Saina Nehwal crossed the first hurdle comfortably but highlight of the day for the Indians came when Ajay Jayaram registered a stunning victory over world number seven Tien Minh Nguyen to sent him crashing out of Japan Super Series in straight-games in Tokyo.
Fourth seed Saina defeated Inthanon Ratchanok of Thailand 21-17 21-10 in a 31-minute women's singles match to set up a second round clash with Mingtian Fu of Singapore.
Commonwealth Games bronze medallist P Kashyap also reached the second round after notching up a 19-21, 21-14, 21-14 victory over Viktor Axelsen of Denmark in the men's singles competition.
However, it was Jayaram who stole the limelight with a stunning 21-18 21-19 triumph over Tien in a men's singles event that lasted 34 minutes at the Tokyo Metropolitan Gymnasium.
While Jayaram will be up against Indonesian Simon Santoso, Kashyap will next take on sixth seed Chinese Jin Chen.
India's top mixed-doubles pair of V Diju and Jwala Gutta too crossed the first hurdle, beating Shintaro Ikeda and Reiko Shiota 22-20 21-15 in a 34-minute contest.
World Championship bronze medallist, Jwala and Ashwini Ponnappa also didn't break much sweat as they dispatched Chinese Taipei's Hsin Yun Chang and Chia Wen Lai 21-8, 21-17 in just 20 minutes.
However, Rupesh Kumar and Sanave Thomas couldn't get past sixth seeds Markis Kido and Hendra Setiawan of Indonesia and suffered a 13-21 12-21 defeat in a match that lasted just 21 minutes.
World number five Saina didn't give any chance to her Thai opponent as she broke off from 4-all to pocket the first game.
Inthanon tried to come back in the second game and went neck-and-neck till 7-7 before Saina claimed seven straight points to create a huge gap, which the Thai shuttler failed to bridge.
However, the match that left the Indian camp mesmerized was Jayaram's victory.
In what turned out to be an even-knell contest, Jayaram and Tien fought tooth and nail for each and every point as they moved from 4-all to 13-13 before the Indian opened up a narrow 2-point lead and then widen the gap with four straight points to stun the Vietnamese.
Not one to take lying low, Tien came back strong in the second game but Jayaram once again surged ahead at 8-5 before the Vietnamese caught up with him at 11-all.
After moving neck-and-neck till 17-all, Jayaram moved ahead with bursts of two points to seal the match in his name.
