 24-26, 21-15.

Chou missed out on a match point in the second game and was forced to go the distance for the fourth match in a row at the Istora Gelora Bung Karno.

He took advantage of a draw which opened up after the second round when five seeded players were knocked out.

Unseeded Antonsen won the Indonesia Masters at the same venue in January, when he stunned Japan's world number one and world champion Kento Momota in the final, but he was unable to make it a double.

He had enjoyed a relatively smooth passage to the final with China's second seed Shi Yuqi withdrawing from their second round clash through injury after just 13 points had been contested.

No men's player from Chinese Taipei had won the event before Chou's success today.

In the women's singles, Japan's fourth seed Akane Yamaguchi claimed her biggest win on the circuit since last year's French Open.

She defeated PV Sindhu 21-15, 21-16 in the final to end a run of four straight defeats to the Indian.

Yamaguchi, who won World Championship bronze last year, proved too strong for a player who boasts silver medals from the Olympic Games, World Championships, Asian Games and Commonwealth Games.

"I was motivated to do well here after my Sudirman Cup loss," said Yamaguchi.

"I'm thankful to the fans here for cheering for me.

"I felt they were cheering louder for me than fans back home.

"This win is also important in the run-up to the Olympics. 

"All of us are working very hard and winning a tournament like this is important for confidence."

Sindhu had knocked out former world champion Nozomi Okuhara of Japan in the quarter-finals and then second seed Chen Yufei of China in the last four but found Yamaguchi a step too far.

In the doubles, the men's title went to home top seeds Marcus Fernaldi Gideon and Kevin Sanjaya Sukamuljo who won an all-Indonesian clash against fourth seeds Mohammad Ahsan and Hendra Setiawan, 21-19, 21-16.

An all-Japanese final in the women's doubles was won by second seeds Yuki Fukushima and Sayaka Hirota over second seeds Misaki Matsutomo and Ayaka Takahashi, 21-16, 21-18.

China's mixed doubles top seeds Zheng Siwei and Huang Yaqiong also beat compatriots to seal glory, seeing off second seeds Wang Yilü and Huang Dongping 21-13, 21-18.

The event is one of the most prestigious in the sport with Super 1000 the top tier of the World Tour.