Sindhu, the Olympic silver medallist, notched up a 21-18 21-15 win over world No. 13 Pornpawee Chochuwong in her third and final match.
While Srikanth lost 21-19, 9-21, 19-21 to Wang Tzu Wei of Chinese Taipei, Sindhu suffered an 18-21, 13-21 loss to Thailand's Ratchanok Intanon.
Sindhu and Srikanth fought their hearts out before suffering close defeats.
Saina is going through the toughest phase of her career and needs to take care of herself so as to avoid any more defeats, says the former national champion and coach.
Satwiksairaj Rankireddy and Ashwini Ponappa stunned world No. 6 pair of Peng Soon Chan and Liu Ying Goh of Malaysia in a nail-biting mixed doubles quarterfinal.
The world badminton champion took to Instagram to express her greetings.
The 25-year-old world badminton champion, who is part of the Target Olympic Podium Scheme core group, spoke to Malayala Manorama over the phone from London before heading for Thailand.
The world champion opens up on how she coped up with the COVID-19 induced lockdown, her reaction to the Tokyo Olympics postponement and her preparation for the upcoming Asia Cup.
In a lengthy post on her official Twitter handle, Sindhu said that the Denmark Open was the final straw and she has decided to bid adieu to the game.
Sindhu changed her original decision to pull out of the event due to personal reasons after Badminton Association of India President Himanta Biswa Sarma requested her to play.