The Indian seventh seed won the first game 21-11 but lost the next 17-21 before registering a 21-11 triumph in the final game to clinch the title.
The final lasted an hour and nine minutes. It was 21-year-old Sindhu’s maiden title. This win also was double World Championships bronze medallist Sindhu’s third in six games against Sun.
Sindhu looked on the offensive from the beginning and quickly raced to a 7-2 lead that became 11-6 at the mid-game interval.
Moving sharply within court, she showed her repertoire of strokes to bag five consecutive points that made it 17-7. She then comfortably won the first game 21-11.
Going by Sun’s performance in the first game, it seemed like Sindhu will seal the match in the second game. But it wasn’t to be.
Sindhu continued her strong game and led 11-7. But 2014 Asian Games champion Sun slowly upped her game and the home crowd did play a part in her revival.
She matched the Indian stroke for stroke and equalised at 14-all with the help of a six-point streak which also gave her the lead at 16-14. Then, Sindhu made it 17-all but Sun bagged the game by taking four straight points.
In the final game, the momentum shifted as Sindhu again went on an attacking spree. Her ability to play long rallies wore down Sun, who even though she fought hard till the six-point mark, Sun crumbled under pressure.
Sindhu then hardly looked back, rattling points one after another to sit at a 16-9 advantage. Thereafter, it was a cakewalk for the Indian.
Meanwhile, fourth seed Jan ‘O’ Jorgensen of Denmark shocked the home crowd when he defeated 2016 Olympic champion Chen Long of China 22-20, 21-13 in 46 minutes.
It was the Dane’s only second win in 10 encounters against two-time reigning world champion Long.
Denmark, however, missed out on the men’s doubles title as Mathias Boe and Carsten Mogensen lost to Indonesians Marcus Fernaldi Gideon and Kevin Sanjaya Sukamuljo 18-21, 20-22.
The women’s doubles title went to the South Korean pair of Lee So Hee and Chang Ye Na, who overcame Li Yinhui and Huang Dongping of China 13-21, 21-14, 21-17 in an hour and 30 minutes.
Yinhui lost in the mixed doubles final too. She and Zhang Na lost to Indoensians Tontowi Ahmad and Liliyana Natsir 13-21, 24-22, 21-16.