Sindhu, who had come into the event having won the Malaysian Masters title, looked on course for a third round berth when she took the opening game 21-18.

The Indian seemingly eased back, however, and allowed her unseeded opponent back into the match as Jindapon squared proceedings by claiming a marathon second game 26-24.

That sent the contest into a decider and the momentum was with Jindapon, who completed a surprise comeback victory thanks to a 21-17 scoreline in her favour.

Sindhu’s compatriots Parupalli Kashyap, the men’s defending champion, and top seed Kidambi Srikanth managed to fare better as both progressed to round three with comfortable wins.

Kashyap, winner of last year’s Badminton World Federation Grand Prix Gold event by overcoming Srikanth and who is seeded fourth this time, secured a 21-19, 21-10 success in his match with 48th ranked Zhu Siyuan of China.

Srikanth was in equally impressive form, dispatching Malaysia’s Iskandar Zulkarnain Zainuddin 21-19, 21-12 in just 32 minutes to ensure he moved into the next round in style.

Women’s singles second seed Sung Ji-hyun is also safely through after she easily beat Indonesia’s Hanna Ramadini 21-14, 21-10.

There was also a surprise result in the men’s doubles as 2014 world champions Ko Sung-hyun and Shin Baek-cheol of South Korea exited the tournament, suffering a 21-14, 14-21, 24-22 loss at the hands of Vietnamese outsiders V Shem Goh and Wee Kiong Tan.

Danish top seeds Mathias Boe and Carsten Mogensen had no such troubles, breezing to a 21-7, 21-12 win against India's Vineeth Manuel and Shanmughasuns Sanjeeth.

South Korean duo Chang Ye-na and Lee So-hee,  top seeds in the women’s doubles competition, also looked in good form as they progressed by beating German pair Johanna Goliszewski and Carla Nelte.