Kantaphon Wangcharoen was a shock loss in the first round of the BWF Thailand Masters ©Getty Images

A couple of top seeds in the men's draw have already fallen at the first-round stage of the Badminton World Federation (BWF) Thailand Masters in Bangkok. 

Sixth seed Kantaphon Wangcharoen of Thailand was shocked by compatriot Suppanyu Avihingsanon at Indoor Stadium Huamark.

The 30-year-old lost the first game 21-18, but hit back to take the next two, 21-12, 21-14.

He now faces Khosit Phetpradab, also of Thailand, in the second round.

India's Srikanth Kidambi was the next big name to exit early, falling to Indonesia's Shesar Hiren Rhustavito in a thrilling encounter.

Fifth-seed Kidambi appeared to be in cruise control, taking the first game 21-12, but lost the next two 21-14, 21-11.

Japan's Koki Watanabe is next up for Rhustavito.

Akane Yamaguchi looks in great form ©Getty Images
Akane Yamaguchi looks in great form ©Getty Images

There were expected wins for Chinese second seed Shi Yuqi and third seed Angus Ng Ka Long of Hong Kong. 

In the women's competition, number one seed Akane Yamaguchi of Japan crushed Malaysian Goh Jin Wei 21-12, 21-8. 

At the other end of the draw, second seed Ratchankok Intanon of Thailand was too strong for qualifier Supanida Katethong - and will be hot favourite against Pai Yu-po in the second round. 

The game of the day was between South Korea's Sung Ji-hyun and Busanan Ongbamrungphan of Thailand. 

Sixth seed Sung was shocked in the first game, losing 26-24, but levelled things up 24-22. 

However, Ongbamrungphan pulled of a surprise win, edging the decider 21-18. 

She now meets unseeded Gregoria Mariska Tunjung of Indonesia. 

Action in Bangkok runs until Sunday (January 26).